CVE-2022-48874 misc: fastrpc: Fix use-after-free and race in fastrpc_map_find
A race condition in the Linux kernel's fastrpc driver allows use-after-free, potentially enabling local attackers to execute 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-2022-48874?
CVE-2022-48874 is a high-severity use after free 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:
misc: fastrpc: Fix use-after-free and race in fastrpc_map_find
Currently, there is a race window between the point when the mutex is unlocked in fastrpc_map_lookup and the reference count increasing (fastrpc_map_get) in fastrpc_map_find, which can also lead to use-after-free.
So lets merge fastrpc_map_find into fastrpc_map_lookup which allows us to both protect the maps list by also taking the &fl->lock spinlock and the reference count, since the spinlock will be released only after. Add take_ref argument to make this suitable for all callers.
Weakness: CWE-416
Which versions are affected by CVE-2022-48874?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48874?
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-2022-48874 being exploited?
There is no known exploitation of CVE-2022-48874 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48874, GHSA-5v94-m7ff-m26p, UBUNTU-CVE-2022-48874.