Vulnerability-Lookup

GHSA-QP35-683C-HFXV

Vulnerability from github – Published: 2024-02-28 09:30 – Updated: 2025-01-09 15:31

Details

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

iommu/vt-d: Remove WO permissions on second-level paging entries

When the first level page table is used for IOVA translation, it only supports Read-Only and Read-Write permissions. The Write-Only permission is not supported as the PRESENT bit (implying Read permission) should always set. When using second level, we still give separate permissions that allows WriteOnly which seems inconsistent and awkward. We want to have consistent behavior. After moving to 1st level, we don't want things to work sometimes, and break if we use 2nd level for the same mappings. Hence remove this configuration.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47035"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-28T09:15:39Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Remove WO permissions on second-level paging entries\n\nWhen the first level page table is used for IOVA translation, it only\nsupports Read-Only and Read-Write permissions. The Write-Only permission\nis not supported as the PRESENT bit (implying Read permission) should\nalways set. When using second level, we still give separate permissions\nthat allows WriteOnly which seems inconsistent and awkward. We want to\nhave consistent behavior. After moving to 1st level, we don\u0027t want things\nto work sometimes, and break if we use 2nd level for the same mappings.\nHence remove this configuration.",
  "id": "GHSA-qp35-683c-hfxv",
  "modified": "2025-01-09T15:31:50Z",
  "published": "2024-02-28T09:30:38Z",
  "references": [
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47035"
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    },
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      "type": "CVSS_V3"
    }
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}

CVE-2021-47035 (GCVE-0-2021-47035)

Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2026-08-05 08:45

Title

iommu/vt-d: Remove WO permissions on second-level paging entries

Summary

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Remove WO permissions on second-level paging entries When the first level page table is used for IOVA translation, it only supports Read-Only and Read-Write permissions. The Write-Only permission is not supported as the PRESENT bit (implying Read permission) should always set. When using second level, we still give separate permissions that allows WriteOnly which seems inconsistent and awkward. We want to have consistent behavior. After moving to 1st level, we don't want things to work sometimes, and break if we use 2nd level for the same mappings. Hence remove this configuration.

Severity

8.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-03-05 18:13 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6843 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/89bd620798704a880…
https://git.kernel.org/stable/c/25faff78138933244…
https://git.kernel.org/stable/c/66c24699f266ff310…
https://git.kernel.org/stable/c/eea53c5816889ee8b…
https://git.kernel.org/stable/c/c848416cc05afc158…	x_transferred

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b802d070a52a1565b47daaa808872cfbd4a17b01 , < 89bd620798704a8805fc9db0d71d7f812cf5b3d2 (git) Affected: b802d070a52a1565b47daaa808872cfbd4a17b01 , < 25faff78138933244c678c7fc78f7c0340fa04a0 (git) Affected: b802d070a52a1565b47daaa808872cfbd4a17b01 , < 66c24699f266ff310381a9552d3576eea8ad6e20 (git) Affected: b802d070a52a1565b47daaa808872cfbd4a17b01 , < eea53c5816889ee8b64544fa2e9311a81184ff9c (git)
Linux	Linux	Affected: 5.6 Unaffected: 0 , < 5.6 (semver) Unaffected: 5.10.38 , ≤ 5.10.* (semver) Unaffected: 5.11.21 , ≤ 5.11.* (semver) Unaffected: 5.12.4 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (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.

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