CVE-2020-27835 Use after free in kernel
A local attacker can crash the system via a use-after-free flaw in the Linux kernel infiniband hfi1 driver.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-27835?
CVE-2020-27835 is a medium-severity use after free vulnerability in kernel, published on 7 Jan 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A use after free in the Linux kernel infiniband hfi1 driver in versions prior to 5.10-rc6 was found in the way user calls Ioctl after open dev file and fork. A local user could use this flaw to crash the system.
Weakness: CWE-416
Which versions are affected by CVE-2020-27835?
It affects 1 product.
Products include Linux Infiniband Hfi1 Driver.
How do I fix CVE-2020-27835?
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-2020-27835 being exploited?
There is no known exploitation of CVE-2020-27835 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2020-27835, GHSA-8pf6-658f-7qh2, UBUNTU-CVE-2020-27835.