How severe is CVE-2015-2756?

CVE-2015-2756 has a CVSS 2.0 base score of 4.9, rated medium severity.

Is CVE-2015-2756 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-2756?

CVE-2015-2756 primarily affects Debian Debian Linux. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-2756?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-2756 published?

CVE-2015-2756 was published on 2015-04-01 and last updated on 2026-06-17.

CVE-2015-2756

CVE-2015-2756 is a medium-severity vulnerability in Debian Debian Linux with a CVSS 2.0 base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-264.

Key facts

Severity: Medium (CVSS 2.0 base score 4.9)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Debian Debian Linux
Published: 2015-04-01
Last modified: 2026-06-17

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.

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?: CVE-2015-2756 has a CVSS 2.0 base score of 4.9, rated medium severity.
Is CVE-2015-2756 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-2756?: CVE-2015-2756 primarily affects Debian Debian Linux. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-2756?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-2756 published?: CVE-2015-2756 was published on 2015-04-01 and last updated on 2026-06-17.

References

Affected products (14)

cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.3.0:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.3.1:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.3.2:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.4.0:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.4.1:-:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.5.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*

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