CVE-2024-40956 dmaengine: idxd: Fix possible Use-After-Free in irq_process_work_list
A use-after-free flaw in the Linux kernel's idxd driver allows attackers to potentially execute code or escalate privileges via race conditions.
- 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-2024-40956?
CVE-2024-40956 is a high-severity use after free vulnerability in Linux kernel, published on 12 Jul 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:
dmaengine: idxd: Fix possible Use-After-Free in irq_process_work_list
Use list_for_each_entry_safe() to allow iterating through the list and deleting the entry in the iteration process. The descriptor is freed via idxd_desc_complete() and there's a slight chance may cause issue for the list iterator when the descriptor is reused by another thread without it being deleted from the list.
Weakness: CWE-416
Which versions are affected by CVE-2024-40956?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-40956?
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-2024-40956 being exploited?
There is no known exploitation of CVE-2024-40956 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-40956, DEBIAN-CVE-2024-40956, GHSA-xqjr-37f7-78rr, UBUNTU-CVE-2024-40956.