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7.1

Xen hypervisor can be locked by partially controlled guest

CVE-2015-2751 · published 11 years ago
Summary

Xen versions 4.3 through 4.5 allow a virtual machine that has limited management rights to send special control commands that can freeze the entire host server. This can cause business downtime because the physical machine stops responding. Update Xen to the latest patched release or disable toolstack disaggregation to prevent the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
xen xen 4.3.0
4.3.1
4.3.2
4.4.0
4.4.1
4.5.0
cpe:2.3:o:xen:xen:4.3.0:*:*:*:*:*:*:*
fedoraproject fedora 20
21
cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:*
Original advisory text
Xen 4.3.x, 4.4.x, and 4.5.x, when using toolstack disaggregation, allows remote domains with partial management control to cause a denial of service (host lock) via unspecified domctl operations.
Xen 4.3.x, 4.4.x, and 4.5.x, when using toolstack disaggregation, allows remote domains with partial management control to cause a denial of service (host lock) via unspecified domctl operations.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
7.1 High
Exploitation
2% chance of attack within 30 days
Type
CWE-17DEPRECATED: Code
Timeline
Published1 Apr 2015
Updated29 Oct 2026
First seen29 Sep 2026
Sources
CVE-2015-2751 · NVD
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