CVE-2021-47311 net: qcom/emac: fix UAF in emac_remove
A use-after-free vulnerability in the Qualcomm EMAC network driver allows attackers to cause denial of service or execute arbitrary code via improper memory handling.
- 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-2021-47311?
CVE-2021-47311 is a high-severity use after free 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:
net: qcom/emac: fix UAF in emac_remove
adpt is netdev private data and it cannot be used after free_netdev() call. Using adpt after free_netdev() can cause UAF bug. Fix it by moving free_netdev() at the end of the function.
Weakness: CWE-416
Which versions are affected by CVE-2021-47311?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47311?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2021-47311 being exploited?
There is no known exploitation of CVE-2021-47311 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47311, GHSA-2hq2-46wf-3mhv, UBUNTU-CVE-2021-47311.