CVE-2024-41019

What it actually does

Missing sanity checks on ff offset in ntfs3 allows walking an unvalidated offset that can exceed allocated bounds, resulting in an out-of-bounds read.

Why it matters to the business

Kernel memory disclosure or crash on systems using ntfs3 can lead to information leaks, denial of service, or local privilege escalation, affecting Linux servers, desktops, and embedded devices that mount NTFS volumes.

How an attack unfolds

An attacker with the ability to supply a crafted NTFS filesystem image or trigger ntfs3 operations mounts the image, causes the driver to parse an ff offset that exceeds first_free bounds, and reads kernel memory beyond the intended structure.

How to fix it

Upgrade the Linux kernel to commit 35652dfa8cc9a8a900ec0f1e0395781f94ffc5f0 or later stable releases that include the ff offset validation. Rebuild and reboot with the patched kernel; disable ntfs3 if the filesystem is not required.

How to confirm the fix worked

Confirm the running kernel contains commit 35652dfa8cc9a8a900ec0f1e0395781f94ffc5f0 via git log or uname output, then attempt to mount a test NTFS image containing a large ff offset and verify no out-of-bounds access occurs.

Typical attack path

1. Obtain or craft a malicious NTFS volume containing an oversized ff offset
2. Mount the volume on a vulnerable Linux kernel using the ntfs3 driver
3. Trigger directory enumeration or file walk that dereferences the unchecked offset
4. Read kernel memory past the allocation boundary

How to detect it

Review kernel logs for ntfs3-related oops or page-fault messages involving ff offset values, monitor for unexpected mounts of NTFS volumes, and inspect auditd or syscall logs for mount operations on removable media.

What your security team should do

• Prioritize kernel updates on all systems exposing ntfs3 to untrusted volumes
• Add kernel version checks to asset inventory and patch management workflows
• Consider blacklisting the ntfs3 module via modprobe.d until patches are applied where feasible