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CVE-2026-53269

netfilter: synproxy: add mutex to guard hook reference counting

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
None on Exploit-DB, Metasploit or GitHub

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From ad49d86e07a497e834cb06f2b151dccd75f8e148 · fixed in 0ec9ddc1bda261a2c57636c74c8b4e53000102c9; From ad49d86e07a497e834cb06f2b151dccd75f8e148 · fixed in 56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389; From ad49d86e07a497e834cb06f2b151dccd75f8e148 · fixed in debc57b83d5b323df74bf010c8d50fe26ad2ed6b; From ad49d86e07a497e834cb06f2b151dccd75f8e148 · fixed in 0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88; From ad49d86e07a497e834cb06f2b151dccd75f8e148 · fixed in 640441348258220e78daed40528b85b8afcedab6; From ad49d86e07a497e834cb06f2b151dccd75f8e148 · fixed in aaf80701dc2f7a48fe543961e21f8ca3924d587c; From ad49d86e07a497e834cb06f2b151dccd75f8e148 · fixed in fbf0591275f50eae5733c3d7a8cd6c1e79933ffa; From ad49d86e07a497e834cb06f2b151dccd75f8e148 · fixed in 2fcba19caaeb2a33017459d3430f057967bb91b6

  • Linux Linux

    5.3

  • KernelLinux

    From 5.3.0 · fixed in 5.10.259; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.94; From 6.13.0 · fixed in 6.18.36; From 6.19.0 · fixed in 7.0.13

References 8

git.kernel.org