UNKNOWN NVD
CVE-2026-74688
In the Linux kernel, the following vulnerability has been resolved: sctp: clear control chunk transport if it is being removed sctp_make_heartbeat_ack() cache
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.
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
This unknown severity vulnerability was published on 2026-08-22 via NVD.
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