CVE-2025-68786
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2026-01-13

Last updated on: 2026-01-14

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: skip lock-range check on equal size to avoid size==0 underflow When size equals the current i_size (including 0), the code used to call check_lock_range(filp, i_size, size - 1, WRITE), which computes `size - 1` and can underflow for size==0. Skip the equal case.
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Meta Information
Published
2026-01-13
Last Modified
2026-01-14
Generated
2026-06-16
AI Q&A
2026-01-14
EPSS Evaluated
2026-06-14
NVD
CVE-2025-68786
EUVD
EUVD-2026-2301
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux_kernel ksmbd *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel's ksmbd component involves an underflow issue when checking lock ranges. Specifically, when the size equals the current file size (including zero), the code calls a function with size - 1, which can cause an underflow if size is zero. The fix involves skipping the check when the sizes are equal to avoid this underflow.

Impact Analysis

The vulnerability could potentially cause incorrect behavior or errors in file locking mechanisms within the ksmbd service of the Linux kernel, possibly leading to stability or security issues related to file access. However, specific impacts are not detailed in the provided information.

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