CVE-2026-89574dm array: validate array block headers on read
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 49 days later
· 49 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < e09d8b34ed199c8b7d7528c2b8324aa7cff712f8
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < 0e3b8f371c385c212b6e6f76c66f5b3f5bcfea62
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < 67adda7ed5da3e3b64f5b9021a02c21fb374fd9c
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < b33f76d33aaeacf3baf3370d8d64985169b36600
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < 9808ddffb4bc659352df3020cd84d9d864820ee5
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < 2965787723084835b18dfe993cd450ebf5bd4540
- affected 3.9
- unaffected < 3.9
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/e09d8b34ed199c8b7d7528c2b8324aa7cff712f8 (opens in a new tab)
- https://git.kernel.org/stable/c/0e3b8f371c385c212b6e6f76c66f5b3f5bcfea62 (opens in a new tab)
- https://git.kernel.org/stable/c/67adda7ed5da3e3b64f5b9021a02c21fb374fd9c (opens in a new tab)
- https://git.kernel.org/stable/c/b33f76d33aaeacf3baf3370d8d64985169b36600 (opens in a new tab)
- https://git.kernel.org/stable/c/9808ddffb4bc659352df3020cd84d9d864820ee5 (opens in a new tab)
- https://git.kernel.org/stable/c/2965787723084835b18dfe993cd450ebf5bd4540 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76486 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89574)Record last updated .