CVE-2024-46745 Input: uinput - reject requests with unreasonable number of slots
An attacker can cause excessive memory allocation and system burden by requesting an unreasonable number of input slots via the uinput 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-2024-46745?
CVE-2024-46745 is a medium-severity denial of service vulnerability in Linux kernel, published on 18 Sep 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:
Input: uinput - reject requests with unreasonable number of slots
When exercising uinput interface syzkaller may try setting up device with a really large number of slots, which causes memory allocation failure in input_mt_init_slots(). While this allocation failure is handled properly and request is rejected, it results in syzkaller reports. Additionally, such request may put undue burden on the system which will try to free a lot of memory for a bogus request.
Fix it by limiting allowed number of slots to 100. This can easily be extended if we see devices that can track more than 100 contacts.
Weakness: CWE-770
Which versions are affected by CVE-2024-46745?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-46745?
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-2024-46745 being exploited?
There is no known exploitation of CVE-2024-46745 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-46745, DEBIAN-CVE-2024-46745, GHSA-23g2-8hr8-76p4, UBUNTU-CVE-2024-46745.