<em style='font-weight:bold;'>(Description Provided by <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=2011-1751" target="_blank">CVE</a>)</em> : The pciej_write function in hw/acpi_piix4.c in the PIIX4 Power Management emulation in qemu-kvm does not check if a device is hotpluggable before unplugging the PCI-ISA bridge, which allows privileged guest users to cause a denial of service (guest crash) and possibly execute arbitrary code by sending a crafted value to the 0xae08 (PCI_EJ_BASE) I/O port, which leads to a use-after-free related to &quot;active qemu timers.&quot;

Currently, there are no known workarounds or upgrades to correct this issue. However, Gerd Hoffmann has released a patch to address this vulnerability. Check the vendor advisory or solution in the references section.

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• CVE ID: 2011-1751 (see also: NVD)
• Secunia Advisory ID: 44393 44458 44644 44648 44658 44660 44900 51026
• Other Advisory URL: http://blog.nelhage.com/2011/08/breaking-out-of-kvm/
  http://lists.nongnu.org/archive/html/qemu-devel/2011-05/msg01810.html
  http://www.openwall.com/lists/oss-security/2011/05/19/2
  https://github.com/nelhage/virtunoid
  https://hermes.opensuse.org/messages/8572547
• Vendor Specific News/Changelog Entry: http://git.kernel.org/?p=virt/kvm/qemu-kvm.git;a=commit;h=505597e4476a6bc219d0ec1362b760d71cb4fdca
  http://www.gentoo.org/security/en/glsa/glsa-201210-04.xml
• Vendor Specific Advisory URL: http://lists.debian.org/debian-security-announce/2011/msg00110.html
  https://hermes.opensuse.org/messages/8511476
  https://lists.ubuntu.com/archives/ubuntu-security-announce/2011-June/001349.html
• Mail List Post: http://lists.nongnu.org/archive/html/qemu-devel/2011-05/msg01810.html
  http://lists.opensuse.org/opensuse-updates/2011-05/msg00043.html
  http://seclists.org/fulldisclosure/2011/May/464
• RedHat RHSA: RHSA-2011:0534

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