CVE-2025-47950 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2025-47950 Interim 1 6 2026-03-05T00:33:01Z current 2025-06-10T23:12:46Z 2026-03-05T00:33:01Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2025-47950 CoreDNS is a DNS server that chains plugins. In versions prior to 1.12.2, a Denial of Service (DoS) vulnerability exists in the CoreDNS DNS-over-QUIC (DoQ) server implementation. The server previously created a new goroutine for every incoming QUIC stream without imposing any limits on the number of concurrent streams or goroutines. A remote, unauthenticated attacker could open a large number of streams, leading to uncontrolled memory consumption and eventually causing an Out Of Memory (OOM) crash - especially in containerized or memory-constrained environments. The patch in version 1.12.2 introduces two key mitigation mechanisms: `max_streams`, which caps the number of concurrent QUIC streams per connection with a default value of `256`; and `worker_pool_size`, which Introduces a server-wide, bounded worker pool to process incoming streams with a default value of `1024`. This eliminates the 1:1 stream-to-goroutine model and ensures that CoreDNS remains resilient under high concurrency. Some workarounds are available for those who are unable to upgrade. Disable QUIC support by removing or commenting out the `quic://` block in the Corefile, use container runtime resource limits to detect and isolate excessive memory usage, and/or monitor QUIC connection patterns and alert on anomalies. 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 Container suse/sl-micro/6.0/baremetal-os-container:latest Image SLE-Micro-Azure Image SLE-Micro-BYOS-Azure SUSE Linux Enterprise Server 16.0 openSUSE Tumbleweed govulncheck-vulndb-0.0.20250612T141001-1.1 govulncheck-vulndb-0.0.20250814T182633-160000.1.2 kernel-firmware-all-20241128-slfo.1.1_2.1 kernel-firmware-amdgpu-20241128-slfo.1.1_2.1 kernel-firmware-ath10k-20241128-slfo.1.1_2.1 kernel-firmware-ath11k-20241128-slfo.1.1_2.1 kernel-firmware-ath12k-20241128-slfo.1.1_2.1 kernel-firmware-atheros-20241128-slfo.1.1_2.1 kernel-firmware-bluetooth-20241128-slfo.1.1_2.1 kernel-firmware-bnx2-20241128-slfo.1.1_2.1 kernel-firmware-brcm-20241128-slfo.1.1_2.1 kernel-firmware-chelsio-20241128-slfo.1.1_2.1 kernel-firmware-dpaa2-20241128-slfo.1.1_2.1 kernel-firmware-i915-20241128-slfo.1.1_2.1 kernel-firmware-intel-20241128-slfo.1.1_2.1 kernel-firmware-iwlwifi-20241128-slfo.1.1_2.1 kernel-firmware-liquidio-20241128-slfo.1.1_2.1 kernel-firmware-marvell-20241128-slfo.1.1_2.1 kernel-firmware-media-20241128-slfo.1.1_2.1 kernel-firmware-mediatek-20241128-slfo.1.1_2.1 kernel-firmware-mellanox-20241128-slfo.1.1_2.1 kernel-firmware-mwifiex-20241128-slfo.1.1_2.1 kernel-firmware-network-20241128-slfo.1.1_2.1 kernel-firmware-nfp-20241128-slfo.1.1_2.1 kernel-firmware-nvidia-20241128-slfo.1.1_2.1 kernel-firmware-platform-20241128-slfo.1.1_2.1 kernel-firmware-prestera-20241128-slfo.1.1_2.1 kernel-firmware-qcom-20241128-slfo.1.1_2.1 kernel-firmware-qlogic-20241128-slfo.1.1_2.1 kernel-firmware-radeon-20241128-slfo.1.1_2.1 kernel-firmware-realtek-20241128-slfo.1.1_2.1 kernel-firmware-serial-20241128-slfo.1.1_2.1 kernel-firmware-sound-20241128-slfo.1.1_2.1 kernel-firmware-ti-20241128-slfo.1.1_2.1 kernel-firmware-ueagle-20241128-slfo.1.1_2.1 kernel-firmware-usb-network-20241128-slfo.1.1_2.1 python311-dnspython-2.4.2-2.1 kernel-firmware-all-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-amdgpu-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-ath10k-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-ath11k-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-ath12k-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-atheros-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-bluetooth-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-bnx2-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-brcm-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-chelsio-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-dpaa2-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-i915-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-intel-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-iwlwifi-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-liquidio-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-marvell-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-media-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-mediatek-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-mellanox-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-mwifiex-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-network-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-nfp-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-nvidia-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-platform-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-prestera-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-qcom-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-qlogic-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-radeon-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-realtek-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-serial-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-sound-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-ti-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-ueagle-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest kernel-firmware-usb-network-20241128-slfo.1.1_2.1 as a component of Container suse/sl-micro/6.0/baremetal-os-container:latest python311-dnspython-2.4.2-2.1 as a component of Image SLE-Micro-Azure python311-dnspython-2.4.2-2.1 as a component of Image SLE-Micro-BYOS-Azure govulncheck-vulndb-0.0.20250814T182633-160000.1.2 as a component of SUSE Linux Enterprise Server 16.0 govulncheck-vulndb-0.0.20250612T141001-1.1 as a component of openSUSE Tumbleweed CoreDNS is a DNS server that chains plugins. In versions prior to 1.12.2, a Denial of Service (DoS) vulnerability exists in the CoreDNS DNS-over-QUIC (DoQ) server implementation. The server previously created a new goroutine for every incoming QUIC stream without imposing any limits on the number of concurrent streams or goroutines. A remote, unauthenticated attacker could open a large number of streams, leading to uncontrolled memory consumption and eventually causing an Out Of Memory (OOM) crash - especially in containerized or memory-constrained environments. The patch in version 1.12.2 introduces two key mitigation mechanisms: `max_streams`, which caps the number of concurrent QUIC streams per connection with a default value of `256`; and `worker_pool_size`, which Introduces a server-wide, bounded worker pool to process incoming streams with a default value of `1024`. This eliminates the 1:1 stream-to-goroutine model and ensures that CoreDNS remains resilient under high concurrency. Some workarounds are available for those who are unable to upgrade. Disable QUIC support by removing or commenting out the `quic://` block in the Corefile, use container runtime resource limits to detect and isolate excessive memory usage, and/or monitor QUIC connection patterns and alert on anomalies. CVE-2025-47950 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-all-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-amdgpu-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-ath10k-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-ath11k-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-ath12k-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-atheros-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-bluetooth-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-bnx2-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-brcm-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-chelsio-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-dpaa2-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-i915-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-intel-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-iwlwifi-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-liquidio-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-marvell-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-media-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-mediatek-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-mellanox-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-mwifiex-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-network-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-nfp-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-nvidia-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-platform-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-prestera-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-qcom-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-qlogic-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-radeon-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-realtek-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-serial-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-sound-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-ti-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-ueagle-20241128-slfo.1.1_2.1 Container suse/sl-micro/6.0/baremetal-os-container:latest:kernel-firmware-usb-network-20241128-slfo.1.1_2.1 Image SLE-Micro-Azure:python311-dnspython-2.4.2-2.1 Image SLE-Micro-BYOS-Azure:python311-dnspython-2.4.2-2.1 SUSE Linux Enterprise Server 16.0:govulncheck-vulndb-0.0.20250814T182633-160000.1.2 openSUSE Tumbleweed:govulncheck-vulndb-0.0.20250612T141001-1.1 moderate 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L