Local kernel compromise via NTFS label race
Published Jul 19, 2026 · Updated Jul 19, 2026
Use-after-free in Linux Kernel 7.1 through 7.1.2 allows local users to compromise the kernel via concurrent NTFS label ioctls. FS_IOC_SETFSLABEL frees vol->volume_label while FS_IOC_GETFSLABEL calls strlen() and copy_to_user() on the stale pointer because the field lacks mutual exclusion. Reaching the race requires CAP_SYS_ADMIN and a mounted legacy NTFS volume; exploitation exposes kernel heap data and supports corruption, privilege escalation, or a panic.
Summary
What happened
Use-after-free in Linux Kernel 7.1 through 7.1.2 allows local users to compromise the kernel via concurrent NTFS label ioctls. FS_IOC_SETFSLABEL frees vol->volume_label while FS_IOC_GETFSLABEL calls strlen() and copy_to_user() on the stale pointer because the field lacks mutual exclusion. Reaching the race requires CAP_SYS_ADMIN and a mounted legacy NTFS volume; exploitation exposes kernel heap data and supports corruption, privilege escalation, or a panic.
The record
- CVE
- CVE-2026-63793
- Published
- Jul 19, 2026
- Updated
- Jul 19, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 19, 2026CVE publishedPublication date reported by the CVE source.
- Jul 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <7.1.3
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <acd744019460bad22e43d4569a502f9c88d331ae
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e9e50ce4f13dc721014af622613409455c734942
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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