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CVE-2021-28693

xen/arm: Boot modules are not scrubbed The bootloader will load boot modules (e.g. kernel, initramfs...) in a temporary area before they…

Medium5.5EPSS 0.32%
Published
Updated
Reserved
Assigned by
XEN

Description

xen/arm: Boot modules are not scrubbed The bootloader will load boot modules (e.g. kernel, initramfs...) in a temporary area before they are copied by Xen to each domain memory. To ensure sensitive data is not leaked from the modules, Xen must "scrub" them before handing the page over to the allocator. Unfortunately, it was discovered that modules will not be scrubbed on Arm.

Scores

CVSS scores of CVE-2021-28693, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS (exploitation in 30 days)
0.32% · top 75% of all CVEs (6 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

  • unknown

Affected products

  • Xen · xen

    • affected 4.15.x

  • Xen · xen

    • unknown unspecified – < 4.12
    • affected 4.13.x – < unspecified
    • unaffected next of 4.14.x – < unspecified

  • Xen · xen

    • affected xen-unstable

  • Xen · xen

    • affected 4.12.x

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .