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CVE-2020-11743

Status Candidate

Overview

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.

Related Files

Gentoo Linux Security Advisory 202005-08
Posted May 15, 2020
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202005-8 - Multiple vulnerabilities have been found in Xen, the worst of which could allow privilege escalation. Versions less than 4.12.2-r2 are affected.

tags | advisory, vulnerability
systems | linux, gentoo
advisories | CVE-2020-11739, CVE-2020-11740, CVE-2020-11741, CVE-2020-11742, CVE-2020-11743
MD5 | 36de94d2514b90dc4856d667f55f8f6d
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