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Servers and applications

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.

Severity
Medium 6.1
Published
23 Nov 2012
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
0.4% in the next 30 daysHigher than 38% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Needs local access · No login needed
Attacker can
Read some data · Change some data · Take it down
CVSS vector
AV:L/AC:L/Au:N/C:P/I:P/A:C
Sources
NVD

Affected software

SoftwareAffected versions
XenServers and applications · cpe:o:xen:xen
  • Version 4.1.0
  • Version 4.1.1
  • Version 4.1.2
  • Version 4.1.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2012-3495
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2012-3495