CVE-2024-44932 idpf: fix UAFs when destroying the queues
A use-after-free vulnerability in the Linux kernel idpf driver allows attackers to potentially execute code or escalate privileges by exploiting improper memory deallocation order during queue destruction.
- 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-2024-44932?
CVE-2024-44932 is a high-severity use after free vulnerability in Linux kernel, published on 26 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:
idpf: fix UAFs when destroying the queues
The second tagged commit started sometimes (very rarely, but possible) throwing WARNs from net/core/page_pool.c:page_pool_disable_direct_recycling(). Turned out idpf frees interrupt vectors with embedded NAPIs *before* freeing the queues making page_pools' NAPI pointers lead to freed memory before these pools are destroyed by libeth. It's not clear whether there are other accesses to the freed vectors when destroying the queues, but anyway, we usually free queue/interrupt vectors only when the queues are destroyed and the NAPIs are guaranteed to not be referenced anywhere.
Invert the allocation and freeing logic making queue/interrupt vectors be allocated first and freed last. Vectors don't require queues to be present, so this is safe. Additionally, this change allows to remove that useless queue->q_vector pointer cleanup, as vectors are still valid when freeing the queues (+ both are freed within one function, so it's not clear why nullify the pointers at all).
Weakness: CWE-416
Which versions are affected by CVE-2024-44932?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-44932?
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-2024-44932 being exploited?
There is no known exploitation of CVE-2024-44932 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-44932, DEBIAN-CVE-2024-44932, GHSA-h3w8-q2j6-4h9m, ROOT-OS-UBUNTU-2404-CVE-2024-44932, UBUNTU-CVE-2024-44932.