CVE-2022-50317 drm/bridge: megachips: Fix a null pointer dereference bug
A null pointer dereference in the Linux kernel's megachips DRM bridge driver causes a system crash when removing the module.
- 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-2022-50317?
CVE-2022-50317 is a medium-severity vulnerability in Linux kernel, published on 15 Sep 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:
drm/bridge: megachips: Fix a null pointer dereference bug
When removing the module we will get the following warning:
[ 31.911505] i2c-core: driver [stdp2690-ge-b850v3-fw] unregistered [ 31.912484] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI [ 31.913338] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] [ 31.915280] RIP: 0010:drm_bridge_remove+0x97/0x130 [ 31.921825] Call Trace: [ 31.922533] stdp4028_ge_b850v3_fw_remove+0x34/0x60 [megachips_stdpxxxx_ge_b850v3_fw] [ 31.923139] i2c_device_remove+0x181/0x1f0
The two bridges (stdp2690, stdp4028) do not probe at the same time, so the driver does not call ge_b850v3_resgiter() when probing, causing the driver to try to remove the object that has not been initialized.
Fix this by checking whether both the bridges are probed.
Weakness: CWE-476
Which versions are affected by CVE-2022-50317?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-50317?
Apply the vendor's patch.
Is CVE-2022-50317 being exploited?
There is no known exploitation of CVE-2022-50317 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-50317, GHSA-55mc-5j7j-cj82, UBUNTU-CVE-2022-50317.