Linux Kernel CVE-2025-40068

In the Linux kernel, the following vulnerability has been resolved:

fs: ntfs3: Fix integer overflow in run_unpack()

The MFT record relative to the file being opened contains its runlist, an array containing information about the file's location on the physical disk. Analysis of all Call Stack paths showed that the values of the runlist array, from which LCNs are calculated, are not validated before run_unpack function.

The run_unpack function decodes the compressed runlist data format from MFT attributes (for example, $DATA), converting them into a runs_tree structure, which describes the mapping of virtual clusters (VCN) to logical clusters (LCN). The NTFS3 subsystem also has a shortcut for deleting files from MFT records - in this case, the RUN_DEALLOCATE command is sent to the run_unpack input, and the function logic provides that all data transferred to the runlist about file or directory is deleted without creating a runs_tree structure.

Substituting the runlist in the $DATA attribute of the MFT record for an arbitrary file can lead either to access to arbitrary data on the disk bypassing access checks to them (since the inode access check occurs above) or to destruction of arbitrary data on the disk.

Add overflow check for addition operation.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

The Linux kernel NTFS3 filesystem driver (fs/ntfs3) is affected on any kernel version shipping NTFS3 (introduced in 5.15) up to the point the fix landed; NVD provides no CPE ranges in this dataset, so exact vulnerable version boundaries are not enumerated here. Fixes were backported across multiple stable branches, evidenced by six kernel.org stable commits (3ac37e10, 5aa5799d, 736fc7bf, 9378cfe2, a86c8b9d, f6b36cfd). Consult the kernel.org stable trees and your distribution's advisory to map the fix to your specific kernel build.