SB20260912106 - NULL pointer dereference in Linux kernel nfsd
Published: September 12, 2026
Security Bulletin ID
SB20260912106
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote 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-2026-89679)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a null pointer dereference in nfsd4_setattr() when processing NFSv4 SETATTR requests containing delegation timestamp attributes and a one stateid. A remote attacker can send a specially crafted NFSv4 SETATTR request to cause a denial of service.
No delegation or prior state is required.
Remediation
Install update from vendor's website.