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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.

PUBLISHED Reserved 2025-12-24 | Published 2026-01-13 | Updated 2026-02-09 | Assigner Linux

Product status

Default status
unaffected

f44158485826c076335d6860d35872271a83791d (git) before 52fcbb92e0d3acfd1448b2a43b6595d540da5295
affected

f44158485826c076335d6860d35872271a83791d (git) before da29cd197246c85c0473259f1cad897d9d28faea
affected

f44158485826c076335d6860d35872271a83791d (git) before a6f4cfa3783804336491e0edcb250c25f9b59d33
affected

f44158485826c076335d6860d35872271a83791d (git) before 571204e4758a528fbd67330bd4b0dfbdafb33dd8
affected

f44158485826c076335d6860d35872271a83791d (git) before 5d510ac31626ed157d2182149559430350cf2104
affected

Default status
affected

5.15
affected

Any version before 5.15
unaffected

6.1.160 (semver)
unaffected

6.6.120 (semver)
unaffected

6.12.64 (semver)
unaffected

6.18.3 (semver)
unaffected

6.19 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/52fcbb92e0d3acfd1448b2a43b6595d540da5295

git.kernel.org/...c/da29cd197246c85c0473259f1cad897d9d28faea

git.kernel.org/...c/a6f4cfa3783804336491e0edcb250c25f9b59d33

git.kernel.org/...c/571204e4758a528fbd67330bd4b0dfbdafb33dd8

git.kernel.org/...c/5d510ac31626ed157d2182149559430350cf2104

cve.org (CVE-2025-68786)

nvd.nist.gov (CVE-2025-68786)

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