CVE-2011-1751

Severity: high (CVSS 7.4 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2012-06-21 · updated 2026-06-16
Weakness: CWE-20

Description

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."

Affected products

QEMU: 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5 (+65)

References

http://blog.nelhage.com/2011/08/breaking-out-of-kvm/
http://git.kernel.org/?p=virt/kvm/qemu-kvm.git%3Ba=commit%3Bh=505597e4476a6bc219d0ec1362b760d71cb4fdca
http://lists.nongnu.org/archive/html/qemu-devel/2011-05/msg01810.html
http://lists.opensuse.org/opensuse-updates/2011-05/msg00043.html
http://rhn.redhat.com/errata/RHSA-2011-0534.html
http://secunia.com/advisories/44393
http://secunia.com/advisories/44458
http://secunia.com/advisories/44648
http://secunia.com/advisories/44658
http://secunia.com/advisories/44660
http://secunia.com/advisories/44900
http://www.openwall.com/lists/oss-security/2011/05/19/2

Get alerted when CVE-2011-1751 or the next vulnerability affects your stack