CVE-2021-47138 cxgb4: avoid accessing registers when clearing filters
A flaw in the cxgb4 driver allows out-of-bound memory access when clearing filters during hardware errors, potentially causing a system crash.
- 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-2021-47138?
CVE-2021-47138 is a high-severity memory corruption vulnerability in Linux kernel, published on 25 Mar 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:
cxgb4: avoid accessing registers when clearing filters
Hardware register having the server TID base can contain invalid values when adapter is in bad state (for example, due to AER fatal error). Reading these invalid values in the register can lead to out-of-bound memory access. So, fix by using the saved server TID base when clearing filters.
Weakness: CWE-787
Which versions are affected by CVE-2021-47138?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47138?
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-2021-47138 being exploited?
There is no known exploitation of CVE-2021-47138 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47138, GHSA-qjmm-w6cw-3hf3, UBUNTU-CVE-2021-47138.