CVE-2021-46991 i40e: Fix use-after-free in i40e_client_subtask()
A use-after-free vulnerability in the i40e network driver allows attackers to potentially execute code or cause 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-2021-46991?
CVE-2021-46991 is a high-severity use after free vulnerability in Linux kernel, published on 28 Feb 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:
i40e: Fix use-after-free in i40e_client_subtask()
Currently the call to i40e_client_del_instance frees the object pf->cinst, however pf->cinst->lan_info is being accessed after the free. Fix this by adding the missing return.
Addresses-Coverity: ("Read from pointer after free")
Weakness: CWE-416
Which versions are affected by CVE-2021-46991?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-46991?
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-2021-46991 being exploited?
There is no known exploitation of CVE-2021-46991 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-46991, GHSA-73pj-jqmg-pmr5, UBUNTU-CVE-2021-46991.