Incorrect behavior order in Linux kernel - CVE-2026-99101
Published: October 29, 2026
Vulnerability identifier: #VU158486
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99101
CWE-ID: CWE-696
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to corrupt NTFS file attribute metadata.
The vulnerability exists due to incorrect operation ordering in ntfs_new_attr_flags() in fs/ntfs/ea.c when clearing compression or sparse state on a non-resident attribute. A local user can trigger attribute record shrinking followed by payload relocation, causing bytes from the following attribute to replace the original mapping pairs, and then re-enable compression on an empty file to persist a malformed mapping pairs array.
Affected software
Linux kernel
How to mitigate CVE-2026-99101
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3