SB2026092875 - Improper Authorization in Linux kernel smb client
Published: September 28, 2026 Updated: September 30, 2026
Security Bulletin ID
SB2026092875
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Authorization (CVE-ID: CVE-2026-98126)
CWE-ID: CWE-285 - Improper Authorization
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to bypass file-size limits.
The vulnerability exists due to missing file-size limit validation in smb3_zero_range() when using FALLOC_FL_ZERO_RANGE without FALLOC_FL_KEEP_SIZE on a file on a CIFS mount. A local user can invoke a zero-range operation that extends the end of the file to bypass file-size limits.
Remediation
Install update from vendor's website.