SB20260912240 - Use-after-free in Linux kernel sunrpc
Published: September 12, 2026
Security Bulletin ID
SB20260912240
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-89543)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in the Linux kernel SunRPC client pipefs directory handling when accessing stale pipefs entries after a late mount or remount. A local user can invoke rpc_info_open() or rpc_show_info() on a stale pipefs entry to cause a denial of service.
Remediation
Install update from vendor's website.