CVE-2026-89893media: cx23885: cancel NetUP CI work before teardown

Official description

In the Linux kernel, the following vulnerability has been resolved: media: cx23885: cancel NetUP CI work before teardown netup_ci_exit() frees a netup_ci_state while its work item, netup_read_ci_status(), may still be pending or running on the system workqueue. The worker obtains the state with container_of() and dereferences it, so it must not outlive the state. netup_ci_init() queues the initial status read, and CI GPIO interrupts subsequently queue the same work from netup_ci_slot_status(). During remove, cx23885_finidev() calls free_irq() before the CI device is unregistered. free_irq() prevents further IRQ handlers from running, but does not drain work queued previously, so the worker can run after netup_ci_exit() frees the state. Call cancel_work_sync() before dvb_ca_en50221_release() and kfree(). This issue was found by an in-house static analysis tool.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/aaf76794b870b0f391eff339252a2e2e22f33a4a
• https://git.kernel.org/stable/c/f7ff5adb63c1b277565afa54ccc0924d841b4a52
• https://git.kernel.org/stable/c/140ecbcbf978fbe60f83f8d4f8b1199029a5c763
• https://git.kernel.org/stable/c/ec82b0cf7f75fd95802592dcc9560fc7f529bba4
• https://git.kernel.org/stable/c/5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5
• https://git.kernel.org/stable/c/bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146
• https://git.kernel.org/stable/c/99cd62b9b1c818d6d01a87be9a8e5796314150a2
• https://git.kernel.org/stable/c/4e143d662ca94888b494b2427fc9e34494eb933a