CVE-2021-47616 RDMA: Fix use-after-free in rxe_queue_cleanup
A use-after-free vulnerability in the Linux kernel's RDMA subsystem allows attackers to potentially 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-2021-47616?
CVE-2021-47616 is a high-severity use after free vulnerability in Linux kernel, published on 19 Jun 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:
RDMA: Fix use-after-free in rxe_queue_cleanup
On error handling path in rxe_qp_from_init() qp->sq.queue is freed and then rxe_create_qp() will drop last reference to this object. qp clean up function will try to free this queue one time and it causes UAF bug.
Fix it by zeroing queue pointer after freeing queue in rxe_qp_from_init().
Weakness: CWE-416
Which versions are affected by CVE-2021-47616?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47616?
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-2021-47616 being exploited?
There is no known exploitation of CVE-2021-47616 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47616, GHSA-33h3-4p7j-r54j, UBUNTU-CVE-2021-47616.