CVE-2020-29040 Memory corruption in n/a
An off-by-one error in Xen allows guest OS users to cause stack corruption, leading to denial of service, data leaks, or privilege escalation.
- 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-2020-29040?
CVE-2020-29040 is a high-severity memory corruption vulnerability in Xen Xen, published on 24 Nov 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in Xen through 4.14.x allowing x86 HVM guest OS users to cause a denial of service (stack corruption), cause a data leak, or possibly gain privileges because of an off-by-one error. NOTE: this issue is caused by an incorrect fix for CVE-2020-27671.
Which versions are affected by CVE-2020-29040?
It affects 1 product.
Products include Xen Xen.
How do I fix CVE-2020-29040?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-29040 being exploited?
There is no known exploitation of CVE-2020-29040 in the wild and no public exploit code.
Other vulnerabilities in Xen Xen
Sources
Also known as ALPINE-CVE-2020-29040, DEBIAN-CVE-2020-29040, GHSA-w3xr-26m4-xc8m, UBUNTU-CVE-2020-29040.