An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial…
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.
Why it matters now
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 · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* | up to 4.13.0 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.13.0:rc1:*:*:*:*:*:* | 4.13.0 rc1 | Vulnerable | Xen |
| cpe:2.3:o:xen:xen:4.13.0:rc2:*:*:*:*:*:* | 4.13.0 rc2 | Vulnerable | Xen |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
- cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* Versions up to 4.13.0 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.13.0:rc1:*:*:*:*:*:* Versions 4.13.0 rc1 Vulnerable ·Xen
- cpe:2.3:o:xen:xen:4.13.0:rc2:*:*:*:*:*:* Versions 4.13.0 rc2 Vulnerable ·Xen
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
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-2020-11743
- 2026-10-03 Alias added: GHSA-ff8p-26v5-2cw5
References
Sources
- CVE-2020-11743 · CVE Program
- CVE-2020-11743 · NVD
- FIRST EPSS
- GHSA-ff8p-26v5-2cw5 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-11743 · Red Hat security data · CC BY 4.0
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