Vulnerability Monitor

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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 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."

Security Impact Summary

CVE-2011-1751 is a security vulnerability that . Impacting 1 product from qemu organizations running these solutions should prioritize assessment and patching.

Historical Context

Documented in 2012, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.

Published

2012-06-21T15:55:09.613

Last Modified

2025-04-11T00:51:21.963

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 7.4 (HIGH)

CVSSv2 Vector

AV:A/AC:M/Au:S/C:C/I:C/A:C

Access Vector: ADJACENT_NETWORK
Access Complexity: MEDIUM
Authentication: SINGLE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

4.4

Impact Score

10.0

Weaknesses

Type: Primary
CWE-20

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	qemu	qemu	0.1.0	Yes
Application	qemu	qemu	0.1.1	Yes
Application	qemu	qemu	0.1.2	Yes
Application	qemu	qemu	0.1.3	Yes
Application	qemu	qemu	0.1.4	Yes
Application	qemu	qemu	0.1.5	Yes
Application	qemu	qemu	0.1.6	Yes
Application	qemu	qemu	0.2.0	Yes
Application	qemu	qemu	0.3.0	Yes
Application	qemu	qemu	0.4.0	Yes
Application	qemu	qemu	0.4.1	Yes
Application	qemu	qemu	0.4.2	Yes
Application	qemu	qemu	0.4.3	Yes
Application	qemu	qemu	0.5.0	Yes
Application	qemu	qemu	0.5.1	Yes
Application	qemu	qemu	0.5.2	Yes
Application	qemu	qemu	0.5.3	Yes
Application	qemu	qemu	0.5.4	Yes
Application	qemu	qemu	0.5.5	Yes
Application	qemu	qemu	0.6.0	Yes
Application	qemu	qemu	0.6.1	Yes
Application	qemu	qemu	0.7.0	Yes
Application	qemu	qemu	0.7.1	Yes
Application	qemu	qemu	0.7.2	Yes
Application	qemu	qemu	0.8.0	Yes
Application	qemu	qemu	0.8.1	Yes
Application	qemu	qemu	0.8.2	Yes
Application	qemu	qemu	0.9.0	Yes
Application	qemu	qemu	0.9.1	Yes
Application	qemu	qemu	0.9.1-5	Yes
Application	qemu	qemu	0.10.0	Yes
Application	qemu	qemu	0.10.1	Yes
Application	qemu	qemu	0.10.2	Yes
Application	qemu	qemu	0.10.3	Yes
Application	qemu	qemu	0.10.4	Yes
Application	qemu	qemu	0.10.5	Yes
Application	qemu	qemu	0.10.6	Yes
Application	qemu	qemu	0.11.0	Yes
Application	qemu	qemu	0.11.0	Yes
Application	qemu	qemu	0.11.0	Yes
Application	qemu	qemu	0.11.0	Yes
Application	qemu	qemu	0.11.0-rc0	Yes
Application	qemu	qemu	0.11.0-rc1	Yes
Application	qemu	qemu	0.11.0-rc2	Yes
Application	qemu	qemu	0.11.1	Yes
Application	qemu	qemu	0.12.0	Yes
Application	qemu	qemu	0.12.0	Yes
Application	qemu	qemu	0.12.0	Yes
Application	qemu	qemu	0.12.1	Yes
Application	qemu	qemu	0.12.2	Yes
Application	qemu	qemu	0.12.3	Yes
Application	qemu	qemu	0.12.4	Yes
Application	qemu	qemu	0.12.5	Yes
Application	qemu	qemu	0.13.0	Yes
Application	qemu	qemu	0.13.0	Yes
Application	qemu	qemu	0.13.0	Yes
Application	qemu	qemu	0.14.0	Yes
Application	qemu	qemu	0.14.0	Yes
Application	qemu	qemu	0.14.0	Yes
Application	qemu	qemu	0.14.0	Yes
Application	qemu	qemu	0.14.1	Yes
Application	qemu	qemu	0.15.0	Yes
Application	qemu	qemu	0.15.0	Yes
Application	qemu	qemu	1.0	Yes
Application	qemu	qemu	1.0	Yes
Application	qemu	qemu	1.0	Yes
Application	qemu	qemu	1.0	Yes
Application	qemu	qemu	1.0	Yes
Application	qemu	qemu	1.0.1	Yes
Application	qemu	qemu	1.1	Yes
Application	qemu	qemu	1.1	Yes
Application	qemu	qemu	1.1	Yes
Application	qemu	qemu	1.1	Yes
Application	qemu	qemu	1.1	Yes

References

http://blog.nelhage.com/2011/08/breaking-out-of-kvm/ ([email protected])
http://git.kernel.org/?p=virt/kvm/qemu-kvm.git%3Ba=commit%3Bh=505597e4476a6bc219d0ec1362b760d71cb4fdca ([email protected])
http://lists.nongnu.org/archive/html/qemu-devel/2011-05/msg01810.html ([email protected])
http://lists.opensuse.org/opensuse-updates/2011-05/msg00043.html ([email protected])
http://rhn.redhat.com/errata/RHSA-2011-0534.html ([email protected])
http://secunia.com/advisories/44393 Vendor Advisory ([email protected])
http://secunia.com/advisories/44458 Vendor Advisory ([email protected])
http://secunia.com/advisories/44648 Vendor Advisory ([email protected])
http://secunia.com/advisories/44658 Vendor Advisory ([email protected])
http://secunia.com/advisories/44660 Vendor Advisory ([email protected])
http://secunia.com/advisories/44900 Vendor Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2011/05/19/2 ([email protected])
http://www.osvdb.org/73395 ([email protected])
http://www.securityfocus.com/bid/47927 ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=699773 ([email protected])
https://github.com/nelhage/virtunoid ([email protected])
https://hermes.opensuse.org/messages/8572547 ([email protected])
https://www.ubuntu.com/usn/USN-1145-1/ ([email protected])
http://blog.nelhage.com/2011/08/breaking-out-of-kvm/ (af854a3a-2127-422b-91ae-364da2661108)
http://git.kernel.org/?p=virt/kvm/qemu-kvm.git%3Ba=commit%3Bh=505597e4476a6bc219d0ec1362b760d71cb4fdca (af854a3a-2127-422b-91ae-364da2661108)
http://lists.nongnu.org/archive/html/qemu-devel/2011-05/msg01810.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-updates/2011-05/msg00043.html (af854a3a-2127-422b-91ae-364da2661108)
http://rhn.redhat.com/errata/RHSA-2011-0534.html (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/44393 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/44458 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/44648 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/44658 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/44660 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/44900 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2011/05/19/2 (af854a3a-2127-422b-91ae-364da2661108)
http://www.osvdb.org/73395 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/47927 (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=699773 (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/nelhage/virtunoid (af854a3a-2127-422b-91ae-364da2661108)
https://hermes.opensuse.org/messages/8572547 (af854a3a-2127-422b-91ae-364da2661108)
https://www.ubuntu.com/usn/USN-1145-1/ (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For qemu's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.