Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 8a07eb0a50aebc8c95478d49c28c7f8419a26cef, < dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886; >= 8a07eb0a50aebc8c95478d49c28c7f8419a26cef, < fad4766a74220fe579c6fcaa10ba01c23529814f; >= 8a07eb0a50aebc8c95478d49c28c7f8419a26cef, < 936658ec41c28c397ef390140e02d4c91ade92f0; >= 8a07eb0a50aebc8c95478d49c28c7f8419a26cef, < 8de65194a04d2552cd39b6c67d942d490f22d174; >= 8a07eb0a50aebc8c95478d49c28c7f8419a26cef, < 6160e756db81d6cb63e3e2952efcf6c5134be385; >= 8a07eb0a50aebc8c95478d49c28c7f8419a26cef, < 18d704bdd809377dfd81a3c2f42426763b5da227; >= 8a07eb0a50aebc8c95478d49c28c7f8419a26cef, < 4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7; >= 8a07eb0a50aebc8c95478d49c28c7f8419a26cef, < c9158ceaf27780ef64534ad72f44ffde3f8ccc49 |
| Linux | Linux | 3.1 |
References
- https://git.kernel.org/stable/c/18d704bdd809377dfd81a3c2f42426763b5da227
- https://git.kernel.org/stable/c/4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7
- https://git.kernel.org/stable/c/6160e756db81d6cb63e3e2952efcf6c5134be385
- https://git.kernel.org/stable/c/8de65194a04d2552cd39b6c67d942d490f22d174
- https://git.kernel.org/stable/c/936658ec41c28c397ef390140e02d4c91ade92f0
- https://git.kernel.org/stable/c/c9158ceaf27780ef64534ad72f44ffde3f8ccc49
- https://git.kernel.org/stable/c/dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886
- https://git.kernel.org/stable/c/fad4766a74220fe579c6fcaa10ba01c23529814f
Timeline
- Published
- Aug 22, 2026
- Last modified
- Oct 16, 2026
- NVD status
- Received