Vulnerability-Lookup

GHSA-Q5P9-3W3F-HR85

Vulnerability from github – Published: 2024-05-01 06:31 – Updated: 2025-09-18 15:30

Details

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

KVM: x86/mmu: Write-protect L2 SPTEs in TDP MMU when clearing dirty status

Check kvm_mmu_page_ad_need_write_protect() when deciding whether to write-protect or clear D-bits on TDP MMU SPTEs, so that the TDP MMU accounts for any role-specific reasons for disabling D-bit dirty logging.

Specifically, TDP MMU SPTEs must be write-protected when the TDP MMU is being used to run an L2 (i.e. L1 has disabled EPT) and PML is enabled. KVM always disables PML when running L2, even when L1 and L2 GPAs are in the some domain, so failing to write-protect TDP MMU SPTEs will cause writes made by L2 to not be reflected in the dirty log.

[sean: massage shortlog and changelog, tweak ternary op formatting]

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

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  "affected": [],
  "aliases": [
    "CVE-2024-26990"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-01T06:15:16Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/mmu: Write-protect L2 SPTEs in TDP MMU when clearing dirty status\n\nCheck kvm_mmu_page_ad_need_write_protect() when deciding whether to\nwrite-protect or clear D-bits on TDP MMU SPTEs, so that the TDP MMU\naccounts for any role-specific reasons for disabling D-bit dirty logging.\n\nSpecifically, TDP MMU SPTEs must be write-protected when the TDP MMU is\nbeing used to run an L2 (i.e. L1 has disabled EPT) and PML is enabled.\nKVM always disables PML when running L2, even when L1 and L2 GPAs are in\nthe some domain, so failing to write-protect TDP MMU SPTEs will cause\nwrites made by L2 to not be reflected in the dirty log.\n\n[sean: massage shortlog and changelog, tweak ternary op formatting]",
  "id": "GHSA-q5p9-3w3f-hr85",
  "modified": "2025-09-18T15:30:21Z",
  "published": "2024-05-01T06:31:42Z",
  "references": [
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26990"
    },
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      "url": "https://git.kernel.org/stable/c/cdf811a937471af2d1facdf8ae80e5e68096f1ed"
    },
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    },
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    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY"
    },
    {
      "type": "WEB",
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  "schema_version": "1.4.0",
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      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-26990 (GCVE-0-2024-26990)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:27 – Updated: 2026-05-11 20:08

Title

KVM: x86/mmu: Write-protect L2 SPTEs in TDP MMU when clearing dirty status

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Write-protect L2 SPTEs in TDP MMU when clearing dirty status Check kvm_mmu_page_ad_need_write_protect() when deciding whether to write-protect or clear D-bits on TDP MMU SPTEs, so that the TDP MMU accounts for any role-specific reasons for disabling D-bit dirty logging. Specifically, TDP MMU SPTEs must be write-protected when the TDP MMU is being used to run an L2 (i.e. L1 has disabled EPT) and PML is enabled. KVM always disables PML when running L2, even when L1 and L2 GPAs are in the some domain, so failing to write-protect TDP MMU SPTEs will cause writes made by L2 to not be reflected in the dirty log. [sean: massage shortlog and changelog, tweak ternary op formatting]

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/cdf811a937471af2d…
https://git.kernel.org/stable/c/e20bff0f1b2de9cfe…
https://git.kernel.org/stable/c/2673dfb591a359c75…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5982a5392663b30f57ee90b0372c19a7e9cb655a , < cdf811a937471af2d1facdf8ae80e5e68096f1ed (git) Affected: 5982a5392663b30f57ee90b0372c19a7e9cb655a , < e20bff0f1b2de9cfe303dd35ff46470104a87404 (git) Affected: 5982a5392663b30f57ee90b0372c19a7e9cb655a , < 2673dfb591a359c75080dd5af3da484b89320d22 (git)
Linux	Linux	Affected: 6.4 Unaffected: 0 , < 6.4 (semver) Unaffected: 6.6.29 , ≤ 6.6.* (semver) Unaffected: 6.8.8 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix)

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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.

Action not permitted

GHSA-Q5P9-3W3F-HR85

CVE-2024-26990 (GCVE-0-2024-26990)

Tags

Sightings

Nomenclature