CVE-2022-49076 RDMA/hfi1: Fix use-after-free bug for mm struct
A use-after-free bug in the Linux kernel RDMA driver allows attackers to cause system hangs or memory corruption, potentially leading to denial of service or code execution.
- 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-2022-49076?
CVE-2022-49076 is a high-severity use after free vulnerability in Linux kernel, published on 26 Feb 2025. 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:
RDMA/hfi1: Fix use-after-free bug for mm struct
Under certain conditions, such as MPI_Abort, the hfi1 cleanup code may represent the last reference held on the task mm. hfi1_mmu_rb_unregister() then drops the last reference and the mm is freed before the final use in hfi1_release_user_pages(). A new task may allocate the mm structure while it is still being used, resulting in problems. One manifestation is corruption of the mmap_sem counter leading to a hang in down_write(). Another is corruption of an mm struct that is in use by another task.
Weakness: CWE-416
Which versions are affected by CVE-2022-49076?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49076?
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-2022-49076 being exploited?
There is no known exploitation of CVE-2022-49076 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49076, GHSA-87jq-rxj7-28vf, UBUNTU-CVE-2022-49076.