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CVE-2015-2756

UnknownEPSS 0.45%

Last modified

CVE-2015-2756 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.45%

36.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
DebianDebian Linux7.0
DebianDebian Linux8.0
XenXen4.3.0
XenXen4.3.1
XenXen4.3.2
XenXen4.4.0
XenXen4.4.1
XenXen4.5.0
FedoraprojectFedora20
FedoraprojectFedora21
CanonicalUbuntu Linux12.04
CanonicalUbuntu Linux14.04
CanonicalUbuntu Linux14.10
CanonicalUbuntu Linux15.04

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2015-2756?
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.
How severe is CVE-2015-2756?
Severity scoring for CVE-2015-2756 is pending analysis. The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.
How do I fix CVE-2015-2756?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST