{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74688","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.926Z","datePublished":"2026-08-22T15:32:53.423Z","dateUpdated":"2026-08-22T15:32:53.423Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-22T15:32:53.423Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/associola.c"],"versions":[{"version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","lessThan":"dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886","status":"affected","versionType":"git"},{"version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","lessThan":"fad4766a74220fe579c6fcaa10ba01c23529814f","status":"affected","versionType":"git"},{"version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","lessThan":"936658ec41c28c397ef390140e02d4c91ade92f0","status":"affected","versionType":"git"},{"version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","lessThan":"8de65194a04d2552cd39b6c67d942d490f22d174","status":"affected","versionType":"git"},{"version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","lessThan":"6160e756db81d6cb63e3e2952efcf6c5134be385","status":"affected","versionType":"git"},{"version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","lessThan":"18d704bdd809377dfd81a3c2f42426763b5da227","status":"affected","versionType":"git"},{"version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","lessThan":"4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7","status":"affected","versionType":"git"},{"version":"8a07eb0a50aebc8c95478d49c28c7f8419a26cef","lessThan":"c9158ceaf27780ef64534ad72f44ffde3f8ccc49","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/associola.c"],"versions":[{"version":"3.1","status":"affected"},{"version":"0","lessThan":"3.1","status":"unaffected","versionType":"semver"},{"version":"5.10.265","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.152","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.104","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.45","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.9","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"6.6.152"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"6.12.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"7.2"}]}]}],"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"}}}}