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Fencer Intel
high 7.4

CVE-2011-1751 json

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…

published 2012-06-21 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-1750

cvss
7.4
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

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."

Patch / fix

  • qemu-kvm RHEL 6 2:0.12.1.2-2.160.el6
  • qemu-img RHEL 6 2:0.12.1.2-2.160.el6
  • qemu-kvm-tools RHEL 6 2:0.12.1.2-2.160.el6

red hat advisories RHSA-2011:0534

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-1751 updated cvss 7.4

qemu: acpi_piix4: missing hotplug check during device removal

  • Red Hat Enterprise Linux Desktop (v. 6) qemu-img 0.12.1.2-2.160.el6, qemu-kvm 0.12.1.2-2.160.el6, qemu-kvm-tools 0.12.1.2-2.160.el6 Red Hat Enterprise Linux HPC Node (v. 6) qemu-img 0.12.1.2-2.160.el6, qemu-kvm 0.12.1.2-2.160.el6, qemu-kvm-tools 0.12.1.2-2.160.el6 Red Hat Enterprise Linux Server (v. 6) qemu-img 0.12.1.2-2.160.el6, qemu-kvm 0.12.1.2-2.160.el6, qemu-kvm-tools 0.12.1.2-2.160.el6 Red Hat Enterprise Linux Workstation (v. 6) qemu-img 0.12.1.2-2.160.el6, qemu-kvm 0.12.1.2-2.160.el6, qemu-kvm-tools 0.12.1.2-2.160.el6
    fixed: vendor fix RHSA-2011:0534

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.74% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 7.4 AV:A/AC:M/Au:S/C:C/I:C/A:C

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.