Xen maintains the _GTF_{read,writ}ing bits as appropriate, to inform the guest that a…
Priority LOW 29CWE-200Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- 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-200.
Summary
Xen maintains the _GTF_{read,writ}ing bits as appropriate, to inform the guest that a grant is in use. A guest is expected not to modify the grant details while it is in use, whereas the guest is free to modify/reuse the grant entry when it is not in use. Under some circumstances, Xen will clear the status bits too early, incorrectly informing the guest that the grant is no longer in use. A guest may prematurely believe that a granted frame is safely private again, and reuse it in a way which contains sensitive information, while the domain on the far end of the grant is still using the grant. Xen 4.9, 4.8, 4.7, 4.6, and 4.5 are affected.
Why it matters now
EPSS 0.00398 34th 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 · 18
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:xen:xen:4.5.0:*:*:*:*:*:*:* | 4.5.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.5.1:*:*:*:*:*:*:* | 4.5.1 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.5.2:*:*:*:*:*:*:* | 4.5.2 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.5.3:*:*:*:*:*:*:* | 4.5.3 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.5.5:*:*:*:*:*:*:* | 4.5.5 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.6.0:*:*:*:*:*:*:* | 4.6.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.6.1:*:*:*:*:*:*:* | 4.6.1 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.6.3:*:*:*:*:*:*:* | 4.6.3 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.6.4:*:*:*:*:*:*:* | 4.6.4 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.6.5:*:*:*:*:*:*:* | 4.6.5 | Vulnerable | Xen |
- cpe:2.3:o:xen:xen:4.5.0:*:*:*:*:*:*:* Versions 4.5.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.5.1:*:*:*:*:*:*:* Versions 4.5.1 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.5.2:*:*:*:*:*:*:* Versions 4.5.2 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.5.3:*:*:*:*:*:*:* Versions 4.5.3 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.5.5:*:*:*:*:*:*:* Versions 4.5.5 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.6.0:*:*:*:*:*:*:* Versions 4.6.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.6.1:*:*:*:*:*:*:* Versions 4.6.1 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.6.3:*:*:*:*:*:*:* Versions 4.6.3 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.6.4:*:*:*:*:*:*:* Versions 4.6.4 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.6.5:*:*:*:*:*:*:* Versions 4.6.5 Vulnerable ·Xen
Show 8 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:xen:xen:4.6.6:*:*:*:*:*:*:* | 4.6.6 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.7.0:*:*:*:*:*:*:* | 4.7.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.7.1:*:*:*:*:*:*:* | 4.7.1 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.7.2:*:*:*:*:*:*:* | 4.7.2 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.7.3:*:*:*:*:*:*:* | 4.7.3 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.8.0:*:*:*:*:*:*:* | 4.8.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.8.1:*:*:*:*:*:*:* | 4.8.1 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.9.0:*:*:*:*:*:*:* | 4.9.0 | Vulnerable | Xen |
- cpe:2.3:o:xen:xen:4.6.6:*:*:*:*:*:*:* Versions 4.6.6 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.7.0:*:*:*:*:*:*:* Versions 4.7.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.7.1:*:*:*:*:*:*:* Versions 4.7.1 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.7.2:*:*:*:*:*:*:* Versions 4.7.2 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.7.3:*:*:*:*:*:*:* Versions 4.7.3 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.8.0:*:*:*:*:*:*:* Versions 4.8.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.8.1:*:*:*:*:*:*:* Versions 4.8.1 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.9.0:*:*:*:*:*:*:* Versions 4.9.0 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 →
| 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-2017-12855
- 2026-10-03 Alias added: GHSA-c6pm-8crm-3rr8
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-2017-12855 · CVE Program
- CVE-2017-12855 · NVD
- FIRST EPSS
- GHSA-c6pm-8crm-3rr8 · GitHub Advisory Database · CC BY 4.0
- CVE-2017-12855 · 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