Vulnerability-Lookup

SUSE-SU-2023:4484-1

Vulnerability from csaf_suse - Published: 2023-11-20 13:22 - Updated: 2023-11-20 13:22

Summary

Security update for xen

Severity

Important

Notes

Title of the patch: Security update for xen

Description of the patch: This update for xen fixes the following issues: - CVE-2023-46835: x86/AMD: mismatch in IOMMU quarantine page table levels (XSA-445) (bsc#1216654). - CVE-2023-46836: x86: BTC/SRSO fixes not fully effective (XSA-446) (bsc#1216807).

Patchnames: SUSE-2023-4484,SUSE-SLE-Product-HPC-15-SP2-LTSS-2023-4484,SUSE-SLE-Product-SLES-15-SP2-LTSS-2023-4484,SUSE-SLE-Product-SLES_SAP-15-SP2-2023-4484

CVE-2023-46835

6.5 (Medium)


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

Affected products

Recommended 18 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS:xen-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS:xen-devel-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS:xen-libs-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS:xen-tools-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS:xen-tools-domU-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS:xen-tools-xendomains-wait-disk-4.13.5_08-150200.3.83.1.noarch	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 15 SP2-LTSS:xen-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 15 SP2-LTSS:xen-devel-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 15 SP2-LTSS:xen-libs-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 15 SP2-LTSS:xen-tools-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 15 SP2-LTSS:xen-tools-domU-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 15 SP2-LTSS:xen-tools-xendomains-wait-disk-4.13.5_08-150200.3.83.1.noarch	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 15 SP2:xen-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 15 SP2:xen-devel-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 15 SP2:xen-libs-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 15 SP2:xen-tools-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 15 SP2:xen-tools-domU-4.13.5_08-150200.3.83.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 15 SP2:xen-tools-xendomains-wait-disk-4.13.5_08-150200.3.83.1.noarch	—	Vendor Fix

Threats

Impact moderate

CVE-2023-46836

5.1 (Medium)


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

Affected products

Recommended 18 products, the same list as for CVE-2023-46835

Threats

Impact moderate

References

12 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-security-upd…	self
https://bugzilla.suse.com/1216654	self
https://bugzilla.suse.com/1216807	self
https://www.suse.com/security/cve/CVE-2023-46835/	self
https://www.suse.com/security/cve/CVE-2023-46836/	self
https://www.suse.com/security/cve/CVE-2023-46835	external
https://bugzilla.suse.com/1216654	external
https://www.suse.com/security/cve/CVE-2023-46836	external
https://bugzilla.suse.com/1216807	external

JSON

To clipboard

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          "text": "The current setup of the quarantine page tables assumes that the\nquarantine domain (dom_io) has been initialized with an address width\nof DEFAULT_DOMAIN_ADDRESS_WIDTH (48) and hence 4 page table levels.\n\nHowever dom_io being a PV domain gets the AMD-Vi IOMMU page tables\nlevels based on the maximum (hot pluggable) RAM address, and hence on\nsystems with no RAM above the 512GB mark only 3 page-table levels are\nconfigured in the IOMMU.\n\nOn systems without RAM above the 512GB boundary\namd_iommu_quarantine_init() will setup page tables for the scratch\npage with 4 levels, while the IOMMU will be configured to use 3 levels\nonly, resulting in the last page table directory (PDE) effectively\nbecoming a page table entry (PTE), and hence a device in quarantine\nmode gaining write access to the page destined to be a PDE.\n\nDue to this page table level mismatch, the sink page the device gets\nread/write access to is no longer cleared between device assignment,\npossibly leading to data leaks.\n",
          "title": "CVE description"
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          "text": "The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative\nReturn Stack Overflow) are not IRQ-safe.  It was believed that the\nmitigations always operated in contexts with IRQs disabled.\n\nHowever, the original XSA-254 fix for Meltdown (XPTI) deliberately left\ninterrupts enabled on two entry paths; one unconditionally, and one\nconditionally on whether XPTI was active.\n\nAs BTC/SRSO and Meltdown affect different CPU vendors, the mitigations\nare not active together by default.  Therefore, there is a race\ncondition whereby a malicious PV guest can bypass BTC/SRSO protections\nand launch a BTC/SRSO attack against Xen.\n",
          "title": "CVE description"
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        }
      ],
      "title": "CVE-2023-46836"
    }
  ]
}

CVE-2023-46835 (GCVE-0-2023-46835)

Vulnerability from cvelistv5 – Published: 2024-01-05 16:34 – Updated: 2025-11-04 19:25

Title

x86/AMD: mismatch in IOMMU quarantine page table levels

Summary

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.

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-04-12 04:00 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

XEN mitre root

References

2 references

URL	Tags
https://xenbits.xenproject.org/xsa/advisory-445.html
http://xenbits.xen.org/xsa/advisory-445.html

Impacted products

1 product

Vendor	Product	Version
Xen	Xen	Unknown: consult Xen advisory XSA-445

Date Public

2023-11-14 12:00

Credits

This issue was discovered by Roger Pau Monné of XenServer.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T19:25:41.611Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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          {
            "tags": [
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            "url": "https://xenbits.xenproject.org/xsa/advisory-445.html"
          },
          {
            "url": "http://xenbits.xen.org/xsa/advisory-445.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "NONE",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
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                "id": "CVE-2023-46835",
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                "timestamp": "2024-04-12T04:00:28.791183Z",
                "version": "2.0.3"
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        "problemTypes": [
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            "descriptions": [
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                "cweId": "CWE-787",
                "description": "CWE-787 Out-of-bounds Write",
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        ],
        "providerMetadata": {
          "dateUpdated": "2025-06-17T16:11:08.422Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
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      "affected": [
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          "defaultStatus": "unknown",
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
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            }
          ]
        }
      ],
      "configurations": [
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          "lang": "en",
          "value": "All Xen versions supporting PCI passthrough are affected.\n\nOnly x86 AMD systems with IOMMU hardware are vulnerable.\n\nOnly x86 guests which have physical devices passed through to them can\nleverage the vulnerability.\n"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "This issue was discovered by Roger Pau Monn\u00e9 of XenServer.\n"
        }
      ],
      "datePublic": "2023-11-14T12:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "The current setup of the quarantine page tables assumes that the\nquarantine domain (dom_io) has been initialized with an address width\nof DEFAULT_DOMAIN_ADDRESS_WIDTH (48) and hence 4 page table levels.\n\nHowever dom_io being a PV domain gets the AMD-Vi IOMMU page tables\nlevels based on the maximum (hot pluggable) RAM address, and hence on\nsystems with no RAM above the 512GB mark only 3 page-table levels are\nconfigured in the IOMMU.\n\nOn systems without RAM above the 512GB boundary\namd_iommu_quarantine_init() will setup page tables for the scratch\npage with 4 levels, while the IOMMU will be configured to use 3 levels\nonly, resulting in the last page table directory (PDE) effectively\nbecoming a page table entry (PTE), and hence a device in quarantine\nmode gaining write access to the page destined to be a PDE.\n\nDue to this page table level mismatch, the sink page the device gets\nread/write access to is no longer cleared between device assignment,\npossibly leading to data leaks.\n"
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "A device in quarantine mode can access data from previous quarantine\npage table usages, possibly leaking data used by previous domains that\nalso had the device assigned.\n"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-01-05T16:34:49.531Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
      },
      "references": [
        {
          "url": "https://xenbits.xenproject.org/xsa/advisory-445.html"
        }
      ],
      "title": "x86/AMD: mismatch in IOMMU quarantine page table levels",
      "workarounds": [
        {
          "lang": "en",
          "value": "Not passing through physical devices to guests will avoid the\nvulnerability.\n\nNot using quarantine scratch-page mode will avoid the vulnerability,\nbut could result in other issues.\n"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
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    "datePublished": "2024-01-05T16:34:49.531Z",
    "dateReserved": "2023-10-27T07:55:35.331Z",
    "dateUpdated": "2025-11-04T19:25:41.611Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2023-46836 (GCVE-0-2023-46836)

Vulnerability from cvelistv5 – Published: 2024-01-05 16:34 – Updated: 2025-11-04 19:25

Title

x86: BTC/SRSO fixes not fully effective

Summary

The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative Return Stack Overflow) are not IRQ-safe. It was believed that the mitigations always operated in contexts with IRQs disabled. However, the original XSA-254 fix for Meltdown (XPTI) deliberately left interrupts enabled on two entry paths; one unconditionally, and one conditionally on whether XPTI was active. As BTC/SRSO and Meltdown affect different CPU vendors, the mitigations are not active together by default. Therefore, there is a race condition whereby a malicious PV guest can bypass BTC/SRSO protections and launch a BTC/SRSO attack against Xen.

Severity

4.7 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-05-08 20:16 UTC

CWE

CWE-noinfo Not enough information

Assigner

XEN mitre root

References

2 references

URL	Tags
https://xenbits.xenproject.org/xsa/advisory-446.html
http://xenbits.xen.org/xsa/advisory-446.html

Impacted products

1 product

Vendor	Product	Version
Xen	Xen	Unknown: consult Xen advisory XSA-446

Date Public

2023-11-14 12:00

Credits

This issue was discovered by Andrew Cooper of XenServer.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T19:25:42.692Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://xenbits.xenproject.org/xsa/advisory-446.html"
          },
          {
            "url": "http://xenbits.xen.org/xsa/advisory-446.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "LOCAL",
              "availabilityImpact": "NONE",
              "baseScore": 4.7,
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              "confidentialityImpact": "HIGH",
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                "id": "CVE-2023-46836",
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                  },
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                    "Technical Impact": "partial"
                  }
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          "dateUpdated": "2025-06-03T14:40:56.728Z",
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        },
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        }
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          "lang": "en",
          "type": "finder",
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      "descriptions": [
        {
          "lang": "en",
          "value": "The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative\nReturn Stack Overflow) are not IRQ-safe.  It was believed that the\nmitigations always operated in contexts with IRQs disabled.\n\nHowever, the original XSA-254 fix for Meltdown (XPTI) deliberately left\ninterrupts enabled on two entry paths; one unconditionally, and one\nconditionally on whether XPTI was active.\n\nAs BTC/SRSO and Meltdown affect different CPU vendors, the mitigations\nare not active together by default.  Therefore, there is a race\ncondition whereby a malicious PV guest can bypass BTC/SRSO protections\nand launch a BTC/SRSO attack against Xen.\n"
        }
      ],
      "impacts": [
        {
          "descriptions": [
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              "lang": "en",
              "value": "An attacker in a PV guest might be able to infer the contents of memory\nbelonging to other guests.\n"
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      "references": [
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          "url": "https://xenbits.xenproject.org/xsa/advisory-446.html"
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      "title": "x86: BTC/SRSO fixes not fully effective",
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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

SUSE-SU-2023:4484-1

CVE-2023-46835 (GCVE-0-2023-46835)

CVE-2023-46836 (GCVE-0-2023-46836)

Tags

Sightings

Nomenclature

Related by attack behaviour