CVE-2020-36387 Use after free in n/a
A use-after-free vulnerability in the Linux kernel's io_uring subsystem allows attackers to execute arbitrary 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-2020-36387?
CVE-2020-36387 is a high-severity use after free vulnerability in Linux kernel, published on 7 Jun 2021. 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 the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.
Weakness: CWE-416
Which versions are affected by CVE-2020-36387?
It affects 9 products.
Products include Linux kernel, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware, Netapp H500e Firmware and 3 more.
How do I fix CVE-2020-36387?
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-2020-36387 being exploited?
There is no known exploitation of CVE-2020-36387 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2020-36387, GHSA-h865-4c46-jfqg, UBUNTU-CVE-2020-36387.