CVE-2026-89965

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-16. A secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.8Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

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.

CVSS v3
7.8
EG Score
7.8HIGHhigh confidence
EG Risk
40
EG Risk 40/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 16, 2026

Last Modified

September 16, 2026

Advisory Details (8)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

nvdimm/btt: reject an arena whose nfree is below the lane count - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f9bf05c63b77d000e9c01f3e47af36973887d350
generic

nvdimm/btt: reject an arena whose nfree is below the lane count - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f6c5313aae794ecca8f762c1a3493de5c266f120
generic

nvdimm/btt: reject an arena whose nfree is below the lane count - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/eb491343d2d1784121ad9af91c25b338c28913c3
generic

nvdimm/btt: reject an arena whose nfree is below the lane count - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9dfa11cef4750b67591307f2c62e47a23d60e4b7
generic

nvdimm/btt: reject an arena whose nfree is below the lane count - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6f79d1a5f2611a3d36e9312be5425cd9cb397c51
generic

nvdimm/btt: reject an arena whose nfree is below the lane count - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6b1faf1f099f7060b5f1f2f0d024132581f1726e
generic

nvdimm/btt: reject an arena whose nfree is below the lane count - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6a1f2e5ed9267ca19187038ac635393c165213ac
generic

nvdimm/btt: reject an arena whose nfree is below the lane count - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/59d5cd1f42b4bab3609512c3cb3d3540d3d21da7

Vendor Advisories for CVE-2026-89965(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (360 versions)
  • every version on: no fix on record
—
linux-6.126.12.100-1~deb12u1, 6.12.101-1~deb12u1, 6.12.107-1~deb12u1
  • every version up to 6.12.111-1~deb12u1: fixed in 6.12.111-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.12.96-1 (35 versions)
  • every version up to 6.12.111-1: fixed in 6.12.111-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (179 versions)
  • every version up to 7.2.6-1: fixed in 7.2.6-1
—

Data Freshness Timeline

(refreshed 39× in last 7d / 108× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 108 total refreshes for this CVE.

  1. 2026-10-05 06:02 UTCEG score recompute
  2. 2026-10-05 06:02 UTCVendor advisory
  3. 2026-10-05 06:02 UTCGHSA enrichment
  4. 2026-10-04 23:22 UTCEPSS rescore
  5. 2026-10-04 16:58 UTCVendor advisory
  6. 2026-10-04 16:58 UTCGHSA enrichment
  7. 2026-10-04 03:50 UTCVendor advisory
  8. 2026-10-04 03:50 UTCGHSA enrichment
  9. 2026-10-03 14:47 UTCEG score recompute
  10. 2026-10-03 14:47 UTCVendor advisory
  11. 2026-10-03 14:47 UTCGHSA enrichment
  12. 2026-10-03 01:30 UTCEG score recompute
  13. 2026-10-03 01:30 UTCVendor advisory
  14. 2026-10-03 01:30 UTCGHSA enrichment
  15. 2026-10-02 12:26 UTCVendor advisory
  16. 2026-10-02 12:25 UTCGHSA enrichment
  17. 2026-10-01 22:43 UTCEG score recompute
  18. 2026-10-01 22:43 UTCVendor advisory
  19. 2026-10-01 22:43 UTCGHSA enrichment
  20. 2026-10-01 19:51 UTCEPSS rescore
  21. 2026-10-01 09:38 UTCVendor advisory
  22. 2026-10-01 09:38 UTCGHSA enrichment
  23. 2026-09-30 20:34 UTCEG score recompute
  24. 2026-09-30 20:34 UTCVendor advisory
  25. 2026-09-30 20:34 UTCGHSA enrichment
Show 75 more
  1. 2026-09-30 15:04 UTCEPSS rescore
  2. 2026-09-30 07:30 UTCVendor advisory
  3. 2026-09-30 07:30 UTCGHSA enrichment
  4. 2026-09-29 18:26 UTCEG score recompute
  5. 2026-09-29 18:26 UTCVendor advisory
  6. 2026-09-29 18:26 UTCGHSA enrichment
  7. 2026-09-29 05:02 UTCEG score recompute
  8. 2026-09-29 05:02 UTCVendor advisory
  9. 2026-09-29 05:02 UTCGHSA enrichment
  10. 2026-09-28 15:57 UTCEG score recompute
  11. 2026-09-28 15:57 UTCVendor advisory
  12. 2026-09-28 15:57 UTCGHSA enrichment
  13. 2026-09-28 13:52 UTCEPSS rescore
  14. 2026-09-28 13:52 UTCEPSS rescore
  15. 2026-09-28 02:53 UTCVendor advisory
  16. 2026-09-28 02:53 UTCGHSA enrichment
  17. 2026-09-27 13:49 UTCEG score recompute
  18. 2026-09-27 13:49 UTCVendor advisory
  19. 2026-09-27 13:49 UTCGHSA enrichment
  20. 2026-09-27 13:49 UTCEPSS rescore
  21. 2026-09-27 00:42 UTCEG score recompute
  22. 2026-09-27 00:42 UTCVendor advisory
  23. 2026-09-27 00:42 UTCGHSA enrichment
  24. 2026-09-26 15:59 UTCEPSS rescore
  25. 2026-09-26 11:38 UTCEG score recompute
  26. 2026-09-26 11:38 UTCVendor advisory
  27. 2026-09-26 11:38 UTCGHSA enrichment
  28. 2026-09-25 22:34 UTCVendor advisory
  29. 2026-09-25 22:34 UTCGHSA enrichment
  30. 2026-09-25 09:28 UTCVendor advisory
  31. 2026-09-25 09:28 UTCGHSA enrichment
  32. 2026-09-24 20:24 UTCEG score recompute
  33. 2026-09-24 20:24 UTCVendor advisory
  34. 2026-09-24 20:24 UTCGHSA enrichment
  35. 2026-09-24 14:04 UTCEPSS rescore
  36. 2026-09-24 07:19 UTCGHSA enrichment
  37. 2026-09-23 18:15 UTCEG score recompute
  38. 2026-09-23 18:15 UTCVendor advisory
  39. 2026-09-23 18:15 UTCGHSA enrichment
  40. 2026-09-23 17:54 UTCEPSS rescore
  41. 2026-09-23 05:12 UTCVendor advisory
  42. 2026-09-23 05:12 UTCGHSA enrichment
  43. 2026-09-22 16:07 UTCEG score recompute
  44. 2026-09-22 16:07 UTCVendor advisory
  45. 2026-09-22 16:07 UTCGHSA enrichment
  46. 2026-09-22 16:01 UTCEPSS rescore
  47. 2026-09-22 03:03 UTCEG score recompute
  48. 2026-09-22 03:03 UTCVendor advisory
  49. 2026-09-22 03:03 UTCGHSA enrichment
  50. 2026-09-21 21:09 UTCEPSS rescore
  51. 2026-09-21 13:59 UTCVendor advisory
  52. 2026-09-21 13:59 UTCGHSA enrichment
  53. 2026-09-21 00:55 UTCEG score recompute
  54. 2026-09-21 00:55 UTCVendor advisory
  55. 2026-09-21 00:55 UTCGHSA enrichment
  56. 2026-09-20 20:16 UTCEPSS rescore
  57. 2026-09-20 11:50 UTCVendor advisory
  58. 2026-09-20 11:50 UTCGHSA enrichment
  59. 2026-09-19 22:46 UTCEG score recompute
  60. 2026-09-19 22:46 UTCVendor advisory
  61. 2026-09-19 22:46 UTCGHSA enrichment
  62. 2026-09-19 09:42 UTCVendor advisory
  63. 2026-09-19 09:42 UTCGHSA enrichment
  64. 2026-09-18 20:38 UTCEG score recompute
  65. 2026-09-18 20:38 UTCVendor advisory
  66. 2026-09-18 20:38 UTCGHSA enrichment
  67. 2026-09-18 19:28 UTCEPSS rescore
  68. 2026-09-18 07:23 UTCEG score recompute
  69. 2026-09-18 07:23 UTCVendor advisory
  70. 2026-09-18 07:23 UTCGHSA enrichment
  71. 2026-09-17 19:32 UTCEPSS rescore
  72. 2026-09-17 18:19 UTCVendor advisory
  73. 2026-09-17 18:19 UTCGHSA enrichment
  74. 2026-09-17 04:27 UTCEG score recompute
  75. 2026-09-17 04:27 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-89965?
CVE-2026-89965 is a high vulnerability published on September 16, 2026. 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. bttfreelistinit() and bttrttinit() size the per-lane…
When was CVE-2026-89965 disclosed?
CVE-2026-89965 was first published on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89965 actively exploited?
CVE-2026-89965 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-89965?
CVE-2026-89965 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-89965?
No fix for CVE-2026-89965 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-89965 are linked in the Vendor Advisories panel on this page.

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