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Medium severity5.5NVD Advisory· Published Feb 17, 2021· Updated Jun 17, 2026

CVE-2021-26933

CVE-2021-26933

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

7
  • Debian/linux
    cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • Fedoraproject/Fedora2 versions
    cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
    • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
  • Xen/Xen2 versions
    cpe:2.3:o:xen:xen:*:*:*:*:*:*:arm:*+ 1 more
    • cpe:2.3:o:xen:xen:*:*:*:*:*:*:arm:*range: >=4.9.0,<=4.14.1
    • (no CPE)range: 4.9 - 4.14.x
  • Xen/Xendescription
  • Xen Project/Xenllm-fuzzy
    Range: 4.9 - 4.14.x

Patches

Vulnerability mechanics

References

4

News mentions

0

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