CVE-2022-48735 ALSA: hda: Fix UAF of leds class devs at unbinding
A use-after-free vulnerability in the Linux kernel ALSA HDA driver allows attackers to cause a denial of service or potentially execute code during device unbinding.
- 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-2022-48735?
CVE-2022-48735 is a high-severity use after free vulnerability in Linux kernel, published on 20 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:
ALSA: hda: Fix UAF of leds class devs at unbinding
The LED class devices that are created by HD-audio codec drivers are registered via devm_led_classdev_register() and associated with the HD-audio codec device. Unfortunately, it turned out that the devres release doesn't work for this case; namely, since the codec resource release happens before the devm call chain, it triggers a NULL dereference or a UAF for a stale set_brightness_delay callback.
For fixing the bug, this patch changes the LED class device register and unregister in a manual manner without devres, keeping the instances in hda_gen_spec.
Which versions are affected by CVE-2022-48735?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48735?
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-2022-48735 being exploited?
There is no known exploitation of CVE-2022-48735 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48735, GHSA-cq4f-h5g8-8r5h, UBUNTU-CVE-2022-48735.