CVE-2025-40067
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: reject index allocation if $BITMAP is empty but blocks exist Index allocation requires at least one bit in the $BITMAP attribute to track usage of index entries. If the bitmap is empty while index blocks are already present, this reflects on-disk corruption. syzbot triggered this condition using a malformed NTFS image. During a rename() operation involving a long filename (which spans multiple index entries), the empty bitmap allowed the name to be added without valid tracking. Subsequent deletion of the original entry failed with -ENOENT, due to unexpected index state. Reject such cases by verifying that the bitmap is not empty when index blocks exist.
Affected versions
Linux kernel versions
6.6.102,
6.12.42,
6.15.10,
6.16.1,
6.17
and later are affected. Fixed in
6.6.112,
6.12.53,
6.17.3,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40067 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/039ddf353cc33f6546a87ec1ac3210637d714bec
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PatchKernel patch commithttps://git.kernel.org/stable/c/0dc7117da8f92dd5fe077d712a756eccbe377d40
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PatchKernel patch commithttps://git.kernel.org/stable/c/978aac54e93ea35aab20b32ae393d3d33964e7ae
Frequently asked questions
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What is CVE-2025-40067?
CVE-2025-40067 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.6.102 onward and has been patched in 6.6.112, 6.12.53, 6.17.3 and others. CVE-2025-40067 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40067?
Yes — CVE-2025-40067 has been patched. Fixed versions include 6.6.112, 6.12.53, 6.17.3 and others. If you are running Linux kernel 6.6.102 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40067 actively exploited?
No — CVE-2025-40067 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.