CVE-2022-50359
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-17

Last updated on: 2025-12-09

Assigner: kernel.org

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]
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Meta Information
Published
2025-09-17
Last Modified
2025-12-09
Generated
2026-06-16
AI Q&A
2025-09-17
EPSS Evaluated
2026-06-14
NVD
CVE-2022-50359
Affected Vendors & Products
Showing 8 associated CPEs
Vendor Product Version / Range
linux linux_kernel to 4.9.331 (exc)
linux linux_kernel From 4.10 (inc) to 4.14.296 (exc)
linux linux_kernel From 4.15 (inc) to 4.19.262 (exc)
linux linux_kernel From 4.20 (inc) to 5.4.220 (exc)
linux linux_kernel From 5.5 (inc) to 5.10.150 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.75 (exc)
linux linux_kernel From 5.16 (inc) to 5.19.17 (exc)
linux linux_kernel From 6.0 (inc) to 6.0.3 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
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Executive Summary

This vulnerability is a null pointer dereference bug in the Linux kernel's cx88 media driver. When the driver calls the function cx88_risc_buffer() to prepare a buffer, the call may fail and return an empty buffer. Later, when buffer_queue() tries to use this buffer without checking if it is valid, it dereferences a null pointer, causing a kernel crash or general protection fault.

Impact Analysis

This vulnerability can cause the Linux kernel to crash or experience a general protection fault, leading to system instability or denial of service. It affects systems using the cx88 media driver, potentially interrupting media-related operations or causing unexpected reboots.

Detection Guidance

This vulnerability can be detected by monitoring the system logs for specific kernel error messages indicating a null pointer dereference related to the cx88 driver. Look for log entries similar to: "general protection fault, probably for non-canonical address", "KASAN: null-ptr-deref", and stack traces involving buffer_queue and cx88_risc_buffer. You can use the command 'dmesg | grep -iE "general protection fault|KASAN|buffer_queue|cx88"' to search the kernel ring buffer for these signs.

Mitigation Strategies

Immediate mitigation involves updating the Linux kernel to a version where the cx88 driver has been patched to properly check the return value of cx88_risc_buffer(), preventing the null pointer dereference. Until an update is applied, avoid using the cx88 driver or the affected media functionality to prevent triggering the bug.

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