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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxad49d86e07a497e834cb06f2b151dccd75f8e148 < 0ec9ddc1bda261a2c57636c74c8b4e53000102c9affected
LinuxLinuxad49d86e07a497e834cb06f2b151dccd75f8e148 < 56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389affected
LinuxLinuxad49d86e07a497e834cb06f2b151dccd75f8e148 < debc57b83d5b323df74bf010c8d50fe26ad2ed6baffected
LinuxLinuxad49d86e07a497e834cb06f2b151dccd75f8e148 < 0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88affected
LinuxLinuxad49d86e07a497e834cb06f2b151dccd75f8e148 < 640441348258220e78daed40528b85b8afcedab6affected
LinuxLinuxad49d86e07a497e834cb06f2b151dccd75f8e148 < aaf80701dc2f7a48fe543961e21f8ca3924d587caffected
LinuxLinuxad49d86e07a497e834cb06f2b151dccd75f8e148 < fbf0591275f50eae5733c3d7a8cd6c1e79933ffaaffected
LinuxLinuxad49d86e07a497e834cb06f2b151dccd75f8e148 < 2fcba19caaeb2a33017459d3430f057967bb91b6affected
LinuxLinux5.3affected
LinuxLinux0 < 5.3unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.94 <= 6.12.*unaffected
LinuxLinux6.18.36 <= 6.18.*unaffected
LinuxLinux7.0.13 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References