Public Date:
CWE-672 -> CWE-119
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 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

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

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
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 2011-05-19

Affected Packages State

Platform Package State
Red Hat Enterprise Linux Server EUS (v. 6.0) qemu-kvm Affected


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