CVE-2026-74688
CVE CVE-2026-74688EUVD EUVD-2026-64375Published 2026-08-22T15:32:53.000ZLast changed 2026-08-25T05:41:32.000ZCVSS 9.8
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.18.45; 8a07eb0a50aebc8c95478d49c28c7f8419a26cef <dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886; 8a07eb0a50aebc8c95478d49c28c7f8419a26cef <fad4766a74220fe579c6fcaa10ba01c23529814f; patch: 6.12.104; 8a07eb0a50aebc8c95478d49c28c7f8419a26cef <936658ec41c28c397ef390140e02d4c91ade92f0; patch: 7.2; 3.1; 8a07eb0a50aebc8c95478d49c28c7f8419a26cef <8de65194a04d2552cd39b6c67d942d490f22d174; patch: 5.10.265; 8a07eb0a50aebc8c95478d49c28c7f8419a26cef <6160e756db81d6cb63e3e2952efcf6c5134be385; patch: 7.1.9; patch: 6.1.183; patch: 6.6.152; 8a07eb0a50aebc8c95478d49c28c7f8419a26cef <c9158ceaf27780ef64534ad72f44ffde3f8ccc49; patch: 0; 8a07eb0a50aebc8c95478d49c28c7f8419a26cef <4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7; 8a07eb0a50aebc8c95478d49c28c7f8419a26cef <18d704bdd809377dfd81a3c2f42426763b5da227; patch: 5.15.216
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
Does this concern one of your customers?
This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.
Try it for 28 daysPatchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.