rhsa-2019:4245
Vulnerability from csaf_redhat
Published
2019-12-17 07:36
Modified
2025-02-06 14:02
Summary
Red Hat Security Advisory: kpatch-patch security update

Notes

Topic
An update for kpatch-patch is now available for Red Hat Enterprise Linux 8. 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: * kpatch: hw: incomplete fix for CVE-2018-12207 (CVE-2019-19339) 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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    "notes": [
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        "text": "An update for kpatch-patch is now available for Red Hat Enterprise Linux 8.\n\nRed 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.",
        "title": "Topic"
      },
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        "text": "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.\n\nSecurity Fix:\n\n* kpatch: hw: incomplete fix for CVE-2018-12207 (CVE-2019-19339)\n\nFor 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.",
        "title": "Details"
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        "title": "Terms of Use"
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    "title": "Red Hat Security Advisory: kpatch-patch security update",
    "tracking": {
      "current_release_date": "2025-02-06T14:02:52+00:00",
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        "engine": {
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          "version": "4.3.0"
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      "id": "RHSA-2019:4245",
      "initial_release_date": "2019-12-17T07:36:10+00:00",
      "revision_history": [
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  "vulnerabilities": [
    {
      "cve": "CVE-2019-19339",
      "cwe": {
        "id": "CWE-805",
        "name": "Buffer Access with Incorrect Length Value"
      },
      "discovery_date": "2019-12-11T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1782199"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "It was found that the Red Hat Enterprise Linux 8 kpatch update did not include the complete fix for CVE-2018-12207.\r\n\r\nA 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": "kpatch: hw: incomplete fix for CVE-2018-12207",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/ifu-page-mce",
          "title": "Statement"
        },
        {
          "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"
        }
      ],
      "product_status": {
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          "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-0:1-4.el8.x86_64",
          "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-debuginfo-0:1-4.el8.x86_64",
          "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-debugsource-0:1-4.el8.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2019-19339"
        },
        {
          "category": "external",
          "summary": "RHBZ#1782199",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1782199"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2019-19339",
          "url": "https://www.cve.org/CVERecord?id=CVE-2019-19339"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-19339",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-19339"
        }
      ],
      "release_date": "2019-12-11T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2019-12-17T07:36:10+00:00",
          "details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-0:1-4.el8.src",
            "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-0:1-4.el8.x86_64",
            "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-debuginfo-0:1-4.el8.x86_64",
            "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-debugsource-0:1-4.el8.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2019:4245"
        },
        {
          "category": "workaround",
          "details": "For mitigation related information, please refer to the Red Hat vulnerability article: https://access.redhat.com/security/vulnerabilities/ifu-page-mce .",
          "product_ids": [
            "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-0:1-4.el8.src",
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            "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-debuginfo-0:1-4.el8.x86_64",
            "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-debugsource-0:1-4.el8.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.0"
          },
          "products": [
            "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-0:1-4.el8.src",
            "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-0:1-4.el8.x86_64",
            "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-debuginfo-0:1-4.el8.x86_64",
            "BaseOS-8.1.0.Z.MAIN.EUS:kpatch-patch-4_18_0-147-debugsource-0:1-4.el8.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kpatch: hw: incomplete fix for CVE-2018-12207"
    }
  ]
}


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  • 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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