CVE-2024-39484 mmc: davinci: Don't strip remove function when driver is builtin
A resource leak in the Linux kernel MMC driver can lead to denial of service when the driver is unbound while built-in.
- 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-2024-39484?
CVE-2024-39484 is a medium-severity denial of service vulnerability in Linux kernel, published on 5 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:
mmc: davinci: Don't strip remove function when driver is builtin
Using __exit for the remove function results in the remove callback being discarded with CONFIG_MMC_DAVINCI=y. When such a device gets unbound (e.g. using sysfs or hotplug), the driver is just removed without the cleanup being performed. This results in resource leaks. Fix it by compiling in the remove callback unconditionally.
This also fixes a W=1 modpost warning:
WARNING: modpost: drivers/mmc/host/davinci_mmc: section mismatch in reference: davinci_mmcsd_driver+0x10 (section: .data) -> davinci_mmcsd_remove (section: .exit.text)
Weakness: CWE-770
Which versions are affected by CVE-2024-39484?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-39484?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-39484 being exploited?
There is no known exploitation of CVE-2024-39484 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-43288, BELL-CVE-2024-39484, DEBIAN-CVE-2024-39484, GHSA-v9c2-2jfc-5c5c, UBUNTU-CVE-2024-39484.