{"api_version":"1","generated_at":"2026-08-22T21:53:00+00:00","cve":"CVE-2026-74688","urls":{"html":"https://cve.report/CVE-2026-74688","api":"https://cve.report/api/cve/CVE-2026-74688.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74688","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74688"},"summary":{"title":"sctp: clear control chunk transport if it is being removed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear control chunk transport if it is being removed\n\nsctp_make_heartbeat_ack() caches the destination transport in\nchunk->transport without taking a reference. When src_out_of_asoc_ok is\nenabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead\nof being transmitted immediately.\n\nIf the peer transport is removed while the chunk is still queued,\nsctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing,\nbut only clears cached transport pointers in out_chunk_list.  The queued\ncontrol chunk therefore retains a dangling transport pointer.\n\nOnce an ASCONF_ACK clears the suppression and the queued control chunk is\ntransmitted, SCTP dereferences the stale transport pointer, leading to a\nuse-after-free.\n\nFix this by also clearing chunk->transport for queued control chunks in\ncontrol_chunk_list when removing the transport.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-22 16:16:43","updated_at":"2026-08-22 16:16:43"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886","name":"https://git.kernel.org/stable/c/dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/936658ec41c28c397ef390140e02d4c91ade92f0","name":"https://git.kernel.org/stable/c/936658ec41c28c397ef390140e02d4c91ade92f0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7","name":"https://git.kernel.org/stable/c/4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/18d704bdd809377dfd81a3c2f42426763b5da227","name":"https://git.kernel.org/stable/c/18d704bdd809377dfd81a3c2f42426763b5da227","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8de65194a04d2552cd39b6c67d942d490f22d174","name":"https://git.kernel.org/stable/c/8de65194a04d2552cd39b6c67d942d490f22d174","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6160e756db81d6cb63e3e2952efcf6c5134be385","name":"https://git.kernel.org/stable/c/6160e756db81d6cb63e3e2952efcf6c5134be385","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fad4766a74220fe579c6fcaa10ba01c23529814f","name":"https://git.kernel.org/stable/c/fad4766a74220fe579c6fcaa10ba01c23529814f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c9158ceaf27780ef64534ad72f44ffde3f8ccc49","name":"https://git.kernel.org/stable/c/c9158ceaf27780ef64534ad72f44ffde3f8ccc49","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74688","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74688","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8a07eb0a50aebc8c95478d49c28c7f8419a26cef dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8a07eb0a50aebc8c95478d49c28c7f8419a26cef fad4766a74220fe579c6fcaa10ba01c23529814f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8a07eb0a50aebc8c95478d49c28c7f8419a26cef 936658ec41c28c397ef390140e02d4c91ade92f0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8a07eb0a50aebc8c95478d49c28c7f8419a26cef 8de65194a04d2552cd39b6c67d942d490f22d174 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.216 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.152 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.104 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.45 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.9 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sctp/associola.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886","status":"affected","version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","versionType":"git"},{"lessThan":"fad4766a74220fe579c6fcaa10ba01c23529814f","status":"affected","version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","versionType":"git"},{"lessThan":"936658ec41c28c397ef390140e02d4c91ade92f0","status":"affected","version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","versionType":"git"},{"lessThan":"8de65194a04d2552cd39b6c67d942d490f22d174","status":"affected","version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","versionType":"git"},{"lessThan":"6160e756db81d6cb63e3e2952efcf6c5134be385","status":"affected","version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","versionType":"git"},{"lessThan":"18d704bdd809377dfd81a3c2f42426763b5da227","status":"affected","version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","versionType":"git"},{"lessThan":"4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7","status":"affected","version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","versionType":"git"},{"lessThan":"c9158ceaf27780ef64534ad72f44ffde3f8ccc49","status":"affected","version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sctp/associola.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.1"},{"lessThan":"3.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.265","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.216","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.183","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.152","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.104","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.45","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.265","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.216","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.183","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.152","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.104","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.45","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.9","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"3.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear control chunk transport if it is being removed\n\nsctp_make_heartbeat_ack() caches the destination transport in\nchunk->transport without taking a reference. When src_out_of_asoc_ok is\nenabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead\nof being transmitted immediately.\n\nIf the peer transport is removed while the chunk is still queued,\nsctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing,\nbut only clears cached transport pointers in out_chunk_list.  The queued\ncontrol chunk therefore retains a dangling transport pointer.\n\nOnce an ASCONF_ACK clears the suppression and the queued control chunk is\ntransmitted, SCTP dereferences the stale transport pointer, leading to a\nuse-after-free.\n\nFix this by also clearing chunk->transport for queued control chunks in\ncontrol_chunk_list when removing the transport."}],"providerMetadata":{"dateUpdated":"2026-08-22T15:32:53.423Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886"},{"url":"https://git.kernel.org/stable/c/fad4766a74220fe579c6fcaa10ba01c23529814f"},{"url":"https://git.kernel.org/stable/c/936658ec41c28c397ef390140e02d4c91ade92f0"},{"url":"https://git.kernel.org/stable/c/8de65194a04d2552cd39b6c67d942d490f22d174"},{"url":"https://git.kernel.org/stable/c/6160e756db81d6cb63e3e2952efcf6c5134be385"},{"url":"https://git.kernel.org/stable/c/18d704bdd809377dfd81a3c2f42426763b5da227"},{"url":"https://git.kernel.org/stable/c/4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7"},{"url":"https://git.kernel.org/stable/c/c9158ceaf27780ef64534ad72f44ffde3f8ccc49"}],"title":"sctp: clear control chunk transport if it is being removed","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74688","datePublished":"2026-08-22T15:32:53.423Z","dateReserved":"2026-08-15T05:44:03.926Z","dateUpdated":"2026-08-22T15:32:53.423Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-22 16:16:43","lastModifiedDate":"2026-08-22 16:16:43","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74688","Ordinal":"1","Title":"sctp: clear control chunk transport if it is being removed","CVE":"CVE-2026-74688","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74688","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear control chunk transport if it is being removed\n\nsctp_make_heartbeat_ack() caches the destination transport in\nchunk->transport without taking a reference. When src_out_of_asoc_ok is\nenabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead\nof being transmitted immediately.\n\nIf the peer transport is removed while the chunk is still queued,\nsctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing,\nbut only clears cached transport pointers in out_chunk_list.  The queued\ncontrol chunk therefore retains a dangling transport pointer.\n\nOnce an ASCONF_ACK clears the suppression and the queued control chunk is\ntransmitted, SCTP dereferences the stale transport pointer, leading to a\nuse-after-free.\n\nFix this by also clearing chunk->transport for queued control chunks in\ncontrol_chunk_list when removing the transport.","Type":"Description","Title":"sctp: clear control chunk transport if it is being removed"}]}}}