CVE-2026-89559libnvdimm/labels: Prevent integer overflow in __nd_label_validate()
- 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: libnvdimm/labels: Prevent integer overflow in __nd_label_validate() The on-media namespace index field nslot is a u32 read from the DIMM label storage area. __nd_label_validate() bounds it against the config area size, but sizeof_namespace_label() returns unsigned, so the product nslot * label_size is evaluated in 32-bit and wraps modulo 2^32 before the comparison. A crafted nslot passes the bound and is then used as the loop trip count in nd_label_data_init(), whose memset() walks off the end of the config_size buffer: an out-of-bounds write. The field is not trusted -- it comes from the medium, or from userspace via ND_CMD_SET_CONFIG_DATA. Evaluate the product in 64-bit so the bound check is exact; conforming labels are unaffected. The check was safe when introduced by commit 4a826c83db4e ("libnvdimm: namespace indices: read and validate"): it multiplied by sizeof(struct nd_namespace_label), a size_t, so on a 64-bit build the product did not wrap. Commit 564e871aa66f ("libnvdimm, label: add v1.2 nvdimm label definitions") narrowed it to 32 bits when the label size became a runtime value read via sizeof_namespace_label().
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)
- 0.17% · top 94% of all CVEs (15 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 564e871aa66f548a947b23808d3140f326381f0c – < b4975f2ff6c82adc24ae547f029f82530ba43cfe
- affected 564e871aa66f548a947b23808d3140f326381f0c – < 6030597ec683d1e5b46445f888bb5c7776b5a0c4
- affected 564e871aa66f548a947b23808d3140f326381f0c – < 1c391696d2791f82ae462e11da9a0d96f90b240c
- affected 564e871aa66f548a947b23808d3140f326381f0c – < 93967bfb17dab66642c57e609c99e1a91fe11278
- affected 564e871aa66f548a947b23808d3140f326381f0c – < e057efcc9c71d90099d9ee00bed0748d0e9fd586
- affected 564e871aa66f548a947b23808d3140f326381f0c – < 09e649117c54b7e1c004f22eaa19efbadd9ac856
- affected 564e871aa66f548a947b23808d3140f326381f0c – < 69a734359639fca16a0dd73ab17a34943e76c68b
- affected 564e871aa66f548a947b23808d3140f326381f0c – < 037770686126155eafc44501312989e2837b9659
- affected 4.13
- unaffected < 4.13
- 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/b4975f2ff6c82adc24ae547f029f82530ba43cfe (opens in a new tab)
- https://git.kernel.org/stable/c/6030597ec683d1e5b46445f888bb5c7776b5a0c4 (opens in a new tab)
- https://git.kernel.org/stable/c/1c391696d2791f82ae462e11da9a0d96f90b240c (opens in a new tab)
- https://git.kernel.org/stable/c/93967bfb17dab66642c57e609c99e1a91fe11278 (opens in a new tab)
- https://git.kernel.org/stable/c/e057efcc9c71d90099d9ee00bed0748d0e9fd586 (opens in a new tab)
- https://git.kernel.org/stable/c/09e649117c54b7e1c004f22eaa19efbadd9ac856 (opens in a new tab)
- https://git.kernel.org/stable/c/69a734359639fca16a0dd73ab17a34943e76c68b (opens in a new tab)
- https://git.kernel.org/stable/c/037770686126155eafc44501312989e2837b9659 (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-2026-76470 (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-2026-89559)Record last updated .