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CVE-2021-26933

Status Candidate

Overview

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.

Related Files

Debian Security Advisory 4888-1
Posted Apr 28, 2021
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4888-1 - Multiple vulnerabilities have been discovered in the Xen hypervisor, which could result in denial of service, privilege escalation or memory disclosure.

tags | advisory, denial of service, vulnerability
systems | linux, debian
advisories | CVE-2021-26933, CVE-2021-27379
SHA-256 | 59e07669cdeed8f06fc9b1e8019517c110224b603dd928949ce5f0729cdf99b0
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