The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix…
Priority LOW 28CWE-20Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Partial · Partial · Complete
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.00439 38th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 11
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:citrix:xenserver:*:*:*:*:*:*:*:* | up to 6.0.2 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xenserver:5.0:*:*:*:*:*:*:* | 5.0 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xenserver:5.5:*:*:*:*:*:*:* | 5.5 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xenserver:5.6:*:*:*:*:*:*:* | 5.6 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xenserver:5.6:fp1:*:*:*:*:*:* | 5.6 fp1 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xenserver:5.6:sp2:*:*:*:*:*:* | 5.6 sp2 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xenserver:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Citrix |
| cpe:2.3:o:xen:xen:4.1.0:*:*:*:*:*:*:* | 4.1.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.1.1:*:*:*:*:*:*:* | 4.1.1 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.1.2:*:*:*:*:*:*:* | 4.1.2 | Vulnerable | Xen |
- cpe:2.3:a:citrix:xenserver:*:*:*:*:*:*:*:* Versions up to 6.0.2 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xenserver:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xenserver:5.5:*:*:*:*:*:*:* Versions 5.5 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xenserver:5.6:*:*:*:*:*:*:* Versions 5.6 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xenserver:5.6:fp1:*:*:*:*:*:* Versions 5.6 fp1 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xenserver:5.6:sp2:*:*:*:*:*:* Versions 5.6 sp2 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xenserver:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Citrix
- cpe:2.3:o:xen:xen:4.1.0:*:*:*:*:*:*:* Versions 4.1.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.1.1:*:*:*:*:*:*:* Versions 4.1.1 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.1.2:*:*:*:*:*:*:* Versions 4.1.2 Vulnerable ·Xen
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 1 product
- Red Hat Enterprise Linux 5
Timeline
- 2026-10-02 Threatist record created from CVE-2012-3495
- 2026-10-03 Alias added: GHSA-w2q9-w27j-m384
References
Advisory 7
Other 5
- http://xenbits.xen.org/hg/xen-4.1-testing.hg/rev/6779ddca8593
- [Xen-announce] 20120905 Xen Security Advisory 13 (CVE-2012-3495) - hypercall physdev_get_free_pirq vulnerability
- http://wiki.xen.org/wiki/Security_Announcements#XSA-13_hypercall_physdev_get_free_pirq_vulnerability
- http://support.citrix.com/article/CTX134708
- [oss-security] 20120905 Xen Security Advisory 13 (CVE-2012-3495) - hypercall physdev_get_free_pirq vulnerability
Sources
- CVE-2012-3495 · CVE Program
- CVE-2012-3495 · NVD
- FIRST EPSS
- GHSA-w2q9-w27j-m384 · GitHub Advisory Database · CC BY 4.0
- CVE-2012-3495 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences