CVE-2012-3495

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.

Published: 2012-11-23 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-3495 is rated Low Risk (32.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.06%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2012-3495

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2023-03-07 1.55% 0.06% -1.48%
2 2022-02-04 — 1.55% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-3495

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 2.0 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:C Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:C)
Complete availability impact.
 3.9 8.5 [email protected]

Weakness enumeration for CVE-2012-3495

OS Trackers for CVE-2012-3495

vendor priority summary link
debian not yet assigned CVE-2012-3495 not yet assigned priority: Debian including 1 source packages (xen), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2012-3495
gentoo normal CVE-2012-3495: 2 GLSA(s) (201309-24, 201604-03), 4 atom(s) (app-emulation/pvgrub, app-emulation/xen, app-emulation/xen-pvgrub, app-emulation/xen-tools); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2012-3495
redhat medium — https://access.redhat.com/security/cve/CVE-2012-3495
ubuntu medium CVE-2012-3495 medium priority: Ubuntu including 4 source packages (xen, xen-3.1, xen-3.2, xen-3.3), 28 status rows across 7 suites (hardy, lucid, natty, oneiric, precise, quantal, upstream): DNE 17, not-affected 5, needs-triage 3, released 3. https://ubuntu.com/security/CVE-2012-3495

Affected software / configurations for CVE-2012-3495

Vendor Product Version Raw CPE
citrix xenserver <= 6.0.2 cpe:2.3:a:citrix:xenserver:*:*:*:*:*:*:*:*
citrix xenserver 5.0 cpe:2.3:a:citrix:xenserver:5.0:*:*:*:*:*:*:*
citrix xenserver 5.5 cpe:2.3:a:citrix:xenserver:5.5:*:*:*:*:*:*:*
citrix xenserver 5.6 cpe:2.3:a:citrix:xenserver:5.6:*:*:*:*:*:*:*
citrix xenserver 5.6 cpe:2.3:a:citrix:xenserver:5.6:fp1:*:*:*:*:*:*
citrix xenserver 5.6 cpe:2.3:a:citrix:xenserver:5.6:sp2:*:*:*:*:*:*
citrix xenserver 6.0 cpe:2.3:a:citrix:xenserver:6.0:*:*:*:*:*:*:*
xen xen 4.1.0 cpe:2.3:o:xen:xen:4.1.0:*:*:*:*:*:*:*
xen xen 4.1.1 cpe:2.3:o:xen:xen:4.1.1:*:*:*:*:*:*:*
xen xen 4.1.2 cpe:2.3:o:xen:xen:4.1.2:*:*:*:*:*:*:*
xen xen 4.1.3 cpe:2.3:o:xen:xen:4.1.3:*:*:*:*:*:*:*

References for CVE-2012-3495

URL Tags
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
http://www.securityfocus.com/bid/55406
http://www.securitytracker.com/id?1027480
http://xenbits.xen.org/hg/xen-4.1-testing.hg/rev/6779ddca8593
https://security.gentoo.org/glsa/201604-03
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