CVE Database


Impact: Important
Public: 2011-05-18
CWE: CWE-672->CWE-119
Bugzilla: 699773: CVE-2011-1751 qemu: acpi_piix4: missing hotplug check during device removal


The MITRE CVE dictionary describes this issue as:

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 "active qemu timers."

Find out more about CVE-2011-1751 from the MITRE CVE dictionary and NIST NVD.


This issue only affects Red Hat Enterprise Linux 6. The version of the qemu/kvm as shipped with Red Hat Enterprise Linux 5 is not affected.

CVSS v2 metrics

Base Score: 7.4
Base Metrics: AV:A/AC:M/Au:S/C:C/I:C/A:C
Access Vector: Adjacent Network
Access Complexity: Medium
Authentication: Single Instance
Confidentiality Impact: Complete
Integrity Impact: Complete
Availability Impact: Complete

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat security errata

Platform Errata Release Date
Red Hat Enterprise Linux version 6 (qemu-kvm) RHSA-2011:0534 May 19, 2011

External References


Red Hat would like to thank Nelson Elhage for reporting this issue.

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For clarification or corrections please contact the Red Hat Security Response Team.