{"api_version":"1","generated_at":"2026-06-27T00:39:53+00:00","cve":"CVE-2026-52993","urls":{"html":"https://cve.report/CVE-2026-52993","api":"https://cve.report/api/cve/CVE-2026-52993.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-52993","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-52993"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-06-24 17:17:10","updated_at":"2026-06-24 17:17:10"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0","name":"https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a","name":"https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b","name":"https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778","name":"https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24","name":"https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6","name":"https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9","name":"https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3","name":"https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-52993","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52993","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d618d09a68e4eed7a435beb2e355250f6f40664a a438975a6dcdbd70865978c021650d1485586f0b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d618d09a68e4eed7a435beb2e355250f6f40664a 4ee4deadaae7cb2e3d53af0fc889cf92a73413c0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d618d09a68e4eed7a435beb2e355250f6f40664a d3556656c6daebf8def751c7e71d11dd0a180d24 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d618d09a68e4eed7a435beb2e355250f6f40664a 0274f24485fc38032d4093e463dc3ff5c7a667c9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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00:07:47"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/tipc/msg.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a438975a6dcdbd70865978c021650d1485586f0b","status":"affected","version":"d618d09a68e4eed7a435beb2e355250f6f40664a","versionType":"git"},{"lessThan":"4ee4deadaae7cb2e3d53af0fc889cf92a73413c0","status":"affected","version":"d618d09a68e4eed7a435beb2e355250f6f40664a","versionType":"git"},{"lessThan":"d3556656c6daebf8def751c7e71d11dd0a180d24","status":"affected","version":"d618d09a68e4eed7a435beb2e355250f6f40664a","versionType":"git"},{"lessThan":"0274f24485fc38032d4093e463dc3ff5c7a667c9","status":"affected","version":"d618d09a68e4eed7a435beb2e355250f6f40664a","versionType":"git"},{"lessThan":"4d104882bc815d4ec666ace9155f5f52715879a6","status":"affected","version":"d618d09a68e4eed7a435beb2e355250f6f40664a","versionType":"git"},{"lessThan":"1d5e589055880fae229e229e1929e087dbe08cf3","status":"affected","version":"d618d09a68e4eed7a435beb2e355250f6f40664a","versionType":"git"},{"lessThan":"29940fff14110ca48c5ccc168d121665b51bb778","status":"affected","version":"d618d09a68e4eed7a435beb2e355250f6f40664a","versionType":"git"},{"lessThan":"d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a","status":"affected","version":"d618d09a68e4eed7a435beb2e355250f6f40664a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/tipc/msg.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.15"},{"lessThan":"4.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.258","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.209","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.175","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.141","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.91","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.33","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.258","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.209","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.175","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.141","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.91","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.33","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.10","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"4.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-06-24T16:29:06.475Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b"},{"url":"https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0"},{"url":"https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24"},{"url":"https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9"},{"url":"https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6"},{"url":"https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3"},{"url":"https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778"},{"url":"https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a"}],"title":"tipc: fix double-free in tipc_buf_append()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-52993","datePublished":"2026-06-24T16:29:06.475Z","dateReserved":"2026-06-09T07:44:35.377Z","dateUpdated":"2026-06-24T16:29:06.475Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-24 17:17:10","lastModifiedDate":"2026-06-24 17:17:10","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"52993","Ordinal":"1","Title":"tipc: fix double-free in tipc_buf_append()","CVE":"CVE-2026-52993","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"52993","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"tipc: fix double-free in tipc_buf_append()"}]}}}