The set_debugreg hypercall in include/asm-x86/debugreg.h in Xen 4.0, 4.1, and 4.2, and…
Priority LOW 12CWE-264Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-264.
Summary
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.
Why it matters now
EPSS 0.00437 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 · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:citrix:xenserver:*:-:*:*:*:*:x64:* | up to 6.0.2 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xenserver:*:-:*:*:*:*:x86:* | up to 6.0.2 | Vulnerable | Citrix |
| cpe:2.3:o:xen:xen:4.0.0:-:*:*:*:*:x64:* | 4.0.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.0.0:-:*:*:*:*:x86:* | 4.0.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.1.0:-:*:*:*:*:x64:* | 4.1.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.1.0:-:*:*:*:*:x86:* | 4.1.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.2.0:-:*:*:*:*:x64:* | 4.2.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.2.0:-:*:*:*:*:x86:* | 4.2.0 | Vulnerable | Xen |
- cpe:2.3:a:citrix:xenserver:*:-:*:*:*:*:x64:* Versions up to 6.0.2 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xenserver:*:-:*:*:*:*:x86:* Versions up to 6.0.2 Vulnerable ·Citrix
- cpe:2.3:o:xen:xen:4.0.0:-:*:*:*:*:x64:* Versions 4.0.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.0.0:-:*:*:*:*:x86:* Versions 4.0.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.1.0:-:*:*:*:*:x64:* Versions 4.1.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.1.0:-:*:*:*:*:x86:* Versions 4.1.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.2.0:-:*:*:*:*:x64:* Versions 4.2.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.2.0:-:*:*:*:*:x86:* Versions 4.2.0 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-2012-3494
- 2026-10-03 Alias added: GHSA-6p48-jg39-2mq7
References
Advisory 12
Other 5
- http://wiki.xen.org/wiki/Security_Announcements#XSA-12_hypercall_set_debugreg_vulnerability
- https://bugzilla.redhat.com/show_bug.cgi?id=851139
- [oss-security] 20120905 Xen Security Advisory 12 (CVE-2012-3494) - hypercall set_debugreg vulnerability
- [Xen-announce] 20120905 Xen Security Advisory 12 (CVE-2012-3494) - hypercall set_debugreg vulnerability
- 85197
Sources
- CVE-2012-3494 · CVE Program
- CVE-2012-3494 · NVD
- FIRST EPSS
- GHSA-6p48-jg39-2mq7 · GitHub Advisory Database · CC BY 4.0
- CVE-2012-3494 · 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