CVE-2012-3494

Severity: low (CVSS 2.1 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2012-11-23 · updated 2026-06-16
Weakness: CWE-264

Description

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.

Affected products

Citrix XenServer: through 6.0.2
xen: 4.0.0, 4.1.0, 4.2.0

References

http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00003.html
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00012.html
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00018.html
http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00018.html
http://lists.xen.org/archives/html/xen-announce/2012-09/msg00000.html
http://osvdb.org/85197
http://secunia.com/advisories/50472

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