Vulnerability-Lookup

CVE-2026-64555 (GCVE-0-2026-64555)

Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-07-27 20:10

Title

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

Summary

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.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/10a568010e827108d…
https://git.kernel.org/stable/c/884b44256041ec6b2…
https://git.kernel.org/stable/c/dd3b237eb7780d65e…
https://git.kernel.org/stable/c/ff1022c3de46753eb…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 2de451a329cf662beeba71f63c7f83ee24ca6642 , < 10a568010e827108d149779908850afaec898846 (git) Affected: 2de451a329cf662beeba71f63c7f83ee24ca6642 , < 884b44256041ec6b2dcbe8e6a67384d26145cba1 (git) Affected: 2de451a329cf662beeba71f63c7f83ee24ca6642 , < dd3b237eb7780d65eae296d3d3a70012b6e7a02f (git) Affected: 2de451a329cf662beeba71f63c7f83ee24ca6642 , < ff1022c3de46753eb7eba2f6efd990569e66ff95 (git)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2-rc4 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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          "programFiles": [
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    "datePublished": "2026-07-27T20:10:42.259Z",
    "dateReserved": "2026-07-19T15:36:31.796Z",
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  }
}

GHSA-MH5J-7PGC-M97G

Vulnerability from github – Published: 2026-07-27 21:31 – Updated: 2026-07-27 21:31

Details

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.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64555"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-27T21:17:08Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()\n\nkvm_hyp_handle_mops() resets the single-step state machine as part of\nrewinding state for a MOPS exception by modifying vcpu_cpsr() and\nwriting the result directly into hardware.\n\nIn the case of nested virtualization, vcpu_cpsr() is a synthetic value\nsuch that the rest of KVM can deal with vEL2 cleanly. That means the\nvalue requires translation before being written into hardware, which is\nunfortunately missing from the MOPS handler.\n\nFix it by directly modifying SPSR_EL2 and avoiding the synthetic state\naltogether, which will be resynchronized on the next \u0027full\u0027 exit back\nto KVM.",
  "id": "GHSA-mh5j-7pgc-m97g",
  "modified": "2026-07-27T21:31:27Z",
  "published": "2026-07-27T21:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64555"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10a568010e827108d149779908850afaec898846"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/884b44256041ec6b2dcbe8e6a67384d26145cba1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd3b237eb7780d65eae296d3d3a70012b6e7a02f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff1022c3de46753eb7eba2f6efd990569e66ff95"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64555 (GCVE-0-2026-64555)

GHSA-MH5J-7PGC-M97G

Tags

Sightings

Nomenclature