{"api_version":"1","generated_at":"2026-08-09T05:11:16+00:00","cve":"CVE-2026-64584","urls":{"html":"https://cve.report/CVE-2026-64584","api":"https://cve.report/api/cve/CVE-2026-64584.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64584","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64584"},"summary":{"title":"usb: gadget: f_midi: cancel pending IN work before freeing the midi object","description":"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->work) 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->work.\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->free_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->work 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->work 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->work) in the refcount-zero\nblock of f_midi_free(), before the embedded work_struct is freed along\nwith the rest of the structure.  opts->lock is a sleeping mutex, so\ncalling cancel_work_sync() under it is permitted, and the handler takes\nmidi->transmit_lock rather than opts->lock, 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-06 08:16:33","updated_at":"2026-08-08 15:16:33"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/87bc316dd6fc90072297c635e10b9aa6075ecda1","name":"https://git.kernel.org/stable/c/87bc316dd6fc90072297c635e10b9aa6075ecda1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ac9a51d910bb7465c554c45320cb6c09f3d0b49d","name":"https://git.kernel.org/stable/c/ac9a51d910bb7465c554c45320cb6c09f3d0b49d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f45089eaad0a083d71d84ff175741d7e157d9b69","name":"https://git.kernel.org/stable/c/f45089eaad0a083d71d84ff175741d7e157d9b69","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5650c18d93a1db7e27cb5a40b394747eb4686d5b","name":"https://git.kernel.org/stable/c/5650c18d93a1db7e27cb5a40b394747eb4686d5b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9","name":"https://git.kernel.org/stable/c/380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64584","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64584","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8653d71ce3763aedcf3d2331f59beda3fecd79e4 380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8653d71ce3763aedcf3d2331f59beda3fecd79e4 87bc316dd6fc90072297c635e10b9aa6075ecda1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8653d71ce3763aedcf3d2331f59beda3fecd79e4 f45089eaad0a083d71d84ff175741d7e157d9b69 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8653d71ce3763aedcf3d2331f59beda3fecd79e4 ac9a51d910bb7465c554c45320cb6c09f3d0b49d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8653d71ce3763aedcf3d2331f59beda3fecd79e4 5650c18d93a1db7e27cb5a40b394747eb4686d5b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3635523e9b96213969693c320302d536774d8e9b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.4.291 5.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.235 5.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.12","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.148 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.101 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.42 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.6 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc5 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64584","cve":"CVE-2026-64584","epss":"0.001560000","percentile":"0.052520000","score_date":"2026-08-08","updated_at":"2026-08-09 00:07:22"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/usb/gadget/function/f_midi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9","status":"affected","version":"8653d71ce3763aedcf3d2331f59beda3fecd79e4","versionType":"git"},{"lessThan":"87bc316dd6fc90072297c635e10b9aa6075ecda1","status":"affected","version":"8653d71ce3763aedcf3d2331f59beda3fecd79e4","versionType":"git"},{"lessThan":"f45089eaad0a083d71d84ff175741d7e157d9b69","status":"affected","version":"8653d71ce3763aedcf3d2331f59beda3fecd79e4","versionType":"git"},{"lessThan":"ac9a51d910bb7465c554c45320cb6c09f3d0b49d","status":"affected","version":"8653d71ce3763aedcf3d2331f59beda3fecd79e4","versionType":"git"},{"lessThan":"5650c18d93a1db7e27cb5a40b394747eb4686d5b","status":"affected","version":"8653d71ce3763aedcf3d2331f59beda3fecd79e4","versionType":"git"},{"status":"affected","version":"89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d","versionType":"git"},{"status":"affected","version":"3635523e9b96213969693c320302d536774d8e9b","versionType":"git"},{"lessThan":"5.5","status":"affected","version":"5.4.291","versionType":"semver"},{"lessThan":"5.11","status":"affected","version":"5.10.235","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/usb/gadget/function/f_midi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.12"},{"lessThan":"5.12","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.148","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.101","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.42","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc5","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.148","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.101","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.42","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.6","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc5","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.291","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.235","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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->work) 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->work.\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->free_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->work 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->work 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->work) in the refcount-zero\nblock of f_midi_free(), before the embedded work_struct is freed along\nwith the rest of the structure.  opts->lock is a sleeping mutex, so\ncalling cancel_work_sync() under it is permitted, and the handler takes\nmidi->transmit_lock rather than opts->lock, 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."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The UAF is reached by local configfs UDC clear or function unlink (unregister_gadget → f_midi_unbind/disable) plus ALSA rawmidi write/close on /dev/snd/midi*; no USB host traffic or cable access is required, and dummy_hcd suffices, matching other gadget teardown UAFs scored AV:L.\nAC:L - The attacker controls both sides of the race: opening/writing the rawmidi substream to queue midi->work via f_midi_in_trigger after disable, and forcing unbind plus dropping the last free_ref via configfs unlink/close, so the window is freely repeatable.\nPR:L - Exploitation needs access to the gadget configfs tree and/or the ALSA MIDI node; both are routinely delegated to non-root system/audio accounts on Android and embedded MIDI gadgets, with no capability check on the rawmidi write or UDC store path itself.\nUI:N - The attacker performs the full sequence—configfs unbind/unlink, rawmidi write to rearm work, and close to free the midi object—without any action by another user or administrator.\nS:U - The use-after-free corrupts kernel heap within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - f_midi_in_work() container_of()s the freed embedded work_struct and then reads midi->in_ep, fifo, and port/substream fields; reclaiming the freed f_midi slab yields a classic UAF read/disclosure primitive.\nI:H - Post-free f_midi_transmit()/f_midi_drop_out_substreams() write through the reclaimed object (port state, kfifo, snd_rawmidi_drop_output), giving a heap write-after-free primitive suitable for control-flow hijack.\nA:H - Dereferencing the freed f_midi from system_highpri_wq reliably produces KASAN reports, oops, or kernel panic even without full exploitation."}]}],"providerMetadata":{"dateUpdated":"2026-08-08T15:13:21.611Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9"},{"url":"https://git.kernel.org/stable/c/87bc316dd6fc90072297c635e10b9aa6075ecda1"},{"url":"https://git.kernel.org/stable/c/f45089eaad0a083d71d84ff175741d7e157d9b69"},{"url":"https://git.kernel.org/stable/c/ac9a51d910bb7465c554c45320cb6c09f3d0b49d"},{"url":"https://git.kernel.org/stable/c/5650c18d93a1db7e27cb5a40b394747eb4686d5b"}],"title":"usb: gadget: f_midi: cancel pending IN work before freeing the midi object","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64584","datePublished":"2026-08-06T07:06:25.953Z","dateReserved":"2026-07-19T15:36:31.798Z","dateUpdated":"2026-08-08T15:13:21.611Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-06 08:16:33","lastModifiedDate":"2026-08-08 15:16:33","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64584","Ordinal":"1","Title":"usb: gadget: f_midi: cancel pending IN work before freeing the m","CVE":"CVE-2026-64584","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64584","Ordinal":"1","NoteData":"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->work) 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->work.\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->free_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->work 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->work 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->work) in the refcount-zero\nblock of f_midi_free(), before the embedded work_struct is freed along\nwith the rest of the structure.  opts->lock is a sleeping mutex, so\ncalling cancel_work_sync() under it is permitted, and the handler takes\nmidi->transmit_lock rather than opts->lock, 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.","Type":"Description","Title":"usb: gadget: f_midi: cancel pending IN work before freeing the m"}]}}}