SB20260912248 - Use-after-free in Linux kernel sunrpc
Published: September 12, 2026
Security Bulletin ID
SB20260912248
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-after-free (CVE-ID: CVE-2026-89536)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a use-after-free condition.
The vulnerability exists due to a use-after-free in SUNRPC client TLS handshake handling when cancellation loses a race with completion of a TLS handshake callback. A local user can interrupt or time out a synchronous TLS handshake wait while the completion callback is in flight to cause a use-after-free condition.
Remediation
Install update from vendor's website.