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/
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/
Metrics
Affected Vendors & Products
Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Wed, 16 Sep 2026 10:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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/ | |
| Title | media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
|
Projects
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MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-09-16T10:32:00.997Z
Reserved: 2026-09-11T19:38:34.774Z
Link: CVE-2026-89901
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-16T11:16:59.003
Modified: 2026-09-16T11:16:59.003
Link: CVE-2026-89901
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.