CVE-2026-74688
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.
How to fix
- Linux Linuxdbb3f418a8665ffb0514e1a9520ab6a1c5d4d886, fad4766a74220fe579c6fcaa10ba01c23529814f, 936658ec41c28c397ef390140e02d4c91ade92f0, 8de65194a04d2552cd39b6c67d942d490f22d174, 6160e756db81d6cb63e3e2952efcf6c5134be385, 18d704bdd809377dfd81a3c2f42426763b5da227, 4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7, c9158ceaf27780ef64534ad72f44ffde3f8ccc49 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 8a07eb0a50aebc8c95478d49c28c7f8419a26cef ≤ v < dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886, 8a07eb0a50aebc8c95478d49c28c7f8419a26cef ≤ v < fad4766a74220fe579c6fcaa10ba01c23529814f, 8a07eb0a50aebc8c95478d49c28c7f8419a26cef ≤ v < 936658ec41c28c397ef390140e02d4c91ade92f0, 8a07eb0a50aebc8c95478d49c28c7f8419a26cef ≤ v < 8de65194a04d2552cd39b6c67d942d490f22d174, 8a07eb0a50aebc8c95478d49c28c7f8419a26cef ≤ v < 6160e756db81d6cb63e3e2952efcf6c5134be385, 8a07eb0a50aebc8c95478d49c28c7f8419a26cef ≤ v < 18d704bdd809377dfd81a3c2f42426763b5da227, 8a07eb0a50aebc8c95478d49c28c7f8419a26cef ≤ v < 4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7, 8a07eb0a50aebc8c95478d49c28c7f8419a26cef ≤ v < c9158ceaf27780ef64534ad72f44ffde3f8ccc49, 3.1 | dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886, fad4766a74220fe579c6fcaa10ba01c23529814f, 936658ec41c28c397ef390140e02d4c91ade92f0, 8de65194a04d2552cd39b6c67d942d490f22d174, 6160e756db81d6cb63e3e2952efcf6c5134be385, 18d704bdd809377dfd81a3c2f42426763b5da227, 4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7, c9158ceaf27780ef64534ad72f44ffde3f8ccc49 |
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