What’s Vulnerable › Vulnerabilities

CVE-2021-28693

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-30 · updated 2026-06-17

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.

Affected products

• xen: from 4.12.0 through 4.15.0; 4.15.0-rc1

References

• https://security.gentoo.org/glsa/202107-30
• https://xenbits.xenproject.org/xsa/advisory-372.txt
• https://security.gentoo.org/glsa/202107-30
• https://xenbits.xenproject.org/xsa/advisory-372.txt

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