CVE-2011-1751
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.75%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 2.0
- 7.4 HIGHAV:A/AC:M/Au:S/C:C/I:C/A:C
- EPSS
- 0.75% probability · 53th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- qemu/qemu
- Source
- secalert@redhat.com
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/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
- https://github.com/nelhage/virtunoid
- https://hermes.opensuse.org/messages/8572547
- https://www.ubuntu.com/usn/USN-1145-1/
- 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/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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.