SB20260425175 - Always-Incorrect Control Flow Implementation in Linux kernel smb client
Published: April 25, 2026
Security Bulletin ID
SB20260425175
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) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-31534)
CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation
CVSSv4: 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/E:U/U:Green
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper handling of request completion state in smbdirect_send_batch when processing send completions after a broken connection. A local user can trigger a connection break during SMB Direct send processing to cause a denial of service.
Remediation
Install update from vendor's website.