Homepage
About Snyk

CVE-2021-26933 Affecting xen package, versions <4.14.1-r3

0.0
medium

Snyk CVSS

    Attack Complexity Low
    Confidentiality High

    Threat Intelligence

    EPSS 0.05% (15th percentile)
Expand this section
NVD
5.5 medium

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk ID SNYK-ALPINE314-XEN-1308560
  • published 28 Feb 2021
  • disclosed 17 Feb 2021
Report a new vulnerability Found a mistake?

Introduced: 17 Feb 2021

CVE-2021-26933 Open this link in a new tab

How to fix?

Upgrade Alpine:3.14 xen to version 4.14.1-r3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Alpine. See How to fix? for Alpine:3.14 relevant fixed versions and status.

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.