UpHeron
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Servers and applications

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.

Severity
Medium 4.9
Published
1 Apr 2015
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
0.4% in the next 30 daysHigher than 39% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
CWE-264
Attack
Needs local access · No login needed
Attacker can
Take it down
CVSS vector
AV:L/AC:L/Au:N/C:N/I:N/A:C
Sources
NVD

Affected software

SoftwareAffected versions
XenServers and applications · cpe:o:xen:xen
  • Version 4.3.0
  • Version 4.3.1
  • Version 4.3.2
  • Version 4.4.0
  • Version 4.4.1
  • Version 4.5.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2015-2756
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2015-2756