Answer in brief
CVE-2026-74688 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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 22, 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.