CVE-2020-11743
MEDIUM5.5EPSS 0.09%Published: 4/14/2020Modified: 4/28/2026
Also known as:ALPINE-CVE-2020-11743DEBIAN-CVE-2020-11743
Description
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.
Affected packages (2)
- Alpine/xenfrom 0, < 4.12.2-r1
- Debian/xenfrom 0, < 4.11.4-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |