SB2026082477 - Use-after-free in Linux kernel sctp

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Main Vulnerability Database SB2026082477

SB2026082477 - Use-after-free in Linux kernel sctp

Published: August 24, 2026

Security Bulletin ID SB2026082477
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-74688)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to use-after-free in the SCTP control chunk handling logic when transmitting a queued HEARTBEAT ACK after the associated peer transport has been removed. A remote attacker can trigger peer transport removal while a control chunk retains a stale transport pointer to cause a denial of service.

The issue occurs when src_out_of_asoc_ok is enabled and the HEARTBEAT ACK remains queued on control_chunk_list instead of being transmitted immediately.


Remediation

Install update from vendor's website.

References