SB20260912149 - Sensitive Information in Resource Not Removed Before Reuse in Linux kernel smb client
Published: September 12, 2026
Security Bulletin ID
SB20260912149
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Sensitive Information in Resource Not Removed Before Reuse (CVE-ID: CVE-2026-89642)
CWE-ID: CWE-226 - Sensitive Information in Resource Not Removed Before Reuse
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to incomplete clearing of page-cache data in cifs_setsize() when extending a file. A local user can extend a file to disclose sensitive information.
Dirty bytes in the page region spanning the previous end of file can be written back to the server.
Remediation
Install update from vendor's website.