CVE-2024-58085 tomoyo: don't emit warning in tomoyo_write_control()
A local attacker can trigger a kernel warning and potential resource exhaustion by writing excessively long lines to the TOMOYO control interface.
- 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-2024-58085?
CVE-2024-58085 is a medium-severity denial of service vulnerability in Linux kernel, published on 6 Mar 2025. 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:
tomoyo: don't emit warning in tomoyo_write_control()
syzbot is reporting too large allocation warning at tomoyo_write_control(), for one can write a very very long line without new line character. To fix this warning, I use __GFP_NOWARN rather than checking for KMALLOC_MAX_SIZE, for practically a valid line should be always shorter than 32KB where the "too small to fail" memory-allocation rule applies.
One might try to write a valid line that is longer than 32KB, but such request will likely fail with -ENOMEM. Therefore, I feel that separately returning -EINVAL when a line is longer than KMALLOC_MAX_SIZE is redundant. There is no need to distinguish over-32KB and over-KMALLOC_MAX_SIZE.
Which versions are affected by CVE-2024-58085?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-58085?
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-2024-58085 being exploited?
There is no known exploitation of CVE-2024-58085 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-58085, DEBIAN-CVE-2024-58085, GHSA-hr43-3hq8-ggg4, ROOT-OS-UBUNTU-2404-CVE-2024-58085, UBUNTU-CVE-2024-58085.