CVE-2026-53269

MediumCVSS 5.5/10Last modified Nov 10, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected software

VendorProductVersions
LinuxLinux>= ad49d86e07a497e834cb06f2b151dccd75f8e148, < 0ec9ddc1bda261a2c57636c74c8b4e53000102c9; >= ad49d86e07a497e834cb06f2b151dccd75f8e148, < 56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389; >= ad49d86e07a497e834cb06f2b151dccd75f8e148, < debc57b83d5b323df74bf010c8d50fe26ad2ed6b; >= ad49d86e07a497e834cb06f2b151dccd75f8e148, < 0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88; >= ad49d86e07a497e834cb06f2b151dccd75f8e148, < 640441348258220e78daed40528b85b8afcedab6; >= ad49d86e07a497e834cb06f2b151dccd75f8e148, < aaf80701dc2f7a48fe543961e21f8ca3924d587c; >= ad49d86e07a497e834cb06f2b151dccd75f8e148, < fbf0591275f50eae5733c3d7a8cd6c1e79933ffa; >= ad49d86e07a497e834cb06f2b151dccd75f8e148, < 2fcba19caaeb2a33017459d3430f057967bb91b6
LinuxLinux5.3
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP>= V3.1.6, < *
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP>= V3.1.7, < *
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP>= V3.1.6, < *
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP>= V3.1.7, < *
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP>= V3.1.6, < *
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP>= V3.1.7, < *
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP>= V3.1.6, < *
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP>= V3.1.7, < *
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystem< *
SiemensSIPLUS S7-1500 CPU 1518-4 PN/DP MFP>= V3.1.6, < *
SiemensSIPLUS S7-1500 CPU 1518-4 PN/DP MFP>= V3.1.7, < *

References

Timeline

Published
Jun 25, 2026
Last modified
Nov 10, 2026
NVD status
Modified

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CVE-2026-53269: Medium severity, CVSS 5.5 | Vulnix