CVE-2023-52640

What it actually does

Out-of-bounds access in ntfs_listxattr when extended attribute name length exceeds allocated EA space, leading to potential kernel memory corruption or information disclosure.

Why it matters to the business

System crashes or instability on Linux hosts mounting NTFS volumes containing crafted extended attributes, increasing downtime risk for file servers and workstations; low exploit probability limits widespread impact despite high ecosystem prevalence of the kernel.

How an attack unfolds

Attacker prepares an NTFS3 volume with an extended attribute whose name exceeds the EA buffer size, then triggers ntfs_listxattr via standard file operations or syscalls; the missing length check allows out-of-bounds read/write during enumeration.

How to fix it

Upgrade the Linux kernel to a version containing commit a585faf0591548fe0920641950ebfa8a6eefe1cd; rebuild and deploy the updated kernel across all affected systems.

How to confirm the fix worked

Confirm the fix is present by inspecting kernel source for the ntfs_listxattr length validation or by running regression tests with crafted extended attributes on an NTFS3 mount.

Typical attack path

1. Obtain or create NTFS volume with malicious extended attributes
2. Mount the volume on a vulnerable Linux kernel using ntfs3 driver
3. Invoke listxattr or equivalent operation on affected files
4. Trigger out-of-bounds condition in ntfs_listxattr

How to detect it

Scan kernel logs and crash reports for ntfs_listxattr references or out-of-bounds warnings; correlate with mount events of NTFS volumes containing extended attributes.

What your security team should do

• Prioritize kernel updates on all systems exposing NTFS3 mounts within the next patching cycle
• Restrict untrusted NTFS volume mounts until patches are applied
• Review filesystem monitoring for unusual extended attribute activity