CVE-2026-89574
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, the dm-array array_block_check() function only validated the block number and checksum, without checking the structural header fields. Crafted metadata with an entry count larger than the block capacity causes reads to walk off the dm-bufio buffer, triggered during dm-cache activation.
Risk Assessment
The vulnerability can lead to kernel memory corruption, system crash (oops), or potential kernel-context code execution when using crafted dm-array metadata.
Recommendation
Update the Linux kernel to a version containing the fix that validates array block headers (rejecting zero value_size, requiring max_entries to equal calc_max_entries(), and requiring nr_entries to fit).
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS