SB20260325105 - Use After Free in Linux kernel crypto ccp driver
Published: March 25, 2026
Security Bulletin ID
SB20260325105
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use After Free (CVE-ID: CVE-2026-23344)
The vulnerability allows a local user to execute arbitrary code or cause a denial of service.
The vulnerability exists due to a use-after-free in the sev_tsm_init_locked() function in the crypto: ccp subsystem when handling error conditions. A local user can trigger the error path to access freed memory, leading to undefined behavior including potential code execution or system crash.
Exploitation requires the ability to trigger the SEV-TSM initialization error path, which is accessible to locally authenticated users.
Remediation
Install update from vendor's website.