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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Remediation
No vendor fix or workaround currently provided.
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Tracking
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Advisories
| Source | ID | Title |
|---|---|---|
Debian DSA |
DSA-4888-1 | xen security update |
EUVD |
EUVD-2021-13715 | 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. |
References
History
No history.
Status: PUBLISHED
Assigner: mitre
Published:
Updated: 2024-08-03T20:33:41.404Z
Reserved: 2021-02-09T00:00:00.000Z
Link: CVE-2021-26933
No data.
Status : Modified
Published: 2021-02-17T02:15:13.097
Modified: 2024-11-21T05:57:04.653
Link: CVE-2021-26933
No data.
OpenCVE Enrichment
No data.
Weaknesses
Debian DSA
EUVD