SB2026042599 - Double free in Linux kernel smb client
Published: April 25, 2026
Security Bulletin ID
SB2026042599
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) Double free (CVE-ID: CVE-2026-31609)
CWE-ID: CWE-415 - Double Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to double free in smbd_free_send_io() when processing SMB Direct send operations after batch flush handling. A local user can trigger the affected code path to cause a denial of service.
Remediation
Install update from vendor's website.