{"id":"CVE-2026-64584","summary":"usb: gadget: f_midi: cancel pending IN work before freeing the midi object","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_midi: cancel pending IN work before freeing the midi object\n\nThe f_midi driver embeds a work item (midi-\u003ework) whose handler,\nf_midi_in_work(), dereferences the enclosing struct f_midi through\ncontainer_of().  This work is armed from two sites: f_midi_complete(),\non a normal IN-endpoint completion, and f_midi_in_trigger(), on an ALSA\nrawmidi output-stream start.\n\nNeither f_midi_disable() nor f_midi_unbind() cancels midi-\u003ework.\nf_midi_disable() only disables the endpoints and drains the in_req_fifo;\nit does not synchronize the work item, and the sound card is released\nasynchronously to the final free of the midi object.\n\nThe midi object is reference-counted (midi-\u003efree_ref) and is freed in\nf_midi_free() only once both the usb_function reference and the rawmidi\nprivate_data reference have been dropped.  In f_midi_unbind(),\nf_midi_disable() runs before the sound card is released, so while the\nUSB endpoints are already disabled the rawmidi device is still usable by\nan open substream.  A concurrent userspace write on such a substream can\nreach f_midi_in_trigger() and queue midi-\u003ework again after\nf_midi_disable() has returned.  A work item armed this way may still be\npending when the last reference drops and f_midi_free() proceeds to\nkfree(midi), letting f_midi_in_work() dereference the struct after it\nhas been freed, a use-after-free.\n\nFor this reason cancelling midi-\u003ework in f_midi_disable() would not be\nsufficient: the ALSA trigger path can rearm the work after disable()\nreturns.  Cancelling at the refcount-zero free site is the boundary\nafter which neither arming source can survive, because by then both\nreferences that keep the midi object alive have been dropped: the USB\nendpoints are already disabled and the rawmidi device has been released.\n\nFix this by calling cancel_work_sync(&midi-\u003ework) in the refcount-zero\nblock of f_midi_free(), before the embedded work_struct is freed along\nwith the rest of the structure.  opts-\u003elock is a sleeping mutex, so\ncalling cancel_work_sync() under it is permitted, and the handler takes\nmidi-\u003etransmit_lock rather than opts-\u003elock, so no self-deadlock can\noccur while it waits for a running instance of the work to finish.\n\nThis issue was found by an in-house static analysis tool.","modified":"2026-08-09T03:47:26.565950895Z","published":"2026-08-06T07:06:25.953Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64584.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5650c18d93a1db7e27cb5a40b394747eb4686d5b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/87bc316dd6fc90072297c635e10b9aa6075ecda1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ac9a51d910bb7465c554c45320cb6c09f3d0b49d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f45089eaad0a083d71d84ff175741d7e157d9b69"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64584.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64584"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8653d71ce3763aedcf3d2331f59beda3fecd79e4"},{"fixed":"380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9"},{"fixed":"87bc316dd6fc90072297c635e10b9aa6075ecda1"},{"fixed":"f45089eaad0a083d71d84ff175741d7e157d9b69"},{"fixed":"ac9a51d910bb7465c554c45320cb6c09f3d0b49d"},{"fixed":"5650c18d93a1db7e27cb5a40b394747eb4686d5b"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d"},{"last_affected":"3635523e9b96213969693c320302d536774d8e9b"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.291"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.235"},{"fixed":"5.11"}]}],"versions":["v5.10.234","v5.4.290","v5.10.233","v5.4.289","v5.10.232","v5.4.288","v5.10.231","v5.4.287","v5.10.230","v5.4.286","v5.10.229","v5.4.285","v5.10.228","v5.4.284","v5.10.227","v5.10.226","v5.10.225","v5.4.283","v5.10.224","v5.4.282","v5.10.223","v5.4.281","v5.10.222","v5.4.280","v5.10.221","v5.4.279","v5.10.220","v5.4.278","v5.10.219","v5.10.218","v5.4.277","v5.10.217","v5.4.276","v5.10.216","v5.4.275","v5.10.215","v5.4.274","v5.10.214","v5.4.273","v5.4.272","v5.10.213","v5.10.212","v5.4.271","v5.10.211","v5.4.270","v5.10.210","v5.4.269","v5.10.209","v5.4.268","v5.10.208","v5.4.267","v5.10.207","v5.4.266","v5.10.206","v5.4.265","v5.10.205","v5.10.204","v5.4.264","v5.10.203","v5.4.263","v5.10.202","v5.4.262","v5.10.201","v5.4.261","v5.10.200","v5.4.260","v5.10.199","v5.4.259","v5.10.198","v5.4.258","v5.10.197","v5.4.257","v5.10.196","v5.4.256","v5.10.195","v5.10.194","v5.4.255","v5.10.193","v5.4.254","v5.10.192","v5.10.191","v5.10.190","v5.4.253","v5.10.189","v5.4.252","v5.10.188","v5.4.251","v5.10.187","v5.4.250","v5.4.249","v5.10.186","v5.10.185","v5.4.248","v5.10.184","v5.4.247","v5.10.183","v5.4.246","v5.10.182","v5.4.245","v5.10.181","v5.4.244","v5.10.180","v5.4.243","v5.10.179","v5.4.242","v5.10.178","v5.4.241","v5.10.177","v5.4.240","v5.10.176","v5.4.239","v5.4.238","v5.10.175","v5.4.237","v5.10.174","v5.4.236","v5.10.173","v5.4.235","v5.4.234","v5.10.172","v5.10.171","v5.10.170","v5.4.233","v5.10.169","v5.4.232","v5.10.168","v5.4.231","v5.10.167","v5.10.166","v5.4.230","v5.10.165","v5.10.164","v5.4.229","v5.10.163","v5.4.228","v5.10.162","v5.10.161","v5.10.160","v5.10.159","v5.4.227","v5.10.158","v5.4.226","v5.10.157","v5.4.225","v5.10.156","v5.10.155","v5.4.224","v5.10.154","v5.10.153","v5.4.223","v5.10.152","v5.4.222","v5.4.221","v5.10.151","v5.4.220","v5.10.150","v5.10.149","v5.4.219","v5.10.148","v5.4.218","v5.10.147","v5.4.217","v5.4.216","v5.10.146","v5.4.215","v5.10.145","v5.4.214","v5.10.144","v5.10.143","v5.4.213","v5.4.212","v5.10.142","v5.10.141","v5.10.140","v5.4.211","v5.10.139","v5.10.138","v5.10.137","v5.4.210","v5.10.136","v5.10.135","v5.4.209","v5.10.134","v5.4.208","v5.10.133","v5.4.207","v5.10.132","v5.10.131","v5.4.206","v5.4.205","v5.10.130","v5.10.129","v5.4.204","v5.10.128","v5.4.203","v5.10.127","v5.4.202","v5.10.126","v5.4.201","v5.10.125","v5.10.124","v5.4.200","v5.10.123","v5.4.199","v5.10.122","v5.4.198","v5.10.121","v5.4.197","v5.10.120","v5.10.119","v5.4.196","v5.10.118","v5.10.117","v5.4.195","v5.10.116","v5.4.194","v5.10.115","v5.4.193","v5.10.114","v5.4.192","v5.10.113","v5.4.191","v5.10.112","v5.4.190","v5.10.111","v5.4.189","v5.4.188","v5.10.110","v5.10.109","v5.10.108","v5.4.187","v5.10.107","v5.4.186","v5.10.106","v5.4.185","v5.10.105","v5.4.184","v5.10.104","v5.4.183","v5.10.103","v5.4.182","v5.10.102","v5.4.181","v5.10.101","v5.4.180","v5.10.100","v5.4.179","v5.10.99","v5.4.178","v5.10.98","v5.4.177","v5.10.97","v5.10.96","v5.4.176","v5.10.95","v5.4.175","v5.10.94","v5.4.174","v5.10.93","v5.4.173",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