CVE-2011-1751 Use after free in n/a
Privileged guest users can trigger a use-after-free in QEMU's PIIX4 emulation to crash the guest or execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2011-1751?
CVE-2011-1751 is a high-severity use after free vulnerability in Qemu Qemu, published on 21 Jun 2012. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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."
Weakness: CWE-20
Which versions are affected by CVE-2011-1751?
It affects 1 product.
Products include Qemu Qemu.
How do I fix CVE-2011-1751?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2011-1751 being exploited?
There is no known exploitation of CVE-2011-1751 in the wild and no public exploit code.
Other vulnerabilities in Qemu Qemu
Sources
Also known as DSA-2241-1, GHSA-5x39-mv3c-q6cc.