ntfs: bound the free-cluster bitmap scan to the volume

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89614
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:46 UTC
Updated2026-09-11 20:19:46 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ntfs: bound the free-cluster bitmap scan to the volume vol->lcn_empty_bits_per_page is sized from vol->nr_clusters at mount, but ntfs_cluster_alloc() bounds its scan of that array by the size of $Bitmap. Those are independent on-disk quantities and the mount-time check only rejects a $Bitmap that is too small, so an image whose $Bitmap covers more clusters than the volume has lets the scan index past the array. A run whose LCN lies in that gap takes the allocator straight there, since the caller passes the file's own last LCN as its locality hint. KASAN reports a slab out-of-bounds read when a file on such a volume is extended. Clamp the scan to what that array covers, mirroring the max_index calculation the mount-time scan already uses, and reject a decoded LCN at or beyond nr_clusters in the mapping pairs decoder. Conforming volumes are unaffected.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 11ccc9107dc460de28af90fac1f42404d9802735 dc15a9f5307d5372aef3b64bf3ed7802f530c471 git Not specified
CNA Linux Linux affected 11ccc9107dc460de28af90fac1f42404d9802735 19cac7902a8ab748e15f98ddaafcf5f8882be21d git Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/dc15a9f5307d5372aef3b64bf3ed7802f530c471 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/19cac7902a8ab748e15f98ddaafcf5f8882be21d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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