CVE-2021-47471 drm: mxsfb: Fix NULL pointer dereference crash on unload
A NULL pointer dereference in the mxsfb DRM driver causes a kernel crash when unloading the driver, 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-2021-47471?
CVE-2021-47471 is a medium-severity vulnerability in Linux kernel, published on 22 May 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:
drm: mxsfb: Fix NULL pointer dereference crash on unload
The mxsfb->crtc.funcs may already be NULL when unloading the driver, in which case calling mxsfb_irq_disable() via drm_irq_uninstall() from mxsfb_unload() leads to NULL pointer dereference.
Since all we care about is masking the IRQ and mxsfb->base is still valid, just use that to clear and mask the IRQ.
Weakness: CWE-476
Which versions are affected by CVE-2021-47471?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47471?
Apply the vendor's patch.
Is CVE-2021-47471 being exploited?
There is no known exploitation of CVE-2021-47471 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47471, GHSA-fmqm-f3m4-fg43, UBUNTU-CVE-2021-47471.