CVE ID:	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.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2020-11743 Debian Security Information: DSA-4723 (Google Search) https://www.debian.org/security/2020/dsa-4723 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5M2XRNCHOGGTJQBZQJ7DCV6ZNAKN3LE2/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YMAW7D2MP6RE4BFI5BZWOBBWGY3VSOFN/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NVTP4OYHCTRU3ONFJOFJQVNDFB25KLLG/ https://security.gentoo.org/glsa/202005-08 https://xenbits.xen.org/xsa/advisory-316.html http://www.openwall.com/lists/oss-security/2020/04/14/3 SuSE Security Announcement: openSUSE-SU-2020:0599 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00006.html