CVE-2026-43140 HID: magicmouse: Do not crash on missing msc->input
A missing input pointer in the Magic Mouse driver causes a kernel crash when a fake USB device is connected, leading to denial of service.
- 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-2026-43140?
CVE-2026-43140 is a medium-severity vulnerability in Linux kernel, published on 6 May 2026. 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:
HID: magicmouse: Do not crash on missing msc->input
Fake USB devices can send their own report descriptors for which the input_mapping() hook does not get called. In this case, msc->input stays NULL, leading to a crash at a later time.
Detect this condition in the input_configured() hook and reject the device.
This is not supposed to happen with actual magic mouse devices, but can be provoked by imposing as a magic mouse USB device.
Weakness: CWE-476
Which versions are affected by CVE-2026-43140?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43140?
Apply the vendor's patch.
Is CVE-2026-43140 being exploited?
There is no known exploitation of CVE-2026-43140 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43140, DEBIAN-CVE-2026-43140, GHSA-q3vc-67q5-pp3g, ROOT-OS-DEBIAN-11-CVE-2026-43140, ROOT-OS-UBUNTU-2204-CVE-2026-43140, ROOT-OS-UBUNTU-2404-CVE-2026-43140 and 1 more.