CVE-2021-47035

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When using second level, we still give separate permissions\nthat allows WriteOnly which seems inconsistent and awkward. We want to\nhave consistent behavior. 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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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iommu/intel/iommu.c"], "versions": [{"version": "b802d070a52a1565b47daaa808872cfbd4a17b01", "lessThan": "89bd620798704a8805fc9db0d71d7f812cf5b3d2", "status": "affected", "versionType": "git"}, {"version": "b802d070a52a1565b47daaa808872cfbd4a17b01", "lessThan": "25faff78138933244c678c7fc78f7c0340fa04a0", "status": "affected", "versionType": "git"}, {"version": "b802d070a52a1565b47daaa808872cfbd4a17b01", "lessThan": "66c24699f266ff310381a9552d3576eea8ad6e20", "status": "affected", "versionType": "git"}, {"version": "b802d070a52a1565b47daaa808872cfbd4a17b01", "lessThan": "eea53c5816889ee8b64544fa2e9311a81184ff9c", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iommu/intel/iommu.c"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.38", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.11.21", "lessThanOrEqual": "5.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.12.4", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.10.38"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.11.21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.12.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.13"}]}]}], "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"}], "title": "iommu/vt-d: Remove WO permissions on second-level paging entries", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47035", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-03-05T18:13:47.892266Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:14:09.941Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:24:39.557Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c", "tags": ["x_transferred"]}]}]}}

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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. 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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't want things\nto work sometimes, and break if we use 2nd level for the same mappings.\nHence remove this configuration."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iommu/vt-d: elimina los permisos WO en las entradas de paginaci\u00f3n de segundo nivel. Cuando la tabla de p\u00e1ginas de primer nivel se utiliza para la traducci\u00f3n IOVA, solo admite permisos de solo lectura y lectura-escritura. . El permiso de s\u00f3lo escritura no se admite ya que el bit PRESENTE (que implica permiso de lectura) siempre debe establecerse. Cuando usamos el segundo nivel, todav\u00eda otorgamos permisos separados que permiten WriteOnly, lo que parece inconsistente e inc\u00f3modo. Queremos tener un comportamiento consistente. Despu\u00e9s de pasar al primer nivel, no queremos que las cosas funcionen a veces y se rompan si usamos el segundo nivel para las mismas asignaciones. Por lo tanto, elimine esta configuraci\u00f3n."}], "id": "CVE-2021-47035", "lastModified": "2026-08-04T10:16:42.190", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47035", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-03-05T18:13:47.892266Z", "version": "2.0.3"}}]}, "published": "2024-02-28T09:15:39.757", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: iommu/vt-d: Remove WO permissions on second-level paging entries", "id": "2266992", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266992"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\niommu/vt-d: Remove WO permissions on second-level paging entries\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't want things\nto work sometimes, and break if we use 2nd level for the same mappings.\nHence remove this configuration."], "name": "CVE-2021-47035", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-02-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47035\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47035\nhttps://lore.kernel.org/linux-cve-announce/2024022836-CVE-2021-47035-e152@gregkh/T/#u"], "threat_severity": "Low"}

{}