CVE-2026-89871

Description

In the Linux kernel, the following vulnerability has been resolved: media: video-i2c: fix kthread error pointer left in kthread_vid_cap on failure kthread_run() returns an ERR_PTR on failure, not NULL. When start_streaming() fails, data->kthread_vid_cap is left holding this error pointer instead of being cleared. This causes two subsequent bugs: 1. A future call to start_streaming() sees a non-NULL kthread_vid_cap and returns 0 (success) immediately, without actually starting the capture thread. 2. A call to stop_streaming() checks 'kthread_vid_cap == NULL' which is false for an error pointer, and proceeds to call kthread_stop() on the error pointer, leading to a kernel crash. Fix this by resetting kthread_vid_cap to NULL on failure before jumping to the error path.

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References

Other References

https://git.kernel.org/stable/c/0e7f2cd72a4f9268ee09a13b13f3339e7cc71557 https://git.kernel.org/stable/c/0fac63cac6689588da530764ccb6ba55ee8e4d8b https://git.kernel.org/stable/c/3d1b10d81fe54852ed953f4129577b733bbd6907 https://git.kernel.org/stable/c/52fd9d80c0cea7bf09e7ee36cad316e5c39b7fe6 https://git.kernel.org/stable/c/5c35d380bea60503c4fe0986fe1de6a3263282b3 https://git.kernel.org/stable/c/76e379754ba618989f6215be608d5c04774a611d https://git.kernel.org/stable/c/968c5213e34c48d35febdfd09cf3dc58ad039140 https://git.kernel.org/stable/c/db0f4531aa55cfb0171684ebfffe3ff04b79d5a8

Frequently Asked Questions

What is CVE-2026-89871? +

In the Linux kernel, the following vulnerability has been resolved: media: video-i2c: fix kthread error pointer left in kthread_vid_cap on failure kthread_run() returns an ERR_PTR on failure, not NULL. When start_streaming() fails, data->kthread_vid_cap is left holding this error pointer instead of being cleared. This causes two subsequent bugs: 1. A future call to start_streaming() sees a non-NULL kthread_vid_cap and returns 0 (success) immediately, without actually starting the capture thread. 2. A call to stop_streaming() checks 'kthread_vid_cap == NULL' which is false for an error pointer, and proceeds to call kthread_stop() on the error pointer, leading to a kernel crash. Fix this by resetting kthread_vid_cap to NULL on failure before jumping to the error path.

How do I check if I'm vulnerable to CVE-2026-89871? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-89871

Description

References

Other References

Frequently Asked Questions

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