CVE-2022-50335 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2022-50335 Interim 1 2 2026-03-05T04:08:14Z current 2025-10-05T00:52:58Z 2026-03-05T04:08:14Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2022-50335 In the Linux kernel, the following vulnerability has been resolved: 9p: set req refcount to zero to avoid uninitialized usage When a new request is allocated, the refcount will be zero if it is reused, but if the request is newly allocated from slab, it is not fully initialized before being added to idr. If the p9_read_work got a response before the refcount initiated. It will use a uninitialized req, which will result in a bad request data struct. Here is the logs from syzbot. Corrupted memory at 0xffff88807eade00b [ 0xff 0x07 0x00 0x00 0x00 0x00 0x00 0x00 . . . . . . . . ] (in kfence-#110): p9_fcall_fini net/9p/client.c:248 [inline] p9_req_put net/9p/client.c:396 [inline] p9_req_put+0x208/0x250 net/9p/client.c:390 p9_client_walk+0x247/0x540 net/9p/client.c:1165 clone_fid fs/9p/fid.h:21 [inline] v9fs_fid_xattr_set+0xe4/0x2b0 fs/9p/xattr.c:118 v9fs_xattr_set fs/9p/xattr.c:100 [inline] v9fs_xattr_handler_set+0x6f/0x120 fs/9p/xattr.c:159 __vfs_setxattr+0x119/0x180 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5f0 fs/xattr.c:216 __vfs_setxattr_locked+0x1d3/0x260 fs/xattr.c:277 vfs_setxattr+0x143/0x340 fs/xattr.c:309 setxattr+0x146/0x160 fs/xattr.c:617 path_setxattr+0x197/0x1c0 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __ia32_sys_setxattr+0xc0/0x160 fs/xattr.c:648 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Below is a similar scenario, the scenario in the syzbot log looks more complicated than this one, but this patch can fix it. T21124 p9_read_work ======================== second trans ================================= p9_client_walk p9_client_rpc p9_client_prepare_req p9_tag_alloc req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); tag = idr_alloc << preempted >> req->tc.tag = tag; /* req->[refcount/tag] == uninitialized */ m->rreq = p9_tag_lookup(m->client, m->rc.tag); /* increments uninitalized refcount */ refcount_set(&req->refcount, 2); /* cb drops one ref */ p9_client_cb(req) /* reader thread drops its ref: request is incorrectly freed */ p9_req_put(req) /* use after free and ref underflow */ p9_req_put(req) To fix it, we can initialize the refcount to zero before add to idr. The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). https://www.suse.com/support/security/rating/ SUSE Security Ratings SLES-LTSS-TERADATA 15 SP2 SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Development Tools 15 SP6 SUSE Linux Enterprise Workstation Extension 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Development Tools 15 SP7 SUSE Linux Enterprise Workstation Extension 15 SP7 SUSE Linux Enterprise High Availability Extension 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Development Tools 15 SP6 SUSE Linux Enterprise Module for Legacy 15 SP6 SUSE Linux Enterprise Module for Public Cloud 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Development Tools 15 SP7 SUSE Linux Enterprise Module for Legacy 15 SP7 SUSE Linux Enterprise Module for Public Cloud 15 SP7 SUSE Linux Enterprise Live Patching 12 SP5 SUSE Linux Enterprise Live Patching 15 SP3 SUSE Linux Enterprise Live Patching 15 SP4 SUSE Linux Enterprise Live Patching 15 SP5 SUSE Linux Enterprise Live Patching 15 SP6 SUSE Linux Enterprise Live Patching 15 SP7 SUSE Linux Enterprise Micro 5.0 SUSE Linux Enterprise Micro 5.1 SUSE Linux Enterprise Micro 5.2 SUSE Linux Enterprise Micro 5.3 SUSE Linux Enterprise Micro 5.4 SUSE Linux Enterprise Micro 5.5 SUSE Real Time Module 15 SP6 SUSE Real Time Module 15 SP7 SUSE Linux Enterprise Server 11 SP4 LTSS SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE SUSE Linux Enterprise Server 12 SP2-LTSS SUSE Linux Enterprise Server 12 SP4-LTSS SUSE Linux Enterprise Server 12 SP5-LTSS SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security SUSE Linux Enterprise Server 15 SP1-LTSS SUSE Linux Enterprise Server 15 SP2-LTSS SUSE Linux Enterprise Server 15 SP3-LTSS SUSE Linux Enterprise Server 15 SP4-LTSS SUSE Linux Enterprise Server 15 SP5-LTSS SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Development Tools 15 SP6 SUSE Linux Enterprise Module for Legacy 15 SP6 SUSE Linux Enterprise Module for Public Cloud 15 SP6 SUSE Linux Enterprise Workstation Extension 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Development Tools 15 SP7 SUSE Linux Enterprise Module for Legacy 15 SP7 SUSE Linux Enterprise Module for Public Cloud 15 SP7 SUSE Linux Enterprise Workstation Extension 15 SP7 SUSE Linux Enterprise Server 15-LTSS SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server Teradata 12 SP3 SUSE Linux Enterprise Server Teradata 15 SP4 SUSE Linux Enterprise Server for SAP Applications 15 SP3 SUSE Linux Enterprise Server for SAP Applications 15 SP4 SUSE Linux Enterprise Server for SAP Applications 15 SP5 SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Development Tools 15 SP6 SUSE Linux Enterprise Module for Legacy 15 SP6 SUSE Linux Enterprise Module for Public Cloud 15 SP6 SUSE Linux Enterprise Workstation Extension 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Development Tools 15 SP7 SUSE Linux Enterprise Module for Legacy 15 SP7 SUSE Linux Enterprise Module for Public Cloud 15 SP7 SUSE Linux Enterprise Workstation Extension 15 SP7 SUSE Linux Micro 6.0 SUSE Linux Micro 6.1 SUSE Manager Proxy LTS 4.3 SUSE Manager Retail Branch Server LTS 4.3 SUSE Manager Server LTS 4.3 openSUSE Leap 15.6 cluster-md-kmp-default dlm-kmp-default gfs2-kmp-default kernel-default kernel-default-base kernel-default-devel kernel-default-extra kernel-default-kgraft kernel-default-kgraft-devel kernel-default-livepatch kernel-default-livepatch-devel kernel-default-man kernel-default-optional kernel-default-vdso kernel-devel kernel-devel-azure kernel-devel-rt kernel-macros kernel-rt kernel-source kernel-source-azure kernel-source-rt kernel-source-vanilla kselftests-kmp-default ocfs2-kmp-default reiserfs-kmp-default kernel-default as a component of SLES-LTSS-TERADATA 15 SP2 kernel-source as a component of SLES-LTSS-TERADATA 15 SP2 cluster-md-kmp-default as a component of SUSE Linux Enterprise High Availability Extension 15 SP7 dlm-kmp-default as a component of SUSE Linux Enterprise High Availability Extension 15 SP7 gfs2-kmp-default as a component of SUSE Linux Enterprise High Availability Extension 15 SP7 ocfs2-kmp-default as a component of SUSE Linux Enterprise High Availability Extension 15 SP7 kernel-default as a component of SUSE Linux Enterprise High Availability Extension 15 SP7 kernel-source as a component of SUSE Linux Enterprise High Availability Extension 15 SP7 kernel-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-default-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-macros as a component of SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-source as a component of SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-default-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-macros as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-source as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS cluster-md-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS dlm-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS gfs2-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS kernel-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS kernel-default-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS ocfs2-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS kernel-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS kernel-macros as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS kernel-source as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS cluster-md-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS dlm-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS gfs2-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-default-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS ocfs2-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-macros as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-source as a component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-default-kgraft as a component of SUSE Linux Enterprise Live Patching 12 SP5 kernel-default-kgraft-devel as a component of SUSE Linux Enterprise Live Patching 12 SP5 kernel-default as a component of SUSE Linux Enterprise Live Patching 12 SP5 kernel-source as a component of SUSE Linux Enterprise Live Patching 12 SP5 kernel-default-livepatch as a component of SUSE Linux Enterprise Live Patching 15 SP3 kernel-default-livepatch-devel as a component of SUSE Linux Enterprise Live Patching 15 SP3 kernel-default as a component of SUSE Linux Enterprise Live Patching 15 SP3 kernel-source as a component of SUSE Linux Enterprise Live Patching 15 SP3 kernel-default-livepatch as a component of SUSE Linux Enterprise Live Patching 15 SP4 kernel-default-livepatch-devel as a component of SUSE Linux Enterprise Live Patching 15 SP4 kernel-default as a component of SUSE Linux Enterprise Live Patching 15 SP4 kernel-source as a component of SUSE Linux Enterprise Live Patching 15 SP4 kernel-default-livepatch as a component of SUSE Linux Enterprise Live Patching 15 SP5 kernel-default-livepatch-devel as a component of SUSE Linux Enterprise Live Patching 15 SP5 kernel-default as a component of SUSE Linux Enterprise Live Patching 15 SP5 kernel-source as a component of SUSE Linux Enterprise Live Patching 15 SP5 kernel-default-livepatch as a component of SUSE Linux Enterprise Live Patching 15 SP6 kernel-default-livepatch-devel as a component of SUSE Linux Enterprise Live Patching 15 SP6 kernel-default as a component of SUSE Linux Enterprise Live Patching 15 SP6 kernel-source as a component of SUSE Linux Enterprise Live Patching 15 SP6 kernel-default-livepatch as a component of SUSE Linux Enterprise Live Patching 15 SP7 kernel-default-livepatch-devel as a component of SUSE Linux Enterprise Live Patching 15 SP7 kernel-default as a component of SUSE Linux Enterprise Live Patching 15 SP7 kernel-source as a component of SUSE Linux Enterprise Live Patching 15 SP7 kernel-default as a component of SUSE Linux Enterprise Micro 5.0 kernel-default as a component of SUSE Linux Enterprise Micro 5.1 kernel-rt as a component of 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for Basesystem 15 SP7 kernel-source as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-default as a component of SUSE Linux Enterprise Module for Development Tools 15 SP6 kernel-source as a component of SUSE Linux Enterprise Module for Development Tools 15 SP6 kernel-default as a component of SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-source as a component of SUSE Linux Enterprise Module for Development Tools 15 SP7 reiserfs-kmp-default as a component of SUSE Linux Enterprise Module for Legacy 15 SP6 kernel-default as a component of SUSE Linux Enterprise Module for Legacy 15 SP6 kernel-source as a component of SUSE Linux Enterprise Module for Legacy 15 SP6 reiserfs-kmp-default as a component of SUSE Linux Enterprise Module for Legacy 15 SP7 kernel-default as a component of SUSE Linux Enterprise Module for Legacy 15 SP7 kernel-source as a component of SUSE Linux Enterprise Module for Legacy 15 SP7 kernel-devel-azure as a component of SUSE Linux Enterprise Module for Public Cloud 15 SP6 kernel-source-azure as a component of SUSE Linux Enterprise Module for Public Cloud 15 SP6 kernel-devel-azure as a component of SUSE Linux Enterprise Module for Public Cloud 15 SP7 kernel-source-azure as a component of SUSE Linux Enterprise Module for Public Cloud 15 SP7 kernel-default as a component of SUSE Linux Enterprise Server 11 SP4 LTSS kernel-source as a component of SUSE Linux Enterprise Server 11 SP4 LTSS kernel-default as a component of SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-default-base as a component of SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-default-devel as a component of SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-source as a component of SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-default as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-default-base as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-default-man as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-source as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-default as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-default-base as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-default-man as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-source as a component of SUSE Linux Enterprise Server 12 SP4-LTSS cluster-md-kmp-default as a component of SUSE Linux Enterprise Server 12 SP5-LTSS dlm-kmp-default as a component of SUSE Linux Enterprise Server 12 SP5-LTSS gfs2-kmp-default as a component of SUSE Linux Enterprise Server 12 SP5-LTSS kernel-default as a component of SUSE Linux Enterprise Server 12 SP5-LTSS kernel-default-base as a component of SUSE Linux Enterprise Server 12 SP5-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 12 SP5-LTSS kernel-default-man as a component of SUSE Linux Enterprise Server 12 SP5-LTSS ocfs2-kmp-default as a component of SUSE Linux Enterprise Server 12 SP5-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 12 SP5-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 12 SP5-LTSS kernel-source as a component of SUSE Linux Enterprise Server 12 SP5-LTSS kernel-default as a component of SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security kernel-source as a component of SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security kernel-default as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default-base as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default-man as a component of SUSE Linux Enterprise Server 15 SP1-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default as a component of SUSE Linux Enterprise Server 15 SP2-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15 SP2-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15 SP2-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15 SP2-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP2-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP2-LTSS kernel-default as a component of SUSE Linux Enterprise Server 15 SP3-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15 SP3-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15 SP3-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15 SP3-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP3-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP3-LTSS kernel-default as a component of SUSE Linux Enterprise Server 15 SP4-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15 SP4-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15 SP4-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15 SP4-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP4-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP4-LTSS cluster-md-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS dlm-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS gfs2-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15 SP5-LTSS ocfs2-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-default as a component of SUSE Linux Enterprise Server 15-LTSS kernel-default-base as a component of SUSE Linux Enterprise Server 15-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15-LTSS kernel-default-man as a component of SUSE Linux Enterprise Server 15-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15-LTSS kernel-default as a component of SUSE Linux Enterprise Server 16.0 kernel-devel as a component of SUSE Linux Enterprise Server 16.0 kernel-macros as a component of SUSE Linux Enterprise Server 16.0 kernel-source as a component of SUSE Linux Enterprise Server 16.0 kernel-source-vanilla as a component of SUSE Linux Enterprise Server 16.0 kernel-devel-azure as a component of SUSE Linux Enterprise Server 16.0 kernel-source-azure as a component of SUSE Linux Enterprise Server 16.0 kernel-default as a component of SUSE Linux Enterprise Server Teradata 12 SP3 kernel-source as a component of SUSE Linux Enterprise Server Teradata 12 SP3 kernel-default as a component of SUSE Linux Enterprise Server Teradata 15 SP4 kernel-source as a component of SUSE Linux Enterprise Server Teradata 15 SP4 kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-default-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP3 reiserfs-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-macros as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-default-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 reiserfs-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-macros as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 cluster-md-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 dlm-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 gfs2-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 ocfs2-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 reiserfs-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-macros as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default-extra as a component of SUSE Linux Enterprise Workstation Extension 15 SP6 kernel-default as a component of SUSE Linux Enterprise Workstation Extension 15 SP6 kernel-source as a component of SUSE Linux Enterprise Workstation Extension 15 SP6 kernel-default-extra as a component of SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-default as a component of SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-source as a component of SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-default as a component of SUSE Linux Micro 6.0 kernel-devel as a component of SUSE Linux Micro 6.0 kernel-macros as a component of SUSE Linux Micro 6.0 kernel-source as a component of SUSE Linux Micro 6.0 kernel-devel-rt as a component of SUSE Linux Micro 6.0 kernel-source-rt as a component of SUSE Linux Micro 6.0 kernel-default as a component of SUSE Linux Micro 6.1 kernel-devel as a component of SUSE Linux Micro 6.1 kernel-macros as a component of SUSE Linux Micro 6.1 kernel-source as a component of SUSE Linux Micro 6.1 kernel-devel-rt as a component of SUSE Linux Micro 6.1 kernel-source-rt as a component of SUSE Linux Micro 6.1 kernel-default as a component of SUSE Manager Proxy LTS 4.3 kernel-default-devel as a component of SUSE Manager Proxy LTS 4.3 kernel-devel as a component of SUSE Manager Proxy LTS 4.3 kernel-macros as a component of SUSE Manager Proxy LTS 4.3 kernel-source as a component of SUSE Manager Proxy LTS 4.3 kernel-default as a component of SUSE Manager Retail Branch Server LTS 4.3 kernel-default-devel as a component of SUSE Manager Retail Branch Server LTS 4.3 kernel-devel as a component of SUSE Manager Retail Branch Server LTS 4.3 kernel-macros as a component of SUSE Manager Retail Branch Server LTS 4.3 kernel-source as a component of SUSE Manager Retail Branch Server LTS 4.3 kernel-default as a component of SUSE Manager Server LTS 4.3 kernel-default-devel as a component of SUSE Manager Server LTS 4.3 kernel-devel as a component of SUSE Manager Server LTS 4.3 kernel-macros as a component of SUSE Manager Server LTS 4.3 kernel-source as a component of SUSE Manager Server LTS 4.3 kernel-devel-rt as a component of SUSE Real Time Module 15 SP6 kernel-source-rt as a component of SUSE Real Time Module 15 SP6 kernel-devel-rt as a component of SUSE Real Time Module 15 SP7 kernel-source-rt as a component of SUSE Real Time Module 15 SP7 cluster-md-kmp-default as a component of openSUSE Leap 15.6 dlm-kmp-default as a component of openSUSE Leap 15.6 gfs2-kmp-default as a component of openSUSE Leap 15.6 kernel-default as a component of openSUSE Leap 15.6 kernel-default-devel as a component of openSUSE Leap 15.6 kernel-default-extra as a component of openSUSE Leap 15.6 kernel-default-livepatch as a component of openSUSE Leap 15.6 kernel-default-livepatch-devel as a component of openSUSE Leap 15.6 kernel-default-optional as a component of openSUSE Leap 15.6 kernel-default-vdso as a component of openSUSE Leap 15.6 kselftests-kmp-default as a component of openSUSE Leap 15.6 ocfs2-kmp-default as a component of openSUSE Leap 15.6 reiserfs-kmp-default as a component of openSUSE Leap 15.6 kernel-devel as a component of openSUSE Leap 15.6 kernel-macros as a component of openSUSE Leap 15.6 kernel-source as a component of openSUSE Leap 15.6 kernel-source-vanilla as a component of openSUSE Leap 15.6 kernel-devel-azure as a component of openSUSE Leap 15.6 kernel-source-azure as a component of openSUSE Leap 15.6 kernel-devel-rt as a component of openSUSE Leap 15.6 kernel-source-rt as a component of openSUSE Leap 15.6 In the Linux kernel, the following vulnerability has been resolved: 9p: set req refcount to zero to avoid uninitialized usage When a new request is allocated, the refcount will be zero if it is reused, but if the request is newly allocated from slab, it is not fully initialized before being added to idr. If the p9_read_work got a response before the refcount initiated. It will use a uninitialized req, which will result in a bad request data struct. Here is the logs from syzbot. Corrupted memory at 0xffff88807eade00b [ 0xff 0x07 0x00 0x00 0x00 0x00 0x00 0x00 . . . . . . . . ] (in kfence-#110): p9_fcall_fini net/9p/client.c:248 [inline] p9_req_put net/9p/client.c:396 [inline] p9_req_put+0x208/0x250 net/9p/client.c:390 p9_client_walk+0x247/0x540 net/9p/client.c:1165 clone_fid fs/9p/fid.h:21 [inline] v9fs_fid_xattr_set+0xe4/0x2b0 fs/9p/xattr.c:118 v9fs_xattr_set fs/9p/xattr.c:100 [inline] v9fs_xattr_handler_set+0x6f/0x120 fs/9p/xattr.c:159 __vfs_setxattr+0x119/0x180 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5f0 fs/xattr.c:216 __vfs_setxattr_locked+0x1d3/0x260 fs/xattr.c:277 vfs_setxattr+0x143/0x340 fs/xattr.c:309 setxattr+0x146/0x160 fs/xattr.c:617 path_setxattr+0x197/0x1c0 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __ia32_sys_setxattr+0xc0/0x160 fs/xattr.c:648 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Below is a similar scenario, the scenario in the syzbot log looks more complicated than this one, but this patch can fix it. T21124 p9_read_work ======================== second trans ================================= p9_client_walk p9_client_rpc p9_client_prepare_req p9_tag_alloc req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); tag = idr_alloc << preempted >> req->tc.tag = tag; /* req->[refcount/tag] == uninitialized */ m->rreq = p9_tag_lookup(m->client, m->rc.tag); /* increments uninitalized refcount */ refcount_set(&req->refcount, 2); /* cb drops one ref */ p9_client_cb(req) /* reader thread drops its ref: request is incorrectly freed */ p9_req_put(req) /* use after free and ref underflow */ p9_req_put(req) To fix it, we can initialize the refcount to zero before add to idr. CVE-2022-50335 SUSE Linux Enterprise High Availability Extension 15 SP7:cluster-md-kmp-default SUSE Linux Enterprise High Availability Extension 15 SP7:dlm-kmp-default SUSE Linux Enterprise High Availability Extension 15 SP7:gfs2-kmp-default SUSE Linux Enterprise High Availability Extension 15 SP7:kernel-default SUSE Linux Enterprise High Availability Extension 15 SP7:kernel-source SUSE Linux Enterprise High Availability Extension 15 SP7:ocfs2-kmp-default SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:cluster-md-kmp-default SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:dlm-kmp-default SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:gfs2-kmp-default SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:kernel-default SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:kernel-default-devel SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:kernel-devel SUSE Linux Enterprise High Performance Computing 15 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