CVE-2026-89573dm array: reject an array block whose value size is not the caller's
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% 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: reject an array block whose value size is not the caller's array_block_check() can only compare the header against itself, so a block with value_size 4 and max_entries 1018 is internally consistent and passes. dm-cache keeps two arrays -- mappings at 8 bytes and hints at 4 -- and the roots for both live in the superblock. Point the mappings root at a hint block and __load_mappings() walks it through an info whose value size is 8, so element_at() strides 8 bytes over 4-byte entries and reaches offset 8160 of a 4096-byte block. get_ablock() and __shadow_ablock() are the two places that hold the block and the caller at once. Reject there when the two value sizes disagree. Arrays only ever read their own blocks, so this fires on crafted metadata only.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 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)
- 0.13% · top 97% of all CVEs (12 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 – < 35cd3b278448c79614f65ab6bbc9ed348d847df9
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < a8237cb8fa0a628d903e76635bfdeae4202036b9
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < a530a9a419a7c5fdb7dae55ffa2dd7a130631842
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < 522fa26da24ccaa298ebe3c1c97395d2d63dfc21
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < 7bf4b5cb42a4e27f36bcbc6209d82a5da9c0168c
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < ac4a5eb8b002a0742c938fc98b922e243f53573a
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < cb409b38b0232ee4385ef55cddcd6fbdd011a8a2
- affected 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 – < 4538a287bdf5d0f9a379c678e5262b9f5783f547
- affected 3.9
- unaffected < 3.9
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/35cd3b278448c79614f65ab6bbc9ed348d847df9 (opens in a new tab)
- https://git.kernel.org/stable/c/a8237cb8fa0a628d903e76635bfdeae4202036b9 (opens in a new tab)
- https://git.kernel.org/stable/c/a530a9a419a7c5fdb7dae55ffa2dd7a130631842 (opens in a new tab)
- https://git.kernel.org/stable/c/522fa26da24ccaa298ebe3c1c97395d2d63dfc21 (opens in a new tab)
- https://git.kernel.org/stable/c/7bf4b5cb42a4e27f36bcbc6209d82a5da9c0168c (opens in a new tab)
- https://git.kernel.org/stable/c/ac4a5eb8b002a0742c938fc98b922e243f53573a (opens in a new tab)
- https://git.kernel.org/stable/c/cb409b38b0232ee4385ef55cddcd6fbdd011a8a2 (opens in a new tab)
- https://git.kernel.org/stable/c/4538a287bdf5d0f9a379c678e5262b9f5783f547 (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-2026-76485 (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-2026-89573)Record last updated .