SB2026091955 - Unchecked Error Condition in Linux kernel smb server
Published: September 19, 2026
Security Bulletin ID
SB2026091955
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) Unchecked Error Condition (CVE-ID: CVE-2026-90164)
CWE-ID: CWE-391 - Unchecked Error Condition
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 ksmbd server initialization when procfs setup fails. A local user can start the ksmbd server after a procfs or per-cpu counter allocation failure to cause a denial of service.
The NULL per-CPU counters pointer is reached on SMP systems.
Remediation
Install update from vendor's website.