CVE-2022-50359 media: cx88: Fix a null-ptr-deref bug in buffer_prepare()
A null pointer dereference in the cx88 media driver can cause a kernel crash, 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-2022-50359?
CVE-2022-50359 is a medium-severity vulnerability in Linux kernel, published on 17 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:
media: cx88: Fix a null-ptr-deref bug in buffer_prepare()
When the driver calls cx88_risc_buffer() to prepare the buffer, the function call may fail, resulting in a empty buffer and null-ptr-deref later in buffer_queue().
The following log can reveal it:
[ 41.822762] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI [ 41.824488] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 41.828027] RIP: 0010:buffer_queue+0xc2/0x500 [ 41.836311] Call Trace: [ 41.836945] __enqueue_in_driver+0x141/0x360 [ 41.837262] vb2_start_streaming+0x62/0x4a0 [ 41.838216] vb2_core_streamon+0x1da/0x2c0 [ 41.838516] __vb2_init_fileio+0x981/0xbc0 [ 41.839141] __vb2_perform_fileio+0xbf9/0x1120 [ 41.840072] vb2_fop_read+0x20e/0x400 [ 41.840346] v4l2_read+0x215/0x290 [ 41.840603] vfs_read+0x162/0x4c0
Fix this by checking the return value of cx88_risc_buffer()
[hverkuil: fix coding style issues]
Weakness: CWE-476
Which versions are affected by CVE-2022-50359?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-50359?
Apply the vendor's patch.
Is CVE-2022-50359 being exploited?
There is no known exploitation of CVE-2022-50359 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-50359, GHSA-pp7m-7xwh-j3h9, UBUNTU-CVE-2022-50359.