CVE-2024-40939 net: wwan: iosm: Fix tainted pointer delete is case of region creation fail
A use-after-free vulnerability in the Linux kernel's iosm WWAN driver allows attackers to cause a denial of service or potentially execute code when region creation fails.
- 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-2024-40939?
CVE-2024-40939 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:
net: wwan: iosm: Fix tainted pointer delete is case of region creation fail
In case of region creation fail in ipc_devlink_create_region(), previously created regions delete process starts from tainted pointer which actually holds error code value. Fix this bug by decreasing region index before delete.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Weakness: CWE-416
Which versions are affected by CVE-2024-40939?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-40939?
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-2024-40939 being exploited?
There is no known exploitation of CVE-2024-40939 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-40939, DEBIAN-CVE-2024-40939, GHSA-3w6x-jcm9-p8w3, UBUNTU-CVE-2024-40939.