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        "text": "Updated kvm packages that fix one security issue and several bugs are now\navailable for Red Hat Enterprise Linux 5.\n\nThis update has been rated as having moderate security impact by the Red\nHat Security Response Team.",
        "title": "Topic"
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      {
        "category": "general",
        "text": "KVM (Kernel-based Virtual Machine) is a full virtualization solution for\nLinux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for\nthe standard Red Hat Enterprise Linux kernel.\n\nOn x86 platforms, the do_insn_fetch() function did not limit the amount of\ninstruction bytes fetched per instruction. Users in guest operating systems\ncould leverage this flaw to cause large latencies on SMP hosts that could\nlead to a local denial of service on the host operating system. This\nupdate fixes this issue by imposing the architecturally-defined 15 byte\nlength limit for instructions. (CVE-2009-4031)\n\nThis update also fixes the following bugs:\n\n* performance problems occurred when using the qcow2 image format with the\nqemu-kvm -drive \"cache=none\" option (the default setting when not specified\notherwise). This could cause guest operating system installations to take\nhours. With this update, performance patches have been backported so that\nusing the qcow2 image format with the \"cache=none\" option no longer causes\nperformance issues. (BZ#520693)\n\n* when using the virtual vm8086 mode, bugs in the emulated hardware task\nswitching implementation may have, in some situations, caused older guest\noperating systems to malfunction. (BZ#532031)\n\n* Windows Server 2003 guests (32-bit) with more than 4GB of memory may have\ncrashed during reboot when using the default qemu-kvm CPU settings.\n(BZ#532043)\n\n* with Red Hat Enterprise Virtualization, guests continued to run after\nencountering disk read errors. This could have led to their file systems\nbecoming corrupted (but not the host\u0027s), notably in environments that use\nnetworked storage. With this update, the qemu-kvm -drive \"werror=stop\"\noption now applies not only to write errors but also to read errors: When\nusing this option, guests will pause on disk read and write errors.\n\nBy default, guests managed by Red Hat Enterprise Virtualization use the\n\"werror=stop\" option. This option is not used by default for guests managed\nby libvirt. (BZ#537334, BZ#540406)\n\n* the para-virtualized block driver (virtio-blk) silently ignored read\nerrors when accessing disk images. With this update, the driver correctly\nsignals the read error to the guest. (BZ#537334)\n\nAll KVM users should upgrade to these updated packages, which contain\nbackported patches to resolve these issues. Note: The procedure in the\nSolution section must be performed before this update will take effect.",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "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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      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "541160"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "The do_insn_fetch function in arch/x86/kvm/emulate.c in the x86 emulator in the KVM subsystem in the Linux kernel before 2.6.32-rc8-next-20091125 tries to interpret instructions that contain too many bytes to be valid, which allows guest OS users to cause a denial of service (increased scheduling latency) on the host OS via unspecified manipulations related to SMP support.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: KVM: x86 emulator: limit instructions to 15 bytes",
          "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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          "summary": "https://www.cve.org/CVERecord?id=CVE-2009-4031",
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          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2009-4031",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2009-4031"
        }
      ],
      "release_date": "2009-11-24T00:00:00+00:00",
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          "date": "2009-12-09T16:28:00+00:00",
          "details": "Before applying this update, make sure that all previously-released\nerrata relevant to your system have been applied.\n\nThis update is available via Red Hat Network. Details on how to use\nthe Red Hat Network to apply this update are available at\nhttp://kbase.redhat.com/faq/docs/DOC-11259\n\nThe following procedure must be performed before this update will take\neffect:\n\n1) Stop all KVM guest virtual machines.\n\n2) Either reboot the hypervisor machine or, as the root user, remove (using\n\"modprobe -r [module]\") and reload (using \"modprobe [module]\") all of the\nfollowing modules which are currently running (determined using \"lsmod\"):\nkvm, ksm, kvm-intel or kvm-amd.\n\n3) Restart the KVM guest virtual machines.",
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            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 2.1,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
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          "details": "Moderate"
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      "title": "kernel: KVM: x86 emulator: limit instructions to 15 bytes"
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    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
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        "url": "https://www.first.org/tlp/"
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    "lang": "en",
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        "category": "summary",
        "text": "An updated rhev-hypervisor package that fixes security issues and several\nbugs is now available.\n\nThis update has been rated as having important security impact by the Red\nHat Security Response Team.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "The rhev-hypervisor package provides a Red Hat Enterprise Virtualization\n(RHEV) Hypervisor ISO disk image. The RHEV Hypervisor is a dedicated\nKernel-based Virtual Machine (KVM) hypervisor. It includes everything\nnecessary to run and manage virtual machines: A subset of the Red Hat\nEnterprise Linux operating environment and the Red Hat Enterprise\nVirtualization Agent.\n\nNote: RHEV Hypervisor is only available for the Intel 64 and AMD64\narchitectures with virtualization extensions.\n\nA flaw was found in the Realtek r8169 Ethernet driver in the Linux kernel.\npci_unmap_single() presented a memory leak that could lead to IOMMU space\nexhaustion and a system crash. An attacker on the local network could\ntrigger this flaw by using jumbo frames for large amounts of network\ntraffic. (CVE-2009-3613)\n\nOn x86 platforms, the do_insn_fetch() function did not limit the amount of\ninstruction bytes fetched per instruction. Users in guest operating systems\ncould leverage this flaw to cause large latencies on SMP hosts that could\nlead to a local denial of service on the host operating system. This update\nfixes this issue by imposing the architecturally-defined 15 byte length\nlimit for instructions. (CVE-2009-4031)\n\nThis updated package provides updated components that include fixes for\nsecurity issues; however, these issues have no security impact for RHEV\nHypervisor. These fixes are for kernel issues CVE-2009-2695, CVE-2009-2908,\nCVE-2009-3228, CVE-2009-3286, CVE-2009-3547, CVE-2009-3612, CVE-2009-3620,\nCVE-2009-3621, and CVE-2009-3726; acpid issue CVE-2009-4033; expat issues\nCVE-2009-3560 and CVE-2009-3720; and wget issue CVE-2009-3490.\n\nThis update also fixes the following bugs:\n\n* the scsi_dh_rdac driver was updated to recognize the Sun StorageTek\nFlexline 380. This driver is now also loaded into initrd to handle passive\npaths correctly. Without this initrd change, lots of errors could occur\nduring boot, increasing boot time. (BZ#545909)\n\n* during the firstboot network configuration of the RHEV Hypervisor, it was\nonly possible to specify NTP servers by their IP addresses if the RHEV\nHypervisor system was configured with a static IP address. With this\nupdate, hostnames can also be used to specify NTP servers. (BZ#545923)\n\n* with the default settings, performance problems occurred when using the\nqcow2 image format. This could cause guest operating system installations\nto take hours. With this update, performance patches have been backported\nto resolve this issue. (BZ#520693)\n\n* when using the virtual vm8086 mode, bugs in the emulated hardware task\nswitching implementation may have, in some situations, caused older guest\noperating systems to malfunction. (BZ#532031)\n\n* Windows Server 2003 guests (32-bit) with more than 4GB of memory may have\ncrashed during reboot when using the default RHEV Hypervisor settings.\n(BZ#532043)\n\n* guests continued to run after encountering disk read errors. This could\nhave led to their file systems becoming corrupted (but not the host\u0027s),\nnotably in environments that use networked storage. With this update,\nguests will now pause on disk read and write errors. (BZ#537334, BZ#540406)\n\n* the para-virtualized block driver (virtio-blk) silently ignored read\nerrors when accessing disk images. With this update, the driver correctly\nsignals the read error to the guest. (BZ#537334)\n\nUsers of the Red Hat Enterprise Virtualization Hypervisor are advised to\nupgrade to this updated package, which corrects these issues.",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "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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          "category": "description",
          "text": "The swiotlb functionality in the r8169 driver in drivers/net/r8169.c in the Linux kernel before 2.6.27.22 allows remote attackers to cause a denial of service (IOMMU space exhaustion and system crash) by using jumbo frames for a large amount of network traffic, as demonstrated by a flood ping.",
          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "kernel: flood ping cause out-of-iommu error and panic when mtu larger than 1500",
          "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"
        }
      ],
      "product_status": {
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          "summary": "Canonical URL",
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        },
        {
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=529137"
        },
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2009-3613",
          "url": "https://www.cve.org/CVERecord?id=CVE-2009-3613"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2009-3613",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2009-3613"
        }
      ],
      "release_date": "2007-11-28T00:00:00+00:00",
      "remediations": [
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          "date": "2009-12-23T14:05:00+00:00",
          "details": "Before applying this update, make sure that all previously-released\nerrata relevant to your system have been applied.\n\nThis update is available via Red Hat Network.  Details on how to use\nthe Red Hat Network to apply this update are available at\nhttp://kbase.redhat.com/faq/docs/DOC-11259",
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            "accessVector": "ADJACENT_NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 6.1,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:A/AC:L/Au:N/C:N/I:N/A:C",
            "version": "2.0"
          },
          "products": [
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          ]
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      ],
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          "details": "Important"
        }
      ],
      "title": "kernel: flood ping cause out-of-iommu error and panic when mtu larger than 1500"
    },
    {
      "cve": "CVE-2009-4031",
      "discovery_date": "2009-11-25T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "541160"
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        },
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          "text": "kernel: KVM: x86 emulator: limit instructions to 15 bytes",
          "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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}