suse-su-2023:4466-1
Vulnerability from csaf_suse
Published
2023-11-16 16:57
Modified
2023-11-16 16:57
Summary
Security update for xen

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-2023-4466,SUSE-SLE-Product-HPC-15-SP3-ESPOS-2023-4466,SUSE-SLE-Product-HPC-15-SP3-LTSS-2023-4466,SUSE-SLE-Product-SLES-15-SP3-LTSS-2023-4466,SUSE-SLE-Product-SLES_SAP-15-SP3-2023-4466,SUSE-SUSE-MicroOS-5.1-2023-4466,SUSE-SUSE-MicroOS-5.2-2023-4466,SUSE-Storage-7.1-2023-4466
Terms of use
CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).



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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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            "version": "3.1"
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2023-11-16T16:57:09Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2023-46835"
    },
    {
      "cve": "CVE-2023-46836",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2023-46836"
        }
      ],
      "notes": [
        {
          "category": "general",
          "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"
        }
      ],
      "product_status": {
        "recommended": [
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        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2023-46836",
          "url": "https://www.suse.com/security/cve/CVE-2023-46836"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1216807 for CVE-2023-46836",
          "url": "https://bugzilla.suse.com/1216807"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
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          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2023-11-16T16:57:09Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2023-46836"
    }
  ]
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
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