{"id":"CVE-2026-52993","revision":null,"records":[{"revision":"8e3fe9db59734e2aba66506d77b027fa","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-52993","aliases":[],"title":"tipc: fix double-free in tipc_buf_append()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix double-free in tipc_buf_append()\n\ntipc_msg_validate() can potentially reallocate the skb it is validating,\nfreeing the old one. In tipc_buf_append(), it was being called with a\npointer to a local variable which was a copy of the caller's skb\npointer.\n\nIf the skb was reallocated and validation subsequently failed, the error\nhandling path would free the original skb pointer, which had already\nbeen freed, leading to double-free.\n\nFix this by checking if head now points to a newly allocated reassembled\nskb. If it does, reassign *headbuf for later freeing operations.","state":0,"publishedAt":"2026-06-24T16:29:06.475+00:00","modifiedAt":"2026-10-19T19:47:12.544+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/tipc/msg.c\"\n ],\n \"versions\": [\n {\n \"version\": \"d618d09a68e4eed7a435beb2e355250f6f40664a\",\n \"lessThan\": \"a438975a6dcdbd70865978c021650d1485586f0b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d618d09a68e4eed7a435beb2e355250f6f40664a\",\n \"lessThan\": \"4ee4deadaae7cb2e3d53af0fc889cf92a73413c0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d618d09a68e4eed7a435beb2e355250f6f40664a\",\n \"lessThan\": \"d3556656c6daebf8def751c7e71d11dd0a180d24\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d618d09a68e4eed7a435beb2e355250f6f40664a\",\n \"lessThan\": \"0274f24485fc38032d4093e463dc3ff5c7a667c9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d618d09a68e4eed7a435beb2e355250f6f40664a\",\n \"lessThan\": \"4d104882bc815d4ec666ace9155f5f52715879a6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d618d09a68e4eed7a435beb2e355250f6f40664a\",\n \"lessThan\": \"1d5e589055880fae229e229e1929e087dbe08cf3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d618d09a68e4eed7a435beb2e355250f6f40664a\",\n \"lessThan\": \"29940fff14110ca48c5ccc168d121665b51bb778\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d618d09a68e4eed7a435beb2e355250f6f40664a\",\n \"lessThan\": \"d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a\",\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/tipc/msg.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.15\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.15\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.258\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.209\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.175\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.141\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.91\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.33\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.10\",\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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b","https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0","https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24","https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9","https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6","https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3","https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778","https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-52993","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-52993","identifiers":["CVE-2026-52993"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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