CVE-2026-74688 is a vulnerability in Linux Kernel
Published on August 22, 2026
sctp: clear control chunk transport if it is being removed
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.
Products Associated with CVE-2026-74688
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Affected Versions
Linux:- Version 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and below dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886 is affected.
- Version 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and below fad4766a74220fe579c6fcaa10ba01c23529814f is affected.
- Version 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and below 936658ec41c28c397ef390140e02d4c91ade92f0 is affected.
- Version 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and below 8de65194a04d2552cd39b6c67d942d490f22d174 is affected.
- Version 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and below 6160e756db81d6cb63e3e2952efcf6c5134be385 is affected.
- Version 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and below 18d704bdd809377dfd81a3c2f42426763b5da227 is affected.
- Version 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and below 4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7 is affected.
- Version 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and below c9158ceaf27780ef64534ad72f44ffde3f8ccc49 is affected.
- Version 3.1 is affected.
- Before 3.1 is unaffected.
- Version 5.10.265, <= 5.10.* is unaffected.
- Version 5.15.216, <= 5.15.* is unaffected.
- Version 6.1.183, <= 6.1.* is unaffected.
- Version 6.6.152, <= 6.6.* is unaffected.
- Version 6.12.104, <= 6.12.* is unaffected.
- Version 6.18.45, <= 6.18.* is unaffected.
- Version 7.1.9, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.