SB2026081573 - Use-after-free in Linux kernel core seq

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Main Vulnerability Database SB2026081573

SB2026081573 - Use-after-free in Linux kernel core seq

Published: August 15, 2026

Security Bulletin ID SB2026081573
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-2026-74387)

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 or execute arbitrary code.

The vulnerability exists due to use-after-free in the ALSA sequencer MIDI output handling in sound/core/seq/seq_midi.c when processing MIDI sequencer events during concurrent output teardown. A local user can trigger concurrent event processing and output teardown to cause a denial of service or execute arbitrary code.

The issue occurs because the event_input path can keep using a stale substream or runtime after the last unuse path releases the rawmidi file.


Remediation

Install update from vendor's website.

References