SB20260815140 - Use of Uninitialized Variable in Linux kernel core seq

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Main Vulnerability Database SB20260815140

SB20260815140 - Use of Uninitialized Variable in Linux kernel core seq

Published: August 15, 2026

Security Bulletin ID SB20260815140
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use of Uninitialized Variable (CVE-ID: CVE-2026-74339)

CWE-ID: CWE-457 - Use of Uninitialized Variable

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to improper initialization in snd_seq_read() when copying queued variable-length event headers to userspace. A local user can write a direct variable event to itself and read back a kernel pointer from the returned header to disclose sensitive information.

The issue affects ALSA sequencer variable-length events that use SNDRV_SEQ_EXT_CHAINED internally.


Remediation

Install update from vendor's website.

References