{"id":"CVE-2023-53619","revision":null,"records":[{"revision":"8106dc684a604568943e12a6cdacda12","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2023-53619","aliases":[],"title":"netfilter: conntrack: Avoid nf_ct_helper_hash uses after free","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: Avoid nf_ct_helper_hash uses after free\n\nIf nf_conntrack_init_start() fails (for example due to a\nregister_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini()\nclean-up path frees the nf_ct_helper_hash map.\n\nWhen built with NF_CONNTRACK=y, further netfilter modules (e.g:\nnetfilter_conntrack_ftp) can still be loaded and call\nnf_conntrack_helpers_register(), independently of whether nf_conntrack\ninitialized correctly. This accesses the nf_ct_helper_hash dangling\npointer and causes a uaf, possibly leading to random memory corruption.\n\nThis patch guards nf_conntrack_helper_register() from accessing a freed\nor uninitialized nf_ct_helper_hash pointer and fixes possible\nuses-after-free when loading a conntrack module.","state":0,"publishedAt":"2025-10-07T15:19:26.003+00:00","modifiedAt":"2026-10-15T21:41:31.97+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/netfilter/nf_conntrack_helper.c\"\n ],\n \"versions\": [\n {\n \"version\": \"12f7a505331e6b2754684b509f2ac8f0011ce644\",\n \"lessThan\": \"4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"12f7a505331e6b2754684b509f2ac8f0011ce644\",\n \"lessThan\": \"00716f25f9697d02a0d9bd622575c7c7321ba3d0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"12f7a505331e6b2754684b509f2ac8f0011ce644\",\n \"lessThan\": \"61c7a5256543ae7d24cd9d21853d514c8632e1e9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"12f7a505331e6b2754684b509f2ac8f0011ce644\",\n \"lessThan\": \"8289d422f5e484efe4a565fe18e862ecd621c175\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"12f7a505331e6b2754684b509f2ac8f0011ce644\",\n \"lessThan\": \"6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"12f7a505331e6b2754684b509f2ac8f0011ce644\",\n \"lessThan\": \"05561f822f27b9fa88fa5504ddec34bf38833034\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"12f7a505331e6b2754684b509f2ac8f0011ce644\",\n \"lessThan\": \"fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"12f7a505331e6b2754684b509f2ac8f0011ce644\",\n \"lessThan\": \"6eef7a2b933885a17679eb8ed0796ddf0ee5309b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/netfilter/nf_conntrack_helper.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.6\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.6\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.14.322\",\n \"lessThanOrEqual\": \"4.14.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.19.291\",\n \"lessThanOrEqual\": \"4.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.251\",\n \"lessThanOrEqual\": \"5.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.188\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.121\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.39\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.4.4\",\n \"lessThanOrEqual\": \"6.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.5\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7","https://git.kernel.org/stable/c/00716f25f9697d02a0d9bd622575c7c7321ba3d0","https://git.kernel.org/stable/c/61c7a5256543ae7d24cd9d21853d514c8632e1e9","https://git.kernel.org/stable/c/8289d422f5e484efe4a565fe18e862ecd621c175","https://git.kernel.org/stable/c/6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566","https://git.kernel.org/stable/c/05561f822f27b9fa88fa5504ddec34bf38833034","https://git.kernel.org/stable/c/fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7","https://git.kernel.org/stable/c/6eef7a2b933885a17679eb8ed0796ddf0ee5309b"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-53619","license":"CVE Program Terms of Use","key":"cve-program:CVE-2023-53619","identifiers":["CVE-2023-53619"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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