CVE-2021-47286 bus: mhi: core: Validate channel ID when processing command completions
A missing validation in the Linux kernel MHI bus driver allows out-of-bounds memory access via crafted device events, potentially leading to code execution or crashes.
- 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-2021-47286?
CVE-2021-47286 is a high-severity memory corruption vulnerability in Linux kernel, published on 21 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
bus: mhi: core: Validate channel ID when processing command completions
MHI reads the channel ID from the event ring element sent by the device which can be any value between 0 and 255. In order to prevent any out of bound accesses, add a check against the maximum number of channels supported by the controller and those channels not configured yet so as to skip processing of that event ring element.
Weakness: CWE-787
Which versions are affected by CVE-2021-47286?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47286?
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-2021-47286 being exploited?
There is no known exploitation of CVE-2021-47286 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47286, GHSA-hw2j-3fc3-hf74, UBUNTU-CVE-2021-47286.