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Vulnerability Details : CVE-2020-11743

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.
Publish Date : 2020-04-14 Last Update Date : 2020-07-13
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID 755

- Products Affected By CVE-2020-11743

# Product Type Vendor Product Version Update Edition Language
1 OS Fedoraproject Fedora 32 * * * Version Details Vulnerabilities
2 OS XEN XEN * * * * Version Details Vulnerabilities
3 OS XEN XEN 4.13.0 RC1 * * Version Details Vulnerabilities
4 OS XEN XEN 4.13.0 RC2 * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Fedoraproject Fedora 1

- References For CVE-2020-11743 CONFIRM
MLIST [oss-security] 20200414 Xen Security Advisory 316 v3 (CVE-2020-11743) - Bad error path in GNTTABOP_map_grant[email protected]/message/YMAW7D2MP6RE4BFI5BZWOBBWGY3VSOFN/
FEDORA FEDORA-2020-440457afe4[email protected]/message/5M2XRNCHOGGTJQBZQJ7DCV6ZNAKN3LE2/
FEDORA FEDORA-2020-295ed0b1e0
SUSE openSUSE-SU-2020:0599[email protected]/message/NVTP4OYHCTRU3ONFJOFJQVNDFB25KLLG/
FEDORA FEDORA-2020-cbc3149753
GENTOO GLSA-202005-08

- Metasploit Modules Related To CVE-2020-11743

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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