CVE-2026-89574High· 7.8▾ TwilightIn 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 structu…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 5.1
— → 7.8
none → high
7.8 → 5.1
high → medium
5.1 → 7.8
medium → high
7.8 → 5.1
high → medium
5.1 → 5.5
5.5 → 7.8
medium → high
Last analysed / modified upstream
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.
Linux >= 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 < 0e3b8f371c385c212b6e6f76c66f5b3f5bcfea62Linux >= 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 < 67adda7ed5da3e3b64f5b9021a02c21fb374fd9cLinux >= 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 < b33f76d33aaeacf3baf3370d8d64985169b36600Linux >= 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 < 9808ddffb4bc659352df3020cd84d9d864820ee5Linux >= 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 < 2965787723084835b18dfe993cd450ebf5bd4540Linux 3.9Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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