{"id":"CVE-2026-53269","summary":"netfilter: synproxy: add mutex to guard hook reference counting","details":"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.","modified":"2026-06-27T12:02:25.947003467Z","published":"2026-06-25T08:39:55.172Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53269.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0ec9ddc1bda261a2c57636c74c8b4e53000102c9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2fcba19caaeb2a33017459d3430f057967bb91b6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389"},{"type":"WEB","url":"https://git.kernel.org/stable/c/640441348258220e78daed40528b85b8afcedab6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aaf80701dc2f7a48fe543961e21f8ca3924d587c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/debc57b83d5b323df74bf010c8d50fe26ad2ed6b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fbf0591275f50eae5733c3d7a8cd6c1e79933ffa"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53269.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53269"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ad49d86e07a497e834cb06f2b151dccd75f8e148"},{"fixed":"0ec9ddc1bda261a2c57636c74c8b4e53000102c9"},{"fixed":"56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389"},{"fixed":"debc57b83d5b323df74bf010c8d50fe26ad2ed6b"},{"fixed":"0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88"},{"fixed":"640441348258220e78daed40528b85b8afcedab6"},{"fixed":"aaf80701dc2f7a48fe543961e21f8ca3924d587c"},{"fixed":"fbf0591275f50eae5733c3d7a8cd6c1e79933ffa"},{"fixed":"2fcba19caaeb2a33017459d3430f057967bb91b6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53269.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.3.0"},{"fixed":"5.10.259"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.94"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53269.json"}}],"schema_version":"1.7.5"}