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ubuntu-cve-2023-46835
Vulnerability from osv_ubuntu
Published
2024-01-05 17:15
Modified
2026-05-20 15:02
Summary
Details

The current setup of the quarantine page tables assumes that the quarantine domain (dom_io) has been initialized with an address width of DEFAULT_DOMAIN_ADDRESS_WIDTH (48) and hence 4 page table levels. However dom_io being a PV domain gets the AMD-Vi IOMMU page tables levels based on the maximum (hot pluggable) RAM address, and hence on systems with no RAM above the 512GB mark only 3 page-table levels are configured in the IOMMU. On systems without RAM above the 512GB boundary amd_iommu_quarantine_init() will setup page tables for the scratch page with 4 levels, while the IOMMU will be configured to use 3 levels only, resulting in the last page table directory (PDE) effectively becoming a page table entry (PTE), and hence a device in quarantine mode gaining write access to the page destined to be a PDE. Due to this page table level mismatch, the sink page the device gets read/write access to is no longer cleared between device assignment, possibly leading to data leaks.


{
  "affected": [
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          },
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          },
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          },
          {
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          },
          {
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          },
          {
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          {
            "binary_name": "libxendevicemodel1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "libxenevtchn1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "libxenforeignmemory1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "libxengnttab1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "libxenhypfs1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "libxenmisc4.20",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "libxenstore4",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "libxentoolcore1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "libxentoollog1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "xen-hypervisor-4.20-amd64",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "xen-hypervisor-4.20-arm64",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "xen-hypervisor-common",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "xen-system-amd64",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "xen-system-arm64",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "xen-utils-4.20",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "xen-utils-common",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "xenstore-utils",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "xen",
        "purl": "pkg:deb/ubuntu/xen@4.20.2+7-g1badcf5035-2build2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.20.0+68-g35cb38b222-1",
        "4.20.2+7-g1badcf5035-2",
        "4.20.2+7-g1badcf5035-2build2"
      ]
    }
  ],
  "aliases": [],
  "details": "The current setup of the quarantine page tables assumes that the quarantine domain (dom_io) has been initialized with an address width of DEFAULT_DOMAIN_ADDRESS_WIDTH (48) and hence 4 page table levels. However dom_io being a PV domain gets the AMD-Vi IOMMU page tables levels based on the maximum (hot pluggable) RAM address, and hence on systems with no RAM above the 512GB mark only 3 page-table levels are configured in the IOMMU. On systems without RAM above the 512GB boundary amd_iommu_quarantine_init() will setup page tables for the scratch page with 4 levels, while the IOMMU will be configured to use 3 levels only, resulting in the last page table directory (PDE) effectively becoming a page table entry (PTE), and hence a device in quarantine mode gaining write access to the page destined to be a PDE. Due to this page table level mismatch, the sink page the device gets read/write access to is no longer cleared between device assignment, possibly leading to data leaks.",
  "id": "UBUNTU-CVE-2023-46835",
  "modified": "2026-05-20T15:02:55Z",
  "published": "2024-01-05T17:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-46835"
    },
    {
      "type": "REPORT",
      "url": "https://xenbits.xen.org/xsa/advisory-445.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-46835"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2023-46835"
  ]
}



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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.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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