The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when…
Priority LOW 34CWE-264Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-264.
Summary
The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when accessing memory, which might allow local HVM guest users to gain privileges via vectors involving "unexpected" base/limit values.
Why it matters now
EPSS 0.00446 39th percentileScored 2026-11-07
Fix Will not fix Red Hat: no fix planned
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 · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:citrix:xenserver:6.0.2:*:*:*:*:*:*:* | 6.0.2 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xenserver:6.2.0:*:*:*:*:*:*:* | 6.2.0 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xenserver:6.5:*:*:*:*:*:*:* | 6.5 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xenserver:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Citrix |
| cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* | all versions | Vulnerable | Xen |
- cpe:2.3:a:citrix:xenserver:6.0.2:*:*:*:*:*:*:* Versions 6.0.2 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xenserver:6.2.0:*:*:*:*:*:*:* Versions 6.2.0 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xenserver:6.5:*:*:*:*:*:*:* Versions 6.5 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xenserver:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Citrix
- cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* Versions all versions 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 →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2016-9386
- 2026-10-03 Alias added: GHSA-5mmc-9chw-pm3p
References
Sources
- CVE-2016-9386 · CVE Program
- CVE-2016-9386 · NVD
- FIRST EPSS
- GHSA-5mmc-9chw-pm3p · GitHub Advisory Database · CC BY 4.0
- CVE-2016-9386 · 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