CVE-2021-28693
5.5
MEDIUM
CVSS 3.1
EPSS 0.06%
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.
How to fix CVE-2021-28693
To remediate CVE-2021-28693, upgrade the affected package to a fixed version below.
- —upgrade to 4.13.3-r1 or later
- —upgrade to 4.14.2+25-gb6a8c4f72d-1 or later
Is CVE-2021-28693 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 4.13.3-r1
- from 0, < 4.14.2+25-gb6a8c4f72d-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |