SB2026021877 - Use-after-free in Linux kernel smb server
Published: February 18, 2026
Security Bulletin ID
SB2026021877
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-23226)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the check_session_id(), ntlm_authenticate() and krb5_authenticate() functions in fs/smb/server/smb2pdu.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.