suse-su-2022:3728-1
Vulnerability from csaf_suse
Published
2022-10-25 13:40
Modified
2022-10-25 13:40
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-2022-26365: Fixed issue where Linux Block and Network PV device frontends don't zero memory regions before sharing them with the backend (bsc#1200762). - CVE-2022-33740: Fixed issue where Linux Block and Network PV device frontends don't zero memory regions before sharing them with the backend (bsc#1200762). - CVE-2022-33741: Fixed issue where data residing in the same 4K page as data shared with a backend was being accessible by such backend (bsc#1200762). - CVE-2022-33742: Fixed issue where data residing in the same 4K page as data shared with a backend was being accessible by such backend (bsc#1200762). - CVE-2022-33746: Fixed DoS due to excessively long P2M pool freeing (bsc#1203806). - CVE-2021-28689: Fixed speculative vulnerabilities with bare (non-shim) 32-bit PV guests (bsc#1185104). - CVE-2022-33748: Fixed DoS due to race in locking (bsc#1203807).
Patchnames
SUSE-2022-3728,SUSE-SLE-SDK-12-SP5-2022-3728,SUSE-SLE-SERVER-12-SP5-2022-3728
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": "x86: Speculative vulnerabilities with bare (non-shim) 32-bit PV guests 32-bit x86 PV guest kernels run in ring 1. At the time when Xen was developed, this area of the i386 architecture was rarely used, which is why Xen was able to use it to implement paravirtualisation, Xen\u0027s novel approach to virtualization. In AMD64, Xen had to use a different implementation approach, so Xen does not use ring 1 to support 64-bit guests. With the focus now being on 64-bit systems, and the availability of explicit hardware support for virtualization, fixing speculation issues in ring 1 is not a priority for processor companies. Indirect Branch Restricted Speculation (IBRS) is an architectural x86 extension put together to combat speculative execution sidechannel attacks, including Spectre v2. It was retrofitted in microcode to existing CPUs. For more details on Spectre v2, see: http://xenbits.xen.org/xsa/advisory-254.html However, IBRS does not architecturally protect ring 0 from predictions learnt in ring 1. For more details, see: https://software.intel.com/security-software-guidance/deep-dives/deep-dive-indirect-branch-restricted-speculation Similar situations may exist with other mitigations for other kinds of speculative execution attacks. The situation is quite likely to be similar for speculative execution attacks which have yet to be discovered, disclosed, or mitigated.",
          "title": "CVE description"
        }
      ],
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          "category": "external",
          "summary": "CVE-2021-28689",
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        },
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        }
      ],
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          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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          "details": "moderate"
        }
      ],
      "title": "CVE-2021-28689"
    },
    {
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      "ids": [
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          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2022-26365"
        }
      ],
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        {
          "category": "general",
          "text": "Linux disk/nic frontends data leaks T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Linux Block and Network PV device frontends don\u0027t zero memory regions before sharing them with the backend (CVE-2022-26365, CVE-2022-33740). Additionally the granularity of the grant table doesn\u0027t allow sharing less than a 4K page, leading to unrelated data residing in the same 4K page as data shared with a backend being accessible by such backend (CVE-2022-33741, CVE-2022-33742).",
          "title": "CVE description"
        }
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          "title": "CVE description"
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          "category": "general",
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          "title": "CVE description"
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        }
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      ],
      "title": "CVE-2022-33741"
    },
    {
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      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2022-33742"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "Linux disk/nic frontends data leaks T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Linux Block and Network PV device frontends don\u0027t zero memory regions before sharing them with the backend (CVE-2022-26365, CVE-2022-33740). Additionally the granularity of the grant table doesn\u0027t allow sharing less than a 4K page, leading to unrelated data residing in the same 4K page as data shared with a backend being accessible by such backend (CVE-2022-33741, CVE-2022-33742).",
          "title": "CVE description"
        }
      ],
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        {
          "category": "general",
          "text": "P2M pool freeing may take excessively long The P2M pool backing second level address translation for guests may be of significant size. Therefore its freeing may take more time than is reasonable without intermediate preemption checks. Such checking for the need to preempt was so far missing.",
          "title": "CVE description"
        }
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        {
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          "text": "lock order inversion in transitive grant copy handling As part of XSA-226 a missing cleanup call was inserted on an error handling path. While doing so, locking requirements were not paid attention to. As a result two cooperating guests granting each other transitive grants can cause locks to be acquired nested within one another, but in respectively opposite order. With suitable timing between the involved grant copy operations this may result in the locking up of a CPU.",
          "title": "CVE description"
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            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-libs-32bit-4.12.4_28-3.77.1.x86_64",
            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-libs-4.12.4_28-3.77.1.x86_64",
            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-tools-4.12.4_28-3.77.1.x86_64",
            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-tools-domU-4.12.4_28-3.77.1.x86_64",
            "SUSE Linux Enterprise Software Development Kit 12 SP5:xen-devel-4.12.4_28-3.77.1.aarch64",
            "SUSE Linux Enterprise Software Development Kit 12 SP5:xen-devel-4.12.4_28-3.77.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2022-10-25T13:40:54Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2022-33748"
    }
  ]
}


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Taxonomy of the tags.


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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.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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