SB2026110860 - Deadlock in Linux kernel server mgmt
Published: November 8, 2026
Security Bulletin ID
SB2026110860
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) Deadlock (CVE-ID: CVE-2026-99276)
CWE-ID: CWE-833 - Deadlock
CVSSv4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/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 in the Linux kernel SMB server (ksmbd).
The vulnerability exists due to inconsistent lock ordering in ksmbd session management when connection expiration checks overlap with session teardown and a writer is queued on conn_list_lock. A remote user can trigger overlapping session operations that may deadlock the expiration worker and session teardown to cause a denial of service.
Remediation
Install update from vendor's website.