CVE-2022-48883 net/mlx5e: IPoIB, Block PKEY interfaces with less rx queues than parent
A user can cause out-of-bounds memory access in the Linux kernel mlx5 driver by creating IPoIB PKEY interfaces with fewer rx queues than the parent.
- 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-2022-48883?
CVE-2022-48883 is a high-severity memory corruption vulnerability in Linux kernel, published on 21 Aug 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/mlx5e: IPoIB, Block PKEY interfaces with less rx queues than parent
A user is able to configure an arbitrary number of rx queues when creating an interface via netlink. This doesn't work for child PKEY interfaces because the child interface uses the parent receive channels.
Although the child shares the parent's receive channels, the number of rx queues is important for the channel_stats array: the parent's rx channel index is used to access the child's channel_stats. So the array has to be at least as large as the parent's rx queue size for the counting to work correctly and to prevent out of bound accesses.
This patch checks for the mentioned scenario and returns an error when trying to create the interface. The error is propagated to the user.
Weakness: CWE-129
Which versions are affected by CVE-2022-48883?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48883?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2022-48883 being exploited?
There is no known exploitation of CVE-2022-48883 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48883, GHSA-4hhg-35c9-5c3m, UBUNTU-CVE-2022-48883.