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CVE-2026-89871

Unknown

Last modified

CVE-2026-89871 is a vulnerability of currently unknown severity. 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.

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 5cebaac609744414463d1ecc28fdecd26c1b9bc1, < db0f4531aa55cfb0171684ebfffe3ff04b79d5a8; >= 5cebaac609744414463d1ecc28fdecd26c1b9bc1, < 0fac63cac6689588da530764ccb6ba55ee8e4d8b; >= 5cebaac609744414463d1ecc28fdecd26c1b9bc1, < 5c35d380bea60503c4fe0986fe1de6a3263282b3; >= 5cebaac609744414463d1ecc28fdecd26c1b9bc1, < 3d1b10d81fe54852ed953f4129577b733bbd6907; >= 5cebaac609744414463d1ecc28fdecd26c1b9bc1, < 968c5213e34c48d35febdfd09cf3dc58ad039140; >= 5cebaac609744414463d1ecc28fdecd26c1b9bc1, < 52fd9d80c0cea7bf09e7ee36cad316e5c39b7fe6; >= 5cebaac609744414463d1ecc28fdecd26c1b9bc1, < 0e7f2cd72a4f9268ee09a13b13f3339e7cc71557; >= 5cebaac609744414463d1ecc28fdecd26c1b9bc1, < 76e379754ba618989f6215be608d5c04774a611d
LinuxLinux4.18

References

Timeline

Published
Last Modified
Status
Received

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 severe is CVE-2026-89871?
Severity scoring for CVE-2026-89871 is pending analysis.
How do I fix CVE-2026-89871?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST