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

Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2026-08-05 08:45
VLAI
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 (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b802d070a52a1565b47daaa808872cfbd4a17b01 , < 89bd620798704a8805fc9db0d71d7f812cf5b3d2 (git)
Affected: b802d070a52a1565b47daaa808872cfbd4a17b01 , < 25faff78138933244c678c7fc78f7c0340fa04a0 (git)
Affected: b802d070a52a1565b47daaa808872cfbd4a17b01 , < 66c24699f266ff310381a9552d3576eea8ad6e20 (git)
Affected: b802d070a52a1565b47daaa808872cfbd4a17b01 , < eea53c5816889ee8b64544fa2e9311a81184ff9c (git)
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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)
Create a notification for this product.
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Por lo tanto, elimine esta 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T23:04:44+00:00",
      "cve": "CVE-2021-47035",
      "id": "CVE-2021-47035",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: iommu/vt-d: Remove WO permissions on second-level paging entries",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47035.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-06T02:08:51Z",
      "cve": "CVE-2021-47035",
      "id": "CVE-2021-47035",
      "initial_release_date": "2024-03-01T04:07:52Z",
      "product_status:known_affected": "388",
      "product_status:known_not_affected": "256",
      "product_status:recommended": "91",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47035",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47035.json",
      "version": "41"
    },
    "vulnrichment": {
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no race or attacker-uncontrollable hardware state is required.\\nPR:L - Ordinary unprivileged I/O triggers kernel DMA_FROM_DEVICE maps, and VFIO/iommufd device assignment is gated by device-file permissions rather than init-namespace root, so low privileges suffice.\\nUI:N - The attacker (or their assigned device/VMM) drives the mapping and DMA themselves; no separate victim action is required.\\nS:C - Incorrect second- vs first-level PTE permission bits weaken or break the IOMMU DMA isolation boundary, so a device can obtain access rights different from those requested and reach memory outside the intended domain authority.\\nC:H - Forcing PRESENT/READ on intended write-only DMA_FROM_DEVICE pages (FL behavior, and the inconsistency with SL) lets a malicious or guest-assigned device DMA-read host buffer contents that should have been write-only.\\nI:H - Wrong IOMMU PTE permissions corrupt the DMA access-control mechanism itself and can allow device DMA writes under unintended effective rights, yielding an integrity compromise across the isolation boundary.\\nA:H - The fix commit states SL WO mappings can break where FL worked, producing IOMMU/DMA faults, dead devices, or kernel fault handling that denies availability.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"b802d070a52a1565b47daaa808872cfbd4a17b01\", \"lessThan\": \"89bd620798704a8805fc9db0d71d7f812cf5b3d2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b802d070a52a1565b47daaa808872cfbd4a17b01\", \"lessThan\": \"25faff78138933244c678c7fc78f7c0340fa04a0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b802d070a52a1565b47daaa808872cfbd4a17b01\", \"lessThan\": \"66c24699f266ff310381a9552d3576eea8ad6e20\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b802d070a52a1565b47daaa808872cfbd4a17b01\", \"lessThan\": \"eea53c5816889ee8b64544fa2e9311a81184ff9c\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/iommu/intel/iommu.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.38\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/iommu/intel/iommu.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2\"}, {\"url\": \"https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0\"}, {\"url\": \"https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20\"}, {\"url\": \"https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.38\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.21\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.4\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:45:38.812Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47035\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:45:38.812Z\", \"dateReserved\": \"2024-02-27T18:42:55.964Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-28T08:13:43.404Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.