CVE-2021-26933
Medium
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.
SeverityMedium
CVSS5.5
Exploit probability—
Product
Xen
PublishedFeb 17, 2021
First seenFeb 17, 2021
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| xen xen | 4.9.0 ≤ v ≤ 4.14.1 | — |
| fedoraproject fedora | 32, 33 | — |
| debian debian_linux | 10.0 | — |
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