{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53269","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-06-09T07:44:35.395Z","datePublished":"2026-06-25T08:39:55.172Z","dateUpdated":"2026-06-25T08:39:55.172Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-06-25T08:39:55.172Z"},"descriptions":[{"lang":"en","value":"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nf_synproxy_core.c"],"versions":[{"version":"ad49d86e07a497e834cb06f2b151dccd75f8e148","lessThan":"0ec9ddc1bda261a2c57636c74c8b4e53000102c9","status":"affected","versionType":"git"},{"version":"ad49d86e07a497e834cb06f2b151dccd75f8e148","lessThan":"56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389","status":"affected","versionType":"git"},{"version":"ad49d86e07a497e834cb06f2b151dccd75f8e148","lessThan":"debc57b83d5b323df74bf010c8d50fe26ad2ed6b","status":"affected","versionType":"git"},{"version":"ad49d86e07a497e834cb06f2b151dccd75f8e148","lessThan":"0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88","status":"affected","versionType":"git"},{"version":"ad49d86e07a497e834cb06f2b151dccd75f8e148","lessThan":"640441348258220e78daed40528b85b8afcedab6","status":"affected","versionType":"git"},{"version":"ad49d86e07a497e834cb06f2b151dccd75f8e148","lessThan":"aaf80701dc2f7a48fe543961e21f8ca3924d587c","status":"affected","versionType":"git"},{"version":"ad49d86e07a497e834cb06f2b151dccd75f8e148","lessThan":"fbf0591275f50eae5733c3d7a8cd6c1e79933ffa","status":"affected","versionType":"git"},{"version":"ad49d86e07a497e834cb06f2b151dccd75f8e148","lessThan":"2fcba19caaeb2a33017459d3430f057967bb91b6","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nf_synproxy_core.c"],"versions":[{"version":"5.3","status":"affected"},{"version":"0","lessThan":"5.3","status":"unaffected","versionType":"semver"},{"version":"5.10.259","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.210","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.176","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.143","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.94","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.36","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.13","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.12.94"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0ec9ddc1bda261a2c57636c74c8b4e53000102c9"},{"url":"https://git.kernel.org/stable/c/56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389"},{"url":"https://git.kernel.org/stable/c/debc57b83d5b323df74bf010c8d50fe26ad2ed6b"},{"url":"https://git.kernel.org/stable/c/0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88"},{"url":"https://git.kernel.org/stable/c/640441348258220e78daed40528b85b8afcedab6"},{"url":"https://git.kernel.org/stable/c/aaf80701dc2f7a48fe543961e21f8ca3924d587c"},{"url":"https://git.kernel.org/stable/c/fbf0591275f50eae5733c3d7a8cd6c1e79933ffa"},{"url":"https://git.kernel.org/stable/c/2fcba19caaeb2a33017459d3430f057967bb91b6"}],"title":"netfilter: synproxy: add mutex to guard hook reference counting","x_generator":{"engine":"bippy-1.2.0"}}}}