Race condition in Linux kernel - CVE-2026-93794
Published: September 25, 2026
Vulnerability identifier: #VU152093
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-2026-93794
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause punched file ranges to be incorrectly reported as allocated data.
The vulnerability exists due to improper synchronization in the SMB client smb3_punch_hole function when punching a hole after a large buffered write. A local user can perform a large buffered write followed by a hole-punch operation to cause punched file ranges to be incorrectly reported as allocated data.
Affected software
Linux kernel
How to mitigate CVE-2026-93794
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3