Vulnerability 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."
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Qemu | Qemu | 0.1.0 |
Related Weaknesses (CWE)
References
- http://blog.nelhage.com/2011/08/breaking-out-of-kvm/
- http://git.kernel.org/?p=virt/kvm/qemu-kvm.git%3Ba=commit%3Bh=505597e4476a6bc219
- 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/44393Vendor Advisory
- http://secunia.com/advisories/44458Vendor Advisory
- http://secunia.com/advisories/44648Vendor Advisory
- http://secunia.com/advisories/44658Vendor Advisory
- http://secunia.com/advisories/44660Vendor Advisory
- http://secunia.com/advisories/44900Vendor Advisory
- http://www.openwall.com/lists/oss-security/2011/05/19/2
- http://www.osvdb.org/73395
- http://www.securityfocus.com/bid/47927
- https://bugzilla.redhat.com/show_bug.cgi?id=699773
FAQ
What is CVE-2011-1751?
CVE-2011-1751 is a vulnerability with a CVSS score of 7.4 (HIGH). 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...
How severe is CVE-2011-1751?
CVE-2011-1751 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2011-1751?
Check the references section above for vendor advisories and patch information. Affected products include: Qemu Qemu.