- 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: nvdimm/btt: reject an arena whose nfree is below the lane count The BTT info block's nfree field, the number of reserve free blocks, is read from the medium without validation. btt_freelist_init() and btt_rtt_init() size the per-lane freelist[] and rtt[] arrays by nfree, but the I/O path indexes them by the lane from nd_region_acquire_lane(), which is bounded by nd_region->num_lanes (ND_MAX_LANES), not by nfree. A crafted or foreign arena whose nfree is below the lane count makes freelist[lane]/rtt[lane] run past the allocation: an out-of-bounds write. btt.rst documents the nlanes = min(nfree, num_cpus) invariant, which the code does not currently honor: num_lanes is ND_MAX_LANES regardless of nfree. Reject an arena whose nfree is below num_lanes at discovery, before the per-lane arrays are allocated, enforcing that invariant.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 33 days later
· 33 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 (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 5212e11fde4d40fa627668b4f2222d20db488f71 – < eb491343d2d1784121ad9af91c25b338c28913c3
- affected 5212e11fde4d40fa627668b4f2222d20db488f71 – < 59d5cd1f42b4bab3609512c3cb3d3540d3d21da7
- affected 5212e11fde4d40fa627668b4f2222d20db488f71 – < f6c5313aae794ecca8f762c1a3493de5c266f120
- affected 5212e11fde4d40fa627668b4f2222d20db488f71 – < f9bf05c63b77d000e9c01f3e47af36973887d350
- affected 5212e11fde4d40fa627668b4f2222d20db488f71 – < 6f79d1a5f2611a3d36e9312be5425cd9cb397c51
- affected 5212e11fde4d40fa627668b4f2222d20db488f71 – < 6b1faf1f099f7060b5f1f2f0d024132581f1726e
- affected 5212e11fde4d40fa627668b4f2222d20db488f71 – < 9dfa11cef4750b67591307f2c62e47a23d60e4b7
- affected 5212e11fde4d40fa627668b4f2222d20db488f71 – < 6a1f2e5ed9267ca19187038ac635393c165213ac
- affected 4.2
- unaffected < 4.2
- 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 6.12.110 – ≤ 6.12.*
- unaffected 6.18.51 – ≤ 6.18.*
- unaffected 7.2.5 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/eb491343d2d1784121ad9af91c25b338c28913c3 (opens in a new tab)
- https://git.kernel.org/stable/c/59d5cd1f42b4bab3609512c3cb3d3540d3d21da7 (opens in a new tab)
- https://git.kernel.org/stable/c/f6c5313aae794ecca8f762c1a3493de5c266f120 (opens in a new tab)
- https://git.kernel.org/stable/c/f9bf05c63b77d000e9c01f3e47af36973887d350 (opens in a new tab)
- https://git.kernel.org/stable/c/6f79d1a5f2611a3d36e9312be5425cd9cb397c51 (opens in a new tab)
- https://git.kernel.org/stable/c/6b1faf1f099f7060b5f1f2f0d024132581f1726e (opens in a new tab)
- https://git.kernel.org/stable/c/9dfa11cef4750b67591307f2c62e47a23d60e4b7 (opens in a new tab)
- https://git.kernel.org/stable/c/6a1f2e5ed9267ca19187038ac635393c165213ac (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-2026-80565 (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-2026-89965)Record last updated .