sctp: clear control chunk transport if it is being removed

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74688
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:43 UTC
Updated2026-08-25 06:18:51 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sctp: clear control chunk transport if it is being removed sctp_make_heartbeat_ack() caches the destination transport in chunk->transport without taking a reference. When src_out_of_asoc_ok is enabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead of being transmitted immediately. If the peer transport is removed while the chunk is still queued, sctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing, but only clears cached transport pointers in out_chunk_list. The queued control chunk therefore retains a dangling transport pointer. Once an ASCONF_ACK clears the suppression and the queued control chunk is transmitted, SCTP dereferences the stale transport pointer, leading to a use-after-free. Fix this by also clearing chunk->transport for queued control chunks in control_chunk_list when removing the transport.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.005000000 probability, percentile 0.405440000 (date 2026-08-25)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8a07eb0a50aebc8c95478d49c28c7f8419a26cef dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886 git Not specified
CNA Linux Linux affected 8a07eb0a50aebc8c95478d49c28c7f8419a26cef fad4766a74220fe579c6fcaa10ba01c23529814f git Not specified
CNA Linux Linux affected 8a07eb0a50aebc8c95478d49c28c7f8419a26cef 936658ec41c28c397ef390140e02d4c91ade92f0 git Not specified
CNA Linux Linux affected 8a07eb0a50aebc8c95478d49c28c7f8419a26cef 8de65194a04d2552cd39b6c67d942d490f22d174 git Not specified
CNA Linux Linux affected 8a07eb0a50aebc8c95478d49c28c7f8419a26cef 6160e756db81d6cb63e3e2952efcf6c5134be385 git Not specified
CNA Linux Linux affected 8a07eb0a50aebc8c95478d49c28c7f8419a26cef 18d704bdd809377dfd81a3c2f42426763b5da227 git Not specified
CNA Linux Linux affected 8a07eb0a50aebc8c95478d49c28c7f8419a26cef 4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7 git Not specified
CNA Linux Linux affected 8a07eb0a50aebc8c95478d49c28c7f8419a26cef c9158ceaf27780ef64534ad72f44ffde3f8ccc49 git Not specified
CNA Linux Linux affected 3.1 Not specified
CNA Linux Linux unaffected 3.1 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.152 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/936658ec41c28c397ef390140e02d4c91ade92f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/18d704bdd809377dfd81a3c2f42426763b5da227 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8de65194a04d2552cd39b6c67d942d490f22d174 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6160e756db81d6cb63e3e2952efcf6c5134be385 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fad4766a74220fe579c6fcaa10ba01c23529814f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c9158ceaf27780ef64534ad72f44ffde3f8ccc49 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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