CVE-2026-89574

Status: UPDATED  |  Advisory ID: CVE-2026-89574

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

dm array: validate array block headers on read

array_block_check() validates blocknr and csum and nothing else, while

node_check(), next to it, has bounded the structural fields since both

were written. dm_array_cursor_next() takes its loop bound from the

on-disk nr_entries and element_at() is unguarded pointer arithmetic, so

a count larger than the block holds keeps the cursor in one block while

the index grows past it and the read walks off the dm-bufio buffer --

dm_cache_load_mappings() drives it once per cache block at activation.

Check the header against itself: reject a zero value_size, require

max_entries to equal calc_max_entries() for that value_size and block

size, and require nr_entries to fit. Equality rather than an upper bound,

since a count below the real capacity trips BUG_ON() in fill_ablock() and

trim_ablock(). Metadata dm-array writes satisfies all three. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References