SB20260912241 - NULL pointer dereference in Linux kernel sunrpc auth_gss
Published: September 12, 2026
Security Bulletin ID
SB20260912241
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) NULL pointer dereference (CVE-ID: CVE-2026-89544)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper error handling in the SUNRPC gssx XDR option-array decoder when handling an allocation failure while decoding an option array. A local user can trigger the decoder's error path to cause a denial of service.
The affected error paths also include a group_info reference-count leak and a latent use-after-free condition.
Remediation
Install update from vendor's website.