CVE-2021-47306 net: fddi: fix UAF in fza_probe
A use-after-free vulnerability in the Linux kernel's FDDI driver allows attackers to potentially execute code or escalate privileges.
- 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-2021-47306?
CVE-2021-47306 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: fddi: fix UAF in fza_probe
fp is netdev private data and it cannot be used after free_netdev() call. Using fp after free_netdev() can cause UAF bug. Fix it by moving free_netdev() after error message.
TURBOchannel adapter")
Weakness: CWE-416
Which versions are affected by CVE-2021-47306?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47306?
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-2021-47306 being exploited?
There is no known exploitation of CVE-2021-47306 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47306, GHSA-j8g9-5p8g-4f3x, UBUNTU-CVE-2021-47306.