{"id":"CVE-2026-89901","summary":"media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref\n\nairspy_disconnect() clears s-\u003eudev under v4l2_lock, but\nairspy_stop_streaming() unconditionally calls airspy_ctrl_msg() and\nairspy_free_stream_bufs() afterwards. If a streaming user closes the\ndevice after disconnect, stop_streaming() runs and dereferences the\nNULL s-\u003eudev:\n\n  airspy_stop_streaming()\n    airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 0, 0, NULL, 0)\n      usb_sndctrlpipe(s-\u003eudev, 0)         /* NULL deref */\n    airspy_free_stream_bufs(s)\n      usb_free_coherent(s-\u003eudev, ...)     /* NULL deref */\n\nThe airspy driver uses vb2_fop_release() in its file_operations, so\nreplace video_unregister_device(&s-\u003evdev) with\nvb2_video_unregister_device(&s-\u003evdev) and move it before clearing\ns-\u003eudev. vb2_video_unregister_device() releases the vb2 queue, which\nsynchronously runs airspy_stop_streaming() if streaming is active, so\nthe URBs, coherent DMA stream buffers and the hardware stop control\nmessage all execute while s-\u003eudev is still valid.\n\nvb2_video_unregister_device() locks vdev-\u003equeue-\u003elock (vb_queue_lock)\ninternally, and stop_streaming() locks v4l2_lock, so the previous outer\nmutex_lock(&s-\u003evb_queue_lock) / mutex_lock(&s-\u003ev4l2_lock) pair around\nthe unregister sequence would self-deadlock and has been removed. A\nshort v4l2_lock critical section around s-\u003eudev = NULL remains so any\nioctl path that still holds the file descriptor sees coherent state.\n\nIssue identified by automated review of the INV-003 series at\nhttps://sashiko.dev/","modified":"2026-09-17T03:47:19.785190093Z","published":"2026-09-16T10:32:00.997Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89901.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/155d0378ae0d6305cc4840583a6b42d2d0595bff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/297fee023f46d771a844520675692ea089d80d9d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2f378dc45e685fc825d2dd08e7864666d6fcc009"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e4ea90fdc6608cd5fac342e146ab6ae15d430bc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/75089cea32e5055773bd13116236d08fdc98678a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a9a8c37ddda9fa3687b142be9098e1c37b8faf35"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c6749ac8f59cc80eb1b2d52f167fdf13e12655cc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c9081e2655188d2d134a741aec837dc70439d505"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89901.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89901"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"634fe5033951b80ef4b98d8f047cb1083d29170d"},{"fixed":"c9081e2655188d2d134a741aec837dc70439d505"},{"fixed":"75089cea32e5055773bd13116236d08fdc98678a"},{"fixed":"155d0378ae0d6305cc4840583a6b42d2d0595bff"},{"fixed":"6e4ea90fdc6608cd5fac342e146ab6ae15d430bc"},{"fixed":"a9a8c37ddda9fa3687b142be9098e1c37b8faf35"},{"fixed":"297fee023f46d771a844520675692ea089d80d9d"},{"fixed":"c6749ac8f59cc80eb1b2d52f167fdf13e12655cc"},{"fixed":"2f378dc45e685fc825d2dd08e7864666d6fcc009"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89901.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.17.0"},{"fixed":"5.10.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.51"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89901.json"}}],"schema_version":"1.9.0"}