ksmbd: skip lock-range check on equal size to avoid size==0 underflow
CVE-2025-68786 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-68786, released January 13, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 6.1.162-1 | DEBIAN-CVE-2025-68786 | Jan 13, 2026 |
| linux · Debian 13.5 (trixie) | 6.12.69-1 | DEBIAN-CVE-2025-68786 | Jan 13, 2026 |
| linux · Debian 14 | 6.18.3-1 | DEBIAN-CVE-2025-68786 | Jan 13, 2026 |
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