SB2026062673 - Use of Uninitialized Variable in Linux kernel rseq_exit_user_update()
Published: June 26, 2026
Security Bulletin ID
SB2026062673
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use of Uninitialized Variable (CVE-ID: CVE-2026-53243)
CWE-ID: CWE-457 - Use of Uninitialized Variable
CVSSv4: 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/E:U/U:Clear
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to use of an uninitialized variable in rseq_exit_user_update() when updating rseq state for a task. A local user can trigger the vulnerable code path to disclose sensitive information.
Remediation
Install update from vendor's website.