SB2026072780 - Use of Uninitialized Variable in Linux kernel core seq

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026072780

SB2026072780 - Use of Uninitialized Variable in Linux kernel core seq

Published: July 27, 2026

Security Bulletin ID SB2026072780
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-2026-64479)

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 an uninitialized heap leak in snd_seq_event_dup() when delivering a legacy event to a UMP client with SNDRV_SEQ_FILTER_NO_CONVERT set. A local user can send a crafted event through /dev/snd/seq to disclose sensitive information.

The issue can leak 4 bytes of stale kernel heap data to user space, and exploitation requires a UMP-enabled build.


Remediation

Install update from vendor's website.

References