CVE & CISA-KEV Catalog

CVE-2015-2756

MEDIUM
4.9
CVSS v2
NVD

Description

QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.

CWE-264Permissions, Privileges, and Access Controls

How to fix

Remediation Available
qemuDebian
Fixed in:1:2.3+dfsg-3CVE-2015-2756
Fixed in:1:2.3+dfsg-3CVE-2015-2756
Fixed in:1:2.3+dfsg-3CVE-2015-2756
Fixed in:1:2.3+dfsg-3CVE-2015-2756
qemuUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.11USN-2608-1
qemu-systemUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.11USN-2608-1
qemu-system-aarch64Ubuntu
Fixed in:2.0.0+dfsg-2ubuntu1.11USN-2608-1
qemu-system-armUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.11USN-2608-1
qemu-system-mipsUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.11USN-2608-1
qemu-system-miscUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.11USN-2608-1
qemu-system-ppcUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.11USN-2608-1
qemu-system-sparcUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.11USN-2608-1
qemu-system-x86Ubuntu
Fixed in:2.0.0+dfsg-2ubuntu1.11USN-2608-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

0.45%probability of exploitation in 30 days
36thpercentile

Low risk: more likely to be exploited than 36% of all known CVEs.

References

Vendor Advisory1

Related Vulnerabilities

Other CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2012-1456Medium4.3100%--
CVE-2012-1459Medium4.3100%-Fix
CVE-2012-1446Medium4.3100%--
CVE-2012-1443Medium4.3100%--
CVE-2012-1442Medium4.399%--
CVE-2012-1457Medium4.398%-Fix
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.