Linux Kernel ntfs Cluster Free Run Tracking Bug
CVE-2026-98139 Published on September 25, 2026
ntfs: only count successfully cleared runs when freeing clusters
In the Linux kernel, the following vulnerability has been resolved:
ntfs: only count successfully cleared runs when freeing clusters
ntfs_cluster_free_from_rl_nolock() adds a run's length to nr_freed
whenever the error bookkeeping condition is false, which includes
cases where ntfs_bitmap_clear_run() actually failed - e.g. a second
run failing with the same errno as an earlier one, or any failure
after a non-ENOMEM error was already recorded. Since a failed
ntfs_bitmap_clear_run() rolls back its partial modifications, no
bits were cleared for that run, yet its length still inflates
vol->free_clusters, corrupting statfs output and the allocator's
free space gate.
Only count runs whose bitmap clear succeeded.
Products Associated with CVE-2026-98139
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Affected Versions
Linux:- Version 11ccc9107dc460de28af90fac1f42404d9802735 and below 7eb97d8828e7758b9c81277f7802e740a800f78a is affected.
- Version 11ccc9107dc460de28af90fac1f42404d9802735 and below be9e89ccb8e52a3e4b67feeb03ebd8133091dc7e is affected.
- Version 7.1 is affected.
- Before 7.1 is unaffected.
- Version 7.2.7, <= 7.2.* is unaffected.
- Version 7.3-rc2, <= * is unaffected.