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CVE-2026-89901

media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref PUBLISHED

Description (CNA)

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/

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected 634fe5033951b80ef4b98d8f047cb1083d29170d before c9081e2655188d2d134a741aec837dc70439d505; affected 634fe5033951b80ef4b98d8f047cb1083d29170d before 75089cea32e5055773bd13116236d08fdc98678a; affected 634fe5033951b80ef4b98d8f047cb1083d29170d before 155d0378ae0d6305cc4840583a6b42d2d0595bff; affected 634fe5033951b80ef4b98d8f047cb1083d29170d before 6e4ea90fdc6608cd5fac342e146ab6ae15d430bc; affected 634fe5033951b80ef4b98d8f047cb1083d29170d before a9a8c37ddda9fa3687b142be9098e1c37b8faf35; affected 634fe5033951b80ef4b98d8f047cb1083d29170d before 297fee023f46d771a844520675692ea089d80d9d; affected 634fe5033951b80ef4b98d8f047cb1083d29170d before c6749ac8f59cc80eb1b2d52f167fdf13e12655cc; affected 634fe5033951b80ef4b98d8f047cb1083d29170d before 2f378dc45e685fc825d2dd08e7864666d6fcc009
Linux / Linuxaffected 3.17; unaffected 0 before 3.17; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References