The x86_emulate function in arch/x86/x86_emulate/x86_emulate.c in Xen 3.3.x through 4.4.x…
Priority LOW 18CWE-264Published · Updated
Key facts
- Attack vector
- Adjacent network
- 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 x86_emulate function in arch/x86/x86_emulate/x86_emulate.c in Xen 3.3.x through 4.4.x does not check the supervisor mode permissions for instructions that generate software interrupts, which allows local HVM guest users to cause a denial of service (guest crash) via unspecified vectors.
Why it matters now
EPSS 0.00849 58th 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 · 19
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:xen:xen:3.3.0:*:*:*:*:*:*:* | 3.3.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:3.3.1:*:*:*:*:*:*:* | 3.3.1 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:3.3.2:*:*:*:*:*:*:* | 3.3.2 | Vulnerable | Xen |
| 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:o:xen:xen:4.1.3:*:*:*:*:*:*:* | 4.1.3 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.1.4:*:*:*:*:*:*:* | 4.1.4 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.1.5:*:*:*:*:*:*:* | 4.1.5 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.1.6.1:*:*:*:*:*:*:* | 4.1.6.1 | Vulnerable | Xen |
- cpe:2.3:o:xen:xen:3.3.0:*:*:*:*:*:*:* Versions 3.3.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:3.3.1:*:*:*:*:*:*:* Versions 3.3.1 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:3.3.2:*:*:*:*:*:*:* Versions 3.3.2 Vulnerable ·Xen
- 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
- cpe:2.3:o:xen:xen:4.1.3:*:*:*:*:*:*:* Versions 4.1.3 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.1.4:*:*:*:*:*:*:* Versions 4.1.4 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.1.5:*:*:*:*:*:*:* Versions 4.1.5 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.1.6.1:*:*:*:*:*:*:* Versions 4.1.6.1 Vulnerable ·Xen
Show 9 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:xen:xen:4.2.0:*:*:*:*:*:*:* | 4.2.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.2.1:*:*:*:*:*:*:* | 4.2.1 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.2.2:*:*:*:*:*:*:* | 4.2.2 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.2.3:*:*:*:*:*:*:* | 4.2.3 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.3.0:*:*:*:*:*:*:* | 4.3.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.3.1:*:*:*:*:*:*:* | 4.3.1 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.4.0:*:*:*:*:*:*:* | 4.4.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.4.0:rc1:*:*:*:*:*:* | 4.4.0 rc1 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.4.1:-:*:*:*:*:*:* | 4.4.1 | Vulnerable | Xen |
- cpe:2.3:o:xen:xen:4.2.0:*:*:*:*:*:*:* Versions 4.2.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.2.1:*:*:*:*:*:*:* Versions 4.2.1 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.2.2:*:*:*:*:*:*:* Versions 4.2.2 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.2.3:*:*:*:*:*:*:* Versions 4.2.3 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.3.0:*:*:*:*:*:*:* Versions 4.3.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.3.1:*:*:*:*:*:*:* Versions 4.3.1 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.4.0:*:*:*:*:*:*:* Versions 4.4.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.4.0:rc1:*:*:*:*:*:* Versions 4.4.0 rc1 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.4.1:-:*:*:*:*:*:* Versions 4.4.1 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-2014-7156
- 2026-10-03 Alias added: GHSA-fwm9-x5p7-wwvw
References
More Xen vulnerabilities
- TI-2012-00210 The x86-64 kernel system-call functionality in Xen 4.1.2 and earlier, as used in Citrix… CVSS 2.0HIGH 7.2
- TI-2023-07042 Information disclosure through error messages in AMD Ryzen™ 3000 Series Desktop… CVSS 3.1MEDIUM 5.5
- TI-2015-04333 The C+ mode offload emulation in the RTL8139 network card device model in QEMU, as used… CVSS 2.0HIGH 9.3
- TI-2015-06741 The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows… CVSS 3.1CRITICAL 10.0
- TI-2018-06436 A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures… CVSS 3.0HIGH 7.8
- TI-2024-20522 x86: Incorrect logic for BTC/SRSO mitigations CVSS 3.1HIGH 7.5
Sources
- CVE-2014-7156 · CVE Program
- CVE-2014-7156 · NVD
- FIRST EPSS
- GHSA-fwm9-x5p7-wwvw · GitHub Advisory Database · CC BY 4.0
- CVE-2014-7156 · 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