CVE-2026-89901
UnknownSummary
A vulnerability in the Linux kernel's media: airspy driver was fixed, where the wrong function was used on device disconnect. airspy_disconnect() cleared the s->udev pointer while airspy_stop_streaming() still dereferenced it without checking, leading to a NULL dereference. video_unregister_device() was replaced with vb2_video_unregister_device() and moved before clearing s->udev.
Risk Assessment
If a user closes the device after disconnect while streaming is active, the kernel may crash (NULL dereference), causing a denial of service or system instability. This requires physical access to the airspy device and disconnecting it during operation.
Recommendation
Update the Linux kernel to a version containing the fix for CVE-2026-89901. If updating is not possible, avoid disconnecting the airspy device while streaming is active.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref airspy_disconnect() clears s->udev under v4l2_lock, but airspy_stop_streaming() unconditionally calls airspy_ctrl_msg() and airspy_free_stream_bufs() afterwards. If a streaming user closes the device after disconnect, stop_streaming() runs and dereferences the NULL s->udev: airspy_stop_streaming() airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 0, 0, NULL, 0) usb_sndctrlpipe(s->udev, 0) /* NULL deref */ airspy_free_stream_bufs(s) usb_free_coherent(s->udev, ...) /* NULL deref */ The airspy driver uses vb2_fop_release() in its file_operations, so replace video_unregister_device(&s->vdev) with vb2_video_unregister_device(&s->vdev) and move it before clearing s->udev. vb2_video_unregister_device() releases the vb2 queue, which synchronously runs airspy_stop_streaming() if streaming is active, so the URBs, coherent DMA stream buffers and the hardware stop control message all execute while s->udev is still valid. vb2_video_unregister_device() locks vdev->queue->lock (vb_queue_lock) internally, and stop_streaming() locks v4l2_lock, so the previous outer mutex_lock(&s->vb_queue_lock) / mutex_lock(&s->v4l2_lock) pair around the unregister sequence would self-deadlock and has been removed. A short v4l2_lock critical section around s->udev = NULL remains so any ioctl path that still holds the file descriptor sees coherent state. Issue identified by automated review of the INV-003 series at https://sashiko.dev/
Vulnerability data from NVD (NIST) · CISA KEV · EPSS