CVE-2026-74688
sctp: clear control chunk transport if it is being removed
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.
INFO
Published Date :
Aug. 22, 2026, 4:16 p.m.
Last Modified :
Aug. 22, 2026, 4:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-74688
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Apply the Linux kernel patch for sctp.
- Update the Linux kernel to the patched version.
- Clear chunk->transport for queued control chunks.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74688.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74688 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74688
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74688 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74688 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 22, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '8a07eb0a50aebc8c95478d49c28c7f8419a26cef', 'lessThan': 'dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886', 'versionType': 'git'}, {'status': 'affected', 'version': '8a07eb0a50aebc8c95478d49c28c7f8419a26cef', 'lessThan': 'fad4766a74220fe579c6fcaa10ba01c23529814f', 'versionType': 'git'}, {'status': 'affected', 'version': '8a07eb0a50aebc8c95478d49c28c7f8419a26cef', 'lessThan': '936658ec41c28c397ef390140e02d4c91ade92f0', 'versionType': 'git'}, {'status': 'affected', 'version': '8a07eb0a50aebc8c95478d49c28c7f8419a26cef', 'lessThan': '8de65194a04d2552cd39b6c67d942d490f22d174', 'versionType': 'git'}, {'status': 'affected', 'version': '8a07eb0a50aebc8c95478d49c28c7f8419a26cef', 'lessThan': '6160e756db81d6cb63e3e2952efcf6c5134be385', 'versionType': 'git'}, {'status': 'affected', 'version': '8a07eb0a50aebc8c95478d49c28c7f8419a26cef', 'lessThan': '18d704bdd809377dfd81a3c2f42426763b5da227', 'versionType': 'git'}, {'status': 'affected', 'version': '8a07eb0a50aebc8c95478d49c28c7f8419a26cef', 'lessThan': '4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7', 'versionType': 'git'}, {'status': 'affected', 'version': '8a07eb0a50aebc8c95478d49c28c7f8419a26cef', 'lessThan': 'c9158ceaf27780ef64534ad72f44ffde3f8ccc49', 'versionType': 'git'}], 'programFiles': ['net/sctp/associola.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.1'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.1', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.265', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.216', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.183', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.152', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.104', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.45', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.9', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/sctp/associola.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/18d704bdd809377dfd81a3c2f42426763b5da227 Added Reference https://git.kernel.org/stable/c/4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7 Added Reference https://git.kernel.org/stable/c/6160e756db81d6cb63e3e2952efcf6c5134be385 Added Reference https://git.kernel.org/stable/c/8de65194a04d2552cd39b6c67d942d490f22d174 Added Reference https://git.kernel.org/stable/c/936658ec41c28c397ef390140e02d4c91ade92f0 Added Reference https://git.kernel.org/stable/c/c9158ceaf27780ef64534ad72f44ffde3f8ccc49 Added Reference https://git.kernel.org/stable/c/dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886 Added Reference https://git.kernel.org/stable/c/fad4766a74220fe579c6fcaa10ba01c23529814f