CVE-2026-74688 (GCVE-0-2026-74688)
Vulnerability from cvelistv5
Published
2026-08-22 15:32
Modified
2026-10-16 19:16
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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
Impacted products
Vendor Product Version
Linux Linux Version: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef
Version: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef
Version: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef
Version: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef
Version: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef
Version: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef
Version: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef
Version: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef
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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.