CVE-2026-53269
netfilter: synproxy: add mutex to guard hook reference counting
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jun 25, 2026 |
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Affected Versions
Linux / Linux
ad49d86e07a497e834cb06f2b151dccd75f8e148 < 0ec9ddc1bda261a2c57636c74c8b4e53000102c9 ad49d86e07a497e834cb06f2b151dccd75f8e148 < 56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389 ad49d86e07a497e834cb06f2b151dccd75f8e148 < debc57b83d5b323df74bf010c8d50fe26ad2ed6b ad49d86e07a497e834cb06f2b151dccd75f8e148 < 0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88 ad49d86e07a497e834cb06f2b151dccd75f8e148 < 640441348258220e78daed40528b85b8afcedab6 ad49d86e07a497e834cb06f2b151dccd75f8e148 < aaf80701dc2f7a48fe543961e21f8ca3924d587c ad49d86e07a497e834cb06f2b151dccd75f8e148 < fbf0591275f50eae5733c3d7a8cd6c1e79933ffa ad49d86e07a497e834cb06f2b151dccd75f8e148 < 2fcba19caaeb2a33017459d3430f057967bb91b6
Linux / Linux
5.3
References
git.kernel.org: https://git.kernel.org/stable/c/0ec9ddc1bda261a2c57636c74c8b4e53000102c9 git.kernel.org: https://git.kernel.org/stable/c/56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389 git.kernel.org: https://git.kernel.org/stable/c/debc57b83d5b323df74bf010c8d50fe26ad2ed6b git.kernel.org: https://git.kernel.org/stable/c/0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88 git.kernel.org: https://git.kernel.org/stable/c/640441348258220e78daed40528b85b8afcedab6 git.kernel.org: https://git.kernel.org/stable/c/aaf80701dc2f7a48fe543961e21f8ca3924d587c git.kernel.org: https://git.kernel.org/stable/c/fbf0591275f50eae5733c3d7a8cd6c1e79933ffa git.kernel.org: https://git.kernel.org/stable/c/2fcba19caaeb2a33017459d3430f057967bb91b6