CVE-2026-99101 ntfs: move attribute payload before shrinking its record
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99101?
CVE-2026-99101 is a vulnerability in Linux, published on 28 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ntfs: move attribute payload before shrinking its record
ntfs_new_attr_flags() resizes the non-resident attribute record before moving its name and mapping pairs to their shorter-header offsets when compression or sparse state is cleared.
Shrinking the record first moves the following attribute over the tail of the old record. The subsequent memmove() therefore copies bytes from that following attribute instead of the old mapping pairs. Re-enabling compression on an empty file persists those bytes as a malformed mapping pairs array, which ntfsck reports as a missing or invalid run length.
Move the payload before shrinking the record, while retaining the existing resize-before-move ordering when growing it.
Which versions are affected by CVE-2026-99101?
How do I fix CVE-2026-99101?
Upgrade to a fixed version.
Is CVE-2026-99101 being exploited?
There is no known exploitation of CVE-2026-99101 in the wild and no public exploit code.
Sources
Also known as AZL-111191, BELL-CVE-2026-99101, DEBIAN-CVE-2026-99101, GHSA-qx38-c9rc-r9x7, UBUNTU-CVE-2026-99101.