Access Restriction Bypass Affecting xen package, versions <4.1.2-2ubuntu2.4


Severity

Recommended
0.0
medium
0
10

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.06% (31st percentile)

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  • Snyk IDSNYK-UBUNTU1204-XEN-366135
  • published23 Nov 2012
  • disclosed23 Nov 2012

Introduced: 23 Nov 2012

CVE-2012-3494  (opens in a new tab)
CWE-264  (opens in a new tab)

How to fix?

Upgrade Ubuntu:12.04 xen to version 4.1.2-2ubuntu2.4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Ubuntu. See How to fix? for Ubuntu:12.04 relevant fixed versions and status.

The set_debugreg hypercall in include/asm-x86/debugreg.h in Xen 4.0, 4.1, and 4.2, and Citrix XenServer 6.0.2 and earlier, when running on x86-64 systems, allows local OS guest users to cause a denial of service (host crash) by writing to the reserved bits of the DR7 debug control register.

References

CVSS Scores

version 3.1