rhsa-2015_2645
Vulnerability from csaf_redhat
Published
2015-12-15 14:36
Modified
2024-11-05 19:09
Summary
Red Hat Security Advisory: kernel security and bug fix update

Notes

Topic
Updated kernel packages that fix two security issues and two bugs are now available for Red Hat Enterprise Linux 6.5 Advanced Update Support. Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.
Details
The kernel packages contain the Linux kernel, the core of any Linux operating system. * It was found that the x86 ISA (Instruction Set Architecture) is prone to a denial of service attack inside a virtualized environment in the form of an infinite loop in the microcode due to the way (sequential) delivering of benign exceptions such as #AC (alignment check exception) and #DB (debug exception) is handled. A privileged user inside a guest could use these flaws to create denial of service conditions on the host kernel. (CVE-2015-5307, CVE-2015-8104, Important) Red Hat would like to thank Ben Serebrin of Google Inc. for reporting the CVE-2015-5307 issue. This update also fixes the following bugs: * With an IPv6 address on a bond and a slave failover, Unsolicited Neighbor Advertisement (UNA) was previously sent using the link global IPv6 address as source address. The underlying source code has been patched, and, after the failover in bonding, UNA is sent using both the corresponding link IPv6 address and global IPv6 address of bond0 and bond0.vlan. (BZ#1258479) * Previously, Human Interface Device (HID) would run a report on an unaligned buffer, which could cause a page fault interrupt and an oops when the end of the report was read. This update fixes this bug by padding the end of the report with extra bytes, so the reading of the report never crosses a page boundary. As a result, a page fault and subsequent oops no longer occur. (BZ#1268201) All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.
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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        "text": "Updated kernel packages that fix two security issues and two bugs are now\navailable for Red Hat Enterprise Linux 6.5 Advanced Update Support.\n\nRed Hat Product Security has rated this update as having Important security\nimpact. Common Vulnerability Scoring System (CVSS) base scores, which give\ndetailed severity ratings, are available for each vulnerability from the\nCVE links in the References section.",
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        "text": "The kernel packages contain the Linux kernel, the core of any Linux\noperating system.\n\n* It was found that the x86 ISA (Instruction Set Architecture) is prone to\na denial of service attack inside a virtualized environment in the form of\nan infinite loop in the microcode due to the way (sequential) delivering of\nbenign exceptions such as #AC (alignment check exception) and #DB (debug\nexception) is handled. A privileged user inside a guest could use these\nflaws to create denial of service conditions on the host kernel.\n(CVE-2015-5307, CVE-2015-8104, Important)\n\nRed Hat would like to thank Ben Serebrin of Google Inc. for reporting the\nCVE-2015-5307 issue.\n\nThis update also fixes the following bugs:\n\n* With an IPv6 address on a bond and a slave failover, Unsolicited Neighbor\nAdvertisement (UNA) was previously sent using the link global IPv6 address\nas source address. The underlying source code has been patched, and, after\nthe failover in bonding, UNA is sent using both the corresponding link IPv6\naddress and global IPv6 address of bond0 and bond0.vlan. (BZ#1258479)\n\n* Previously, Human Interface Device (HID) would run a report on an\nunaligned buffer, which could cause a page fault interrupt and an oops when\nthe end of the report was read. This update fixes this bug by padding the\nend of the report with extra bytes, so the reading of the report never\ncrosses a page boundary. As a result, a page fault and subsequent oops no\nlonger occur. (BZ#1268201)\n\nAll kernel users are advised to upgrade to these updated packages, which\ncontain backported patches to correct these issues. The system must be\nrebooted for this update to take effect.",
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          "text": "It was found that the x86 ISA (Instruction Set Architecture) is prone to a denial of service attack inside a virtualized environment in the form of an infinite loop in the microcode due to the way (sequential) delivering of benign exceptions such as #AC (alignment check exception) is handled. A privileged user inside a guest could use this flaw to create denial of service conditions on the host kernel.",
          "title": "Vulnerability description"
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          "text": "virt: guest to host DoS by triggering an infinite loop in microcode via #AC exception",
          "title": "Vulnerability summary"
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        {
          "category": "other",
          "text": "This issue affects the version of the kvm and xen packages as shipped with Red Hat Enterprise Linux 5.\n\nThis issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.\n\nThis issue affects the version of Linux kernel as shipped with Red Hat Enterprise Linux 6 and 7. Future kernel updates for the respective releases may address this issue.\n\nRed Hat Enterprise Linux 5 is now in Production Phase 3 of the support and maintenance life cycle. Thus it is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.",
          "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.",
          "title": "CVSS score applicability"
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
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      "title": "virt: guest to host DoS by triggering an infinite loop in microcode via #AC exception"
    },
    {
      "cve": "CVE-2015-8104",
      "cwe": {
        "id": "CWE-835",
        "name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
      },
      "discovery_date": "2015-11-04T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1278496"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "It was found that the x86 ISA (Instruction Set Architecture) is prone to a denial of service attack inside a virtualized environment in the form of an infinite loop in the microcode due to the way (sequential) delivering of benign exceptions such as #DB (debug exception) is handled. A privileged user inside a guest could use this flaw to create denial of service conditions on the host kernel.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "virt: guest to host DoS by triggering an infinite loop in microcode via #DB exception",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue affects the version of the kvm \u0026 xen packages as shipped with Red Hat Enterprise Linux 5.\n\nThis issue does not affect the versions of the kernel package as shipped with\nRed Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.\n\nThis issue affects the version of Linux kernel as shipped with\nRed Hat Enterprise Linux 6 and 7. Future kernel updates for the respective releases may address this issue.\n\nRed Hat Enterprise Linux 5 is now in Production Phase 3 of the support and\nmaintenance life cycle. Thus it is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.",
          "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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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2015-8104"
        },
        {
          "category": "external",
          "summary": "RHBZ#1278496",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1278496"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2015-8104",
          "url": "https://www.cve.org/CVERecord?id=CVE-2015-8104"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2015-8104",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2015-8104"
        }
      ],
      "release_date": "2015-11-10T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2015-12-15T14:36:40+00:00",
          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "title": "virt: guest to host DoS by triggering an infinite loop in microcode via #DB exception"
    }
  ]
}


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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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