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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89901
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:16:59 UTC
Updated2026-09-16 11:16:59 UTC
DescriptionIn 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/

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 634fe5033951b80ef4b98d8f047cb1083d29170d c9081e2655188d2d134a741aec837dc70439d505 git Not specified
CNA Linux Linux affected 634fe5033951b80ef4b98d8f047cb1083d29170d 75089cea32e5055773bd13116236d08fdc98678a git Not specified
CNA Linux Linux affected 634fe5033951b80ef4b98d8f047cb1083d29170d 155d0378ae0d6305cc4840583a6b42d2d0595bff git Not specified
CNA Linux Linux affected 634fe5033951b80ef4b98d8f047cb1083d29170d 6e4ea90fdc6608cd5fac342e146ab6ae15d430bc git Not specified
CNA Linux Linux affected 634fe5033951b80ef4b98d8f047cb1083d29170d a9a8c37ddda9fa3687b142be9098e1c37b8faf35 git Not specified
CNA Linux Linux affected 634fe5033951b80ef4b98d8f047cb1083d29170d 297fee023f46d771a844520675692ea089d80d9d git Not specified
CNA Linux Linux affected 634fe5033951b80ef4b98d8f047cb1083d29170d c6749ac8f59cc80eb1b2d52f167fdf13e12655cc git Not specified
CNA Linux Linux affected 634fe5033951b80ef4b98d8f047cb1083d29170d 2f378dc45e685fc825d2dd08e7864666d6fcc009 git Not specified
CNA Linux Linux affected 3.17 Not specified
CNA Linux Linux unaffected 3.17 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c9081e2655188d2d134a741aec837dc70439d505 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/297fee023f46d771a844520675692ea089d80d9d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/75089cea32e5055773bd13116236d08fdc98678a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a9a8c37ddda9fa3687b142be9098e1c37b8faf35 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6e4ea90fdc6608cd5fac342e146ab6ae15d430bc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2f378dc45e685fc825d2dd08e7864666d6fcc009 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/155d0378ae0d6305cc4840583a6b42d2d0595bff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c6749ac8f59cc80eb1b2d52f167fdf13e12655cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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