CVE-2026-53269

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/0ec9ddc1bda261a2c57636c74c8b4e53000102c9 ↗

Additional information

• NVD record
• 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