CVE-2026-90118

/// Technical description

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

ntfs: fix off-by-one page overflow in ntfs_decompress()

The per-token range check in ntfs_decompress() uses

if (cb >= cb_sb_end || dp_addr > dp_sb_end)

break;

so dp_addr == dp_sb_end falls through to the symbol copy

`*dp_addr++ = *cb++`, writing one byte past the destination page. Since

NTFS_SB_SIZE == PAGE_SIZE the destination is a single page, so the byte

lands in the adjacent page, and *dest_ofs is left one past the sub-block

end (the later `*dest_ofs &= ~PAGE_MASK` then yields 1, not 0, so the page

is never finalized and later sub-blocks keep writing further past it). A

corrupted compressed $DATA attribute thus produces a bounded run of

out-of-bounds writes when the file is read.

Break as soon as dp_addr reaches dp_sb_end; a full sub-block still

completes, as its final copy advances dp_addr to exactly dp_sb_end.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References