SB20260720212 - Use-after-free in Linux kernel core seq

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20260720212

SB20260720212 - Use-after-free in Linux kernel core seq

Published: July 20, 2026

Security Bulletin ID SB20260720212
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-64029)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in seq_ump_process_event() and snd_rawmidi_kernel_write1() when processing sequencer events during concurrent output teardown. A local user can trigger concurrent event delivery and output close operations to cause a denial of service.

The issue arises from a race condition between the event_input path and the last output unuse path, where the rawmidi substream runtime may be freed while still in use.


Remediation

Install update from vendor's website.

References