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.
Metrics
Affected Vendors & Products
References
History
No history.
MITRE
Status: PUBLISHED
Assigner: mitre
Published: 2021-02-17T01:05:46
Updated: 2024-08-03T20:33:41.404Z
Reserved: 2021-02-09T00:00:00
Link: CVE-2021-26933
Vulnrichment
No data.
NVD
Status : Modified
Published: 2021-02-17T02:15:13.097
Modified: 2024-11-21T05:57:04.653
Link: CVE-2021-26933
Redhat
No data.