CVE-2021-26933

First published: Wed Feb 17 2021(Updated: )

An issue was discovered in Xen 4.9 through 4.14.x. On Arm, a guest is allowed to control whether memory accesses are bypassing the cache. This means that Xen needs to ensure that all writes (such as the ones during scrubbing) have reached the memory before handing over the page to a guest. Unfortunately, the operation to clean the cache is happening before checking if the page was scrubbed. Therefore there is no guarantee when all the writes will reach the memory.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
debian/xen		4.11.4+107-gef32c7afa2-1 4.14.6-1 4.14.5+94-ge49571868d-1 4.17.1+2-gb773c48e36-1 4.17.2+55-g0b56bed864-1
Xen Xen	>=4.9.0<=4.14.1
Fedoraproject Fedora	=32
Fedoraproject Fedora	=33
Debian Debian Linux	=10.0

Remedy

http://xenbits.xen.org/xsa/advisory-364.html

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