{"id":"CVE-2026-53212","revision":"38316a150c094e31a55aa95820da657b","records":[{"revision":"38316a150c094e31a55aa95820da657b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53212","aliases":[],"title":"netfilter: nft_tunnel: fix use-after-free on object destroy","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_tunnel: fix use-after-free on object destroy\n\nnft_tunnel_obj_destroy() calls metadata_dst_free() which directly\nkfree()s the metadata_dst, ignoring the dst_entry refcount. Packets\nthat took a reference via dst_hold() in nft_tunnel_obj_eval() and\nare still queued (e.g. in a netem qdisc) are left with a dangling\npointer. When these packets are eventually dequeued, dst_release()\noperates on freed memory.\n\nReplace metadata_dst_free() with dst_release() so the metadata_dst\nis freed only after all references are dropped. The dst subsystem\nalready handles metadata_dst cleanup in dst_destroy() when\nDST_METADATA is set.","state":0,"publishedAt":"2026-06-25T08:39:16.888+00:00","modifiedAt":"2026-10-19T19:57:29+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/nft_tunnel.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"af308b94a2a4a5a27bec9028354c4df444a7c8ba\",\n                            \"lessThan\": \"349df61526d2e39decc685d246202e3e284cfe05\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"af308b94a2a4a5a27bec9028354c4df444a7c8ba\",\n                            \"lessThan\": \"55b79b1ae42372012413ce0413181d26679b17ef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"af308b94a2a4a5a27bec9028354c4df444a7c8ba\",\n                            \"lessThan\": \"5e9ee18b27fde88cb6148202b33916c66693fe82\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"af308b94a2a4a5a27bec9028354c4df444a7c8ba\",\n                            \"lessThan\": \"8767fe4079affa74314d7eb3220e700150289842\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"af308b94a2a4a5a27bec9028354c4df444a7c8ba\",\n                            \"lessThan\": \"fda6573a46ad24f35348e024905ee5bdf729797e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"af308b94a2a4a5a27bec9028354c4df444a7c8ba\",\n                            \"lessThan\": \"941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"af308b94a2a4a5a27bec9028354c4df444a7c8ba\",\n                            \"lessThan\": \"f9a0e4b61054cde89a2a77845293c726cc07cc43\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"af308b94a2a4a5a27bec9028354c4df444a7c8ba\",\n                            \"lessThan\": \"c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a\",\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/nft_tunnel.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.259\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.210\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.176\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.143\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.94\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.36\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.13\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\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/349df61526d2e39decc685d246202e3e284cfe05","https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef","https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82","https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842","https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e","https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3","https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43","https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53212","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53212","identifiers":["CVE-2026-53212"]},"retained":false,"historicalAffected":[]}],"coverage":[]}