rhsa-2020_0028
Vulnerability from csaf_redhat
Published
2020-01-06 14:46
Modified
2024-11-15 03:19
Summary
Red Hat Security Advisory: kpatch-patch security update

Notes

Topic
An update for kpatch-patch is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel. Security Fix(es): * hw: Machine Check Error on Page Size Change (IFU) (CVE-2018-12207) * hw: TSX Transaction Asynchronous Abort (TAA) (CVE-2019-11135) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Intel"
          ]
        },
        {
          "names": [
            "Deepak Gupta"
          ],
          "summary": "Acknowledged by upstream."
        }
      ],
      "cve": "CVE-2018-12207",
      "cwe": {
        "id": "CWE-226",
        "name": "Sensitive Information in Resource Not Removed Before Reuse"
      },
      "discovery_date": "2018-11-06T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1646768"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the way Intel CPUs handle inconsistency between, virtual to physical memory address translations in CPU\u0027s local cache and system software\u0027s Paging structure entries. A privileged guest user may use this flaw to induce a hardware Machine Check Error on the host processor, resulting in a severe DoS scenario by halting the processor.\r\n\r\nSystem software like OS OR Virtual Machine Monitor (VMM) use virtual memory system for storing program instructions and data in memory.  Virtual Memory system uses Paging structures like Page Tables and Page Directories to manage system memory. The processor\u0027s Memory Management Unit (MMU) uses Paging structure entries to translate program\u0027s  virtual memory addresses to physical memory addresses. The processor stores these address translations into its local cache buffer called - Translation Lookaside Buffer (TLB).  TLB has two parts, one for instructions and other for data addresses.\r\n\r\nSystem software can modify its Paging structure entries to change address mappings OR certain attributes like page size etc. Upon such Paging structure alterations in memory, system software must invalidate the corresponding address translations in the processor\u0027s TLB cache. But before this TLB invalidation takes place, a privileged guest user may trigger an instruction fetch operation, which could use an already cached, but now invalid, virtual to physical address translation from Instruction TLB (ITLB). Thus accessing an invalid physical memory address and resulting in halting the processor due to the Machine Check Error (MCE) on Page Size Change.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "hw: Machine Check Error on Page Size Change (IFU)",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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          "title": "Vulnerability description"
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          "text": "hw: TSX Transaction Asynchronous Abort (TAA)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
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          "title": "Statement"
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        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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      "title": "hw: TSX Transaction Asynchronous Abort (TAA)"
    }
  ]
}


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