{"cve":"CVE-2026-53269","nvd":{"published":"2026-06-25T09:16:45.007","modified":"2026-10-15T02:20:08.493","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: synproxy: add mutex to guard hook reference counting\n\nAs the synproxy infrastructure register netfilter hooks on-demand when a\nuser adds the first iptables target or nftables expression, if done\nconcurrently they can race each other.\n\nIntroduce a mutex to serialize the refcount control blocks access from\nboth frontends. While a per namespace mutex might be more efficient, it\nis not needed for target/expression like SYNPROXY.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/0ec9ddc1bda261a2c57636c74c8b4e53000102c9","https://git.kernel.org/stable/c/0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88","https://git.kernel.org/stable/c/2fcba19caaeb2a33017459d3430f057967bb91b6","https://git.kernel.org/stable/c/56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389","https://git.kernel.org/stable/c/640441348258220e78daed40528b85b8afcedab6"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:41:17.107060303+00:00"},"epss":{"cve":"CVE-2026-53269","score":0.0012,"percentile":0.01802,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}