SB20260528126 - Use-after-free in Linux kernel hwrng core
Published: May 28, 2026
Security Bulletin ID
SB20260528126
CSH 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 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-45949)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the hwrng core when unregistering and registering hardware random number generator devices concurrently. A local user can trigger repeated register and unregister operations to cause a denial of service.
The issue is caused by a race condition involving the global hwrng_fill pointer and thread lifecycle handling.
Remediation
Install update from vendor's website.