Improper Authorization in Linux kernel - CVE-2026-98126
Published: September 28, 2026
Vulnerability identifier: #VU152329
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-98126
CWE-ID: CWE-285
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-98126
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3