CVE-2012-3495

Severity: medium (CVSS 6.1 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-20

Description

The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.

Affected products

Citrix XenServer: through 6.0.2; 5.0, 5.5, 5.6, 5.6-fp1, 5.6-sp2, 6.0
xen: 4.1.0, 4.1.1, 4.1.2, 4.1.3

References

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/msg00017.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/msg00001.html
http://secunia.com/advisories/51413
http://secunia.com/advisories/55082
http://security.gentoo.org/glsa/glsa-201309-24.xml
http://support.citrix.com/article/CTX134708
http://wiki.xen.org/wiki/Security_Announcements#XSA-13_hypercall_physdev_get_free_pirq_vulnerability
http://www.openwall.com/lists/oss-security/2012/09/05/6

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