CVE-2026-53269netfilter: synproxy: add mutex to guard hook reference counting
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ad49d86e07a497e834cb06f2b151dccd75f8e148 before 0ec9ddc1bda261a2c57636c74c8b4e53000102c9; from ad49d86e07a497e834cb06f2b151dccd75f8e148 before 56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389; from ad49d86e07a497e834cb06f2b151dccd75f8e148 before debc57b83d5b323df74bf010c8d50fe26ad2ed6b; from ad49d86e07a497e834cb06f2b151dccd75f8e148 before 0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88; from ad49d86e07a497e834cb06f2b151dccd75f8e148 before 640441348258220e78daed40528b85b8afcedab6; from ad49d86e07a497e834cb06f2b151dccd75f8e148 before aaf80701dc2f7a48fe543961e21f8ca3924d587c; from ad49d86e07a497e834cb06f2b151dccd75f8e148 before fbf0591275f50eae5733c3d7a8cd6c1e79933ffa; from ad49d86e07a497e834cb06f2b151dccd75f8e148 before 2fcba19caaeb2a33017459d3430f057967bb91b6 | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.3 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; and 5 more ranges | NVD |
References
- https://git.kernel.org/stable/c/0ec9ddc1bda261a2c57636c74c8b4e53000102c9patch
- https://git.kernel.org/stable/c/56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389patch
- https://git.kernel.org/stable/c/debc57b83d5b323df74bf010c8d50fe26ad2ed6bpatch
- https://git.kernel.org/stable/c/0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88patch
- https://git.kernel.org/stable/c/640441348258220e78daed40528b85b8afcedab6patch
- https://git.kernel.org/stable/c/aaf80701dc2f7a48fe543961e21f8ca3924d587cpatch
- https://git.kernel.org/stable/c/fbf0591275f50eae5733c3d7a8cd6c1e79933ffapatch
- https://git.kernel.org/stable/c/2fcba19caaeb2a33017459d3430f057967bb91b6patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.