CVE-2026-89871

Summary

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

VendorProductVersion RangeStatus
LinuxLinux5cebaac609744414463d1ecc28fdecd26c1b9bc1 < db0f4531aa55cfb0171684ebfffe3ff04b79d5a8affected
LinuxLinux5cebaac609744414463d1ecc28fdecd26c1b9bc1 < 0fac63cac6689588da530764ccb6ba55ee8e4d8baffected
LinuxLinux5cebaac609744414463d1ecc28fdecd26c1b9bc1 < 5c35d380bea60503c4fe0986fe1de6a3263282b3affected
LinuxLinux5cebaac609744414463d1ecc28fdecd26c1b9bc1 < 3d1b10d81fe54852ed953f4129577b733bbd6907affected
LinuxLinux5cebaac609744414463d1ecc28fdecd26c1b9bc1 < 968c5213e34c48d35febdfd09cf3dc58ad039140affected
LinuxLinux5cebaac609744414463d1ecc28fdecd26c1b9bc1 < 52fd9d80c0cea7bf09e7ee36cad316e5c39b7fe6affected
LinuxLinux5cebaac609744414463d1ecc28fdecd26c1b9bc1 < 0e7f2cd72a4f9268ee09a13b13f3339e7cc71557affected
LinuxLinux5cebaac609744414463d1ecc28fdecd26c1b9bc1 < 76e379754ba618989f6215be608d5c04774a611daffected
LinuxLinux4.18affected
LinuxLinux0 < 4.18unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References