SB20260912233 - Division by zero in Linux kernel sunrpc auth_gss
Published: September 12, 2026
Security Bulletin ID
SB20260912233
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) Division by zero (CVE-ID: CVE-2026-89550)
CWE-ID: CWE-369 - Divide By Zero
CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper input validation in svcauth_gss_unwrap_priv() when handling a crafted short krb5 token. A remote user can send a crafted token that triggers a division by zero to cause a denial of service.
The issue affects krb5 v2 contexts.
Remediation
Install update from vendor's website.