CVE-2026-89918

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreHIGH confidence

Score 9.3 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-16. A secondary CVSS source baseline 9.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.3EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 9.3Exploit: 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:

KVM: arm64: Correctly handle end of VA space TLBI invalidation

Our TLB invalidation by VA code is based on comparing two ranges, one defined by the TLB, and one defined by the TLBI instruction.

Each range is defined by a start and a size. However, the way the comparison is done doesn't account for address rollover, as it compares an address with (base + size). This works nicely until this expression represent the last page/block in the TTBR1 VA space, as the result is a big fat 0. And a failed TLB invalidation.

Rewrite the comparison in a way that is immune to the address rollover (making the end address inclusive instead of exclusive), and move this into a common helper that is used by both VA and IPA invalidations, as suggested by Hyunwoo Kim (although the IPA version didn't suffer from this particular problem, obviously).

CVSS v3
9.3
EG Score
9.3CRITICALhigh confidence
EG Risk
46
EG Risk 46/100CISA 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
Severity93% × 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
8th
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 total (CVSS ≥ 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 (3)

Auto-updated Oct 3, 2026
No patch confirmed yet.
generic

KVM: arm64: Correctly handle end of VA space TLBI invalidation - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ce447651a52ec077694172af10c4fffb11f56c43
generic

KVM: arm64: Correctly handle end of VA space TLBI invalidation - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c624731ca6fe59ad8909ce4108301aa7560a91d6
generic

KVM: arm64: Correctly handle end of VA space TLBI invalidation - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/34af2c3e31f91a739dc175459fdbd99ed952b457

Vendor Advisories for CVE-2026-89918(1)

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

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (178 versions)
  • every version up to 7.2.6-1: fixed in 7.2.6-1
—

Data Freshness Timeline

(refreshed 54× in last 7d / 152× 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 152 total refreshes for this CVE.

  1. 2026-10-05 07:32 UTCGHSA enrichment
  2. 2026-10-05 03:29 UTCGHSA enrichment
  3. 2026-10-04 23:27 UTCEG score recompute
  4. 2026-10-04 23:27 UTCGHSA enrichment
  5. 2026-10-04 23:22 UTCEPSS rescore
  6. 2026-10-04 19:24 UTCGHSA enrichment
  7. 2026-10-04 15:21 UTCGHSA enrichment
  8. 2026-10-04 11:00 UTCGHSA enrichment
  9. 2026-10-04 06:58 UTCGHSA enrichment
  10. 2026-10-04 02:55 UTCGHSA enrichment
  11. 2026-10-03 22:53 UTCGHSA enrichment
  12. 2026-10-03 18:51 UTCEG score recompute
  13. 2026-10-03 18:50 UTCGHSA enrichment
  14. 2026-10-03 14:07 UTCGHSA enrichment
  15. 2026-10-03 10:05 UTCGHSA enrichment
  16. 2026-10-03 06:03 UTCGHSA enrichment
  17. 2026-10-03 02:01 UTCGHSA enrichment
  18. 2026-10-02 21:59 UTCEG score recompute
  19. 2026-10-02 21:59 UTCGHSA enrichment
  20. 2026-10-02 17:56 UTCGHSA enrichment
  21. 2026-10-02 13:54 UTCGHSA enrichment
  22. 2026-10-02 09:44 UTCGHSA enrichment
  23. 2026-10-02 05:42 UTCGHSA enrichment
  24. 2026-10-02 01:32 UTCGHSA enrichment
  25. 2026-10-01 21:30 UTCEG score recompute
Show 75 more
  1. 2026-10-01 21:30 UTCGHSA enrichment
  2. 2026-10-01 19:51 UTCEPSS rescore
  3. 2026-10-01 17:28 UTCGHSA enrichment
  4. 2026-10-01 13:26 UTCGHSA enrichment
  5. 2026-10-01 09:24 UTCGHSA enrichment
  6. 2026-10-01 05:22 UTCGHSA enrichment
  7. 2026-10-01 01:19 UTCGHSA enrichment
  8. 2026-09-30 21:17 UTCGHSA enrichment
  9. 2026-09-30 17:13 UTCEG score recompute
  10. 2026-09-30 17:13 UTCGHSA enrichment
  11. 2026-09-30 15:04 UTCEPSS rescore
  12. 2026-09-30 13:11 UTCGHSA enrichment
  13. 2026-09-30 08:59 UTCGHSA enrichment
  14. 2026-09-30 04:57 UTCGHSA enrichment
  15. 2026-09-30 00:54 UTCGHSA enrichment
  16. 2026-09-29 20:17 UTCGHSA enrichment
  17. 2026-09-29 16:11 UTCEG score recompute
  18. 2026-09-29 16:11 UTCGHSA enrichment
  19. 2026-09-29 12:08 UTCGHSA enrichment
  20. 2026-09-29 08:05 UTCGHSA enrichment
  21. 2026-09-29 03:59 UTCGHSA enrichment
  22. 2026-09-28 23:56 UTCEG score recompute
  23. 2026-09-28 23:56 UTCGHSA enrichment
  24. 2026-09-28 19:53 UTCGHSA enrichment
  25. 2026-09-28 15:49 UTCEG score recompute
  26. 2026-09-28 15:49 UTCGHSA enrichment
  27. 2026-09-28 13:52 UTCEPSS rescore
  28. 2026-09-28 13:52 UTCEPSS rescore
  29. 2026-09-28 11:46 UTCGHSA enrichment
  30. 2026-09-28 07:44 UTCGHSA enrichment
  31. 2026-09-28 03:41 UTCGHSA enrichment
  32. 2026-09-27 23:39 UTCGHSA enrichment
  33. 2026-09-27 19:36 UTCGHSA enrichment
  34. 2026-09-27 15:34 UTCEG score recompute
  35. 2026-09-27 15:34 UTCGHSA enrichment
  36. 2026-09-27 13:49 UTCEPSS rescore
  37. 2026-09-27 11:31 UTCGHSA enrichment
  38. 2026-09-27 07:09 UTCGHSA enrichment
  39. 2026-09-27 03:06 UTCGHSA enrichment
  40. 2026-09-26 23:02 UTCGHSA enrichment
  41. 2026-09-26 19:00 UTCEG score recompute
  42. 2026-09-26 19:00 UTCGHSA enrichment
  43. 2026-09-26 15:59 UTCEPSS rescore
  44. 2026-09-26 14:55 UTCGHSA enrichment
  45. 2026-09-26 10:45 UTCGHSA enrichment
  46. 2026-09-26 06:39 UTCGHSA enrichment
  47. 2026-09-26 02:37 UTCEG score recompute
  48. 2026-09-26 02:37 UTCGHSA enrichment
  49. 2026-09-25 22:34 UTCGHSA enrichment
  50. 2026-09-25 18:25 UTCGHSA enrichment
  51. 2026-09-25 14:19 UTCGHSA enrichment
  52. 2026-09-25 10:15 UTCGHSA enrichment
  53. 2026-09-25 06:13 UTCGHSA enrichment
  54. 2026-09-25 02:11 UTCGHSA enrichment
  55. 2026-09-24 22:08 UTCGHSA enrichment
  56. 2026-09-24 18:06 UTCEG score recompute
  57. 2026-09-24 18:06 UTCGHSA enrichment
  58. 2026-09-24 14:04 UTCEPSS rescore
  59. 2026-09-24 13:41 UTCGHSA enrichment
  60. 2026-09-24 09:39 UTCGHSA enrichment
  61. 2026-09-24 05:36 UTCGHSA enrichment
  62. 2026-09-24 01:33 UTCGHSA enrichment
  63. 2026-09-23 21:31 UTCEG score recompute
  64. 2026-09-23 21:31 UTCGHSA enrichment
  65. 2026-09-23 17:54 UTCEPSS rescore
  66. 2026-09-23 17:28 UTCGHSA enrichment
  67. 2026-09-23 13:24 UTCGHSA enrichment
  68. 2026-09-23 09:22 UTCGHSA enrichment
  69. 2026-09-23 05:20 UTCGHSA enrichment
  70. 2026-09-23 01:18 UTCGHSA enrichment
  71. 2026-09-22 21:15 UTCGHSA enrichment
  72. 2026-09-22 17:13 UTCEG score recompute
  73. 2026-09-22 17:13 UTCGHSA enrichment
  74. 2026-09-22 16:01 UTCEPSS rescore
  75. 2026-09-22 13:11 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-89918?
CVE-2026-89918 is a critical vulnerability published on September 16, 2026. In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Correctly handle end of VA space TLBI invalidation Our TLB invalidation by VA code is based on comparing two ranges, one defined by the TLB, and one defined by the TLBI instruction. Each range is defined by a start and…
When was CVE-2026-89918 disclosed?
CVE-2026-89918 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-2026-89918 actively exploited?
CVE-2026-89918 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-89918?
CVE-2026-89918 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-89918?
No fix for CVE-2026-89918 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-2026-89918 are linked in the Vendor Advisories panel on this page.

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