CVE-2021-26933

MEDIUM Year: 2021
CVSS v3 Score
5.5
Medium
CVSS v2 Score
2.1
Low
Weakness Type
NVD-CWE-Other
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Vulnerability Description

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.

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