CVE-2021-28693 Information disclosure in xen
Xen hypervisor on Arm fails to scrub boot modules, potentially leaking sensitive data from kernel or initramfs to guest domains.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-28693?
CVE-2021-28693 is a medium-severity vulnerability in Xen Xen, published on 30 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2021-28693?
It affects 1 product.
Products include Xen Xen.
How do I fix CVE-2021-28693?
Apply the vendor's patch.
Is CVE-2021-28693 being exploited?
There is no known exploitation of CVE-2021-28693 in the wild and no public exploit code.
Other vulnerabilities in Xen Xen
Sources
Also known as ALPINE-CVE-2021-28693, DEBIAN-CVE-2021-28693, GHSA-jpfw-vm34-2p3p, UBUNTU-CVE-2021-28693.