Answer in brief
CVE-2026-74688 records a Critical severity (CVSS 9.8) vulnerability in sctp: clear control chunk transport if it is being removed. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8a07eb0a50aebc8c95478d49c28c7f8419a26cef <dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886 || >=8a07eb0a50aebc8c95478d49c28c7f8419a26cef <fad4766a74220fe579c6fcaa10ba01c23529814f || >=8a07eb0a50aebc8c95478d49c28c7f8419a26cef <936658ec41c28c397ef390140e02d4c91ade92f0 || >=8a07eb0a50aebc8c95478d49c28c7f8419a26cef <8de65194a04d2552cd39b6c67d942d490f22d174 || >=8a07eb0a50aebc8c95478d49c28c7f8419a26cef <6160e756db81d6cb63e3e2952efcf6c5134be385 || >=8a07eb0a50aebc8c95478d49c28c7f8419a26cef <18d704bdd809377dfd81a3c2f42426763b5da227 || >=8a07eb0a50aebc8c95478d49c28c7f8419a26cef <4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7 || >=8a07eb0a50aebc8c95478d49c28c7f8419a26cef <c9158ceaf27780ef64534ad72f44ffde3f8ccc49 | dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886, fad4766a74220fe579c6fcaa10ba01c23529814f, 936658ec41c28c397ef390140e02d4c91ade92f0, 8de65194a04d2552cd39b6c67d942d490f22d174, 6160e756db81d6cb63e3e2952efcf6c5134be385, 18d704bdd809377dfd81a3c2f42426763b5da227, 4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7, c9158ceaf27780ef64534ad72f44ffde3f8ccc49 |
| Linux/Linuxgeneric | 3.1 | Not reported |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 22, 2026
In 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.
Quoted source text, attributed separately from HOL analysis.