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CVE-2026-89901

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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/

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 634fe5033951b80ef4b98d8f047cb1083d29170d · fixed in c9081e2655188d2d134a741aec837dc70439d505; From 634fe5033951b80ef4b98d8f047cb1083d29170d · fixed in 75089cea32e5055773bd13116236d08fdc98678a; From 634fe5033951b80ef4b98d8f047cb1083d29170d · fixed in 155d0378ae0d6305cc4840583a6b42d2d0595bff; From 634fe5033951b80ef4b98d8f047cb1083d29170d · fixed in 6e4ea90fdc6608cd5fac342e146ab6ae15d430bc; From 634fe5033951b80ef4b98d8f047cb1083d29170d · fixed in a9a8c37ddda9fa3687b142be9098e1c37b8faf35; From 634fe5033951b80ef4b98d8f047cb1083d29170d · fixed in 297fee023f46d771a844520675692ea089d80d9d; From 634fe5033951b80ef4b98d8f047cb1083d29170d · fixed in c6749ac8f59cc80eb1b2d52f167fdf13e12655cc; From 634fe5033951b80ef4b98d8f047cb1083d29170d · fixed in 2f378dc45e685fc825d2dd08e7864666d6fcc009

  • Linux Linux

    3.17

  • KernelLinux

    From 3.17.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.51; From 6.19.0 · fixed in 7.2.5

References 8

git.kernel.org