{"id":"CVE-2026-52993","revision":"8e3fe9db59734e2aba66506d77b027fa","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":[]}