CVE-2026-64555

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-27. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()

kvm_hyp_handle_mops() resets the single-step state machine as part of rewinding state for a MOPS exception by modifying vcpu_cpsr() and writing the result directly into hardware.

In the case of nested virtualization, vcpu_cpsr() is a synthetic value such that the rest of KVM can deal with vEL2 cleanly. That means the value requires translation before being written into hardware, which is unfortunately missing from the MOPS handler.

Fix it by directly modifying SPSR_EL2 and avoiding the synthetic state altogether, which will be resynchronized on the next 'full' exit back to KVM.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

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
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

July 27, 2026

Last Modified

August 17, 2026

Advisory Details (4)

Auto-updated Jul 30, 2026
No patch confirmed yet.
generic

KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ff1022c3de46753eb7eba2f6efd990569e66ff95
generic

KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dd3b237eb7780d65eae296d3d3a70012b6e7a02f
generic

KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/884b44256041ec6b2dcbe8e6a67384d26145cba1
generic

KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/10a568010e827108d149779908850afaec898846

Vendor Advisories for CVE-2026-64555(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux-6.12—6.12.100-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.96-1 (31 versions)6.12.100-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (157 versions)7.1.5-1—

Data Freshness Timeline

(refreshed 21× in last 7d / 113× 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 128 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64555?
CVE-2026-64555 is a high vulnerability published on July 27, 2026. In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Fix SPSREL2 restore in kvmhyphandlemops() kvmhyphandle_mops() resets the single-step state machine as part of rewinding state for a MOPS exception by modifying vcpu_cpsr() and writing the result directly into…
When was CVE-2026-64555 disclosed?
CVE-2026-64555 was first published in the National Vulnerability Database on July 27, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64555 actively exploited?
CVE-2026-64555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.2% of all scored CVEs.
What is the CVSS score of CVE-2026-64555?
CVE-2026-64555 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-64555?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64555, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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