CVE-2026-53269
In the Linux kernel, the following vulnerability has been resolved: netfilter: synproxy: add mutex to guard hook reference counting As the synproxy infrastructure register netfilter hooks on-demand when a user adds the first iptables target or nftables…
Does this matter?
Lower severity and a low EPSS score (0.17%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: synproxy: add mutex to guard hook reference counting As the synproxy infrastructure register netfilter hooks on-demand when a user adds the first iptables target or nftables expression, if done concurrently they can race each other. Introduce a mutex to serialize the refcount control blocks access from both frontends. While a per namespace mutex might be more efficient, it is not needed for target/expression like SYNPROXY.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.17% probability · 6th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0ec9ddc1bda261a2c57636c74c8b4e53000102c9Patch
- https://git.kernel.org/stable/c/0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88Patch
- https://git.kernel.org/stable/c/2fcba19caaeb2a33017459d3430f057967bb91b6Patch
- https://git.kernel.org/stable/c/56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389Patch
- https://git.kernel.org/stable/c/640441348258220e78daed40528b85b8afcedab6Patch
- https://git.kernel.org/stable/c/aaf80701dc2f7a48fe543961e21f8ca3924d587cPatch
- https://git.kernel.org/stable/c/debc57b83d5b323df74bf010c8d50fe26ad2ed6bPatch
- https://git.kernel.org/stable/c/fbf0591275f50eae5733c3d7a8cd6c1e79933ffaPatch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.