{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-64584", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-64584", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-08-06T07:06:25.953Z", "updatedAt": "2026-08-19T16:29:12.890Z", "importedAt": "2026-10-24T01:58:25.636Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "usb: gadget: f_midi: cancel pending IN work before freeing the midi object", "summary": "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.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "3635523e9b96213969693c320302d536774d8e9b", "status": "affected", "versionType": "git", "lessThan": "f3c6f2c38062703d3dc7f86958bb0790c6959add" }, { "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "status": "affected", "versionType": "git", "lessThan": "df18150126f66817e4d3f79f309e9c92d6ff384e" }, { "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "status": "affected", "versionType": "git", "lessThan": "620955b222c47332297d6bf38f78541aa699238a" }, { "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "status": "affected", "versionType": "git", "lessThan": "380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9" }, { "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "status": "affected", "versionType": "git", "lessThan": "87bc316dd6fc90072297c635e10b9aa6075ecda1" }, { "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "status": "affected", "versionType": "git", "lessThan": "f45089eaad0a083d71d84ff175741d7e157d9b69" }, { "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "status": "affected", "versionType": "git", "lessThan": "ac9a51d910bb7465c554c45320cb6c09f3d0b49d" }, { "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4", "status": "affected", "versionType": "git", "lessThan": "5650c18d93a1db7e27cb5a40b394747eb4686d5b" }, { "version": "89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d", "status": "affected", "versionType": "git" }, { "version": "5.10.235", "status": "affected", "versionType": "semver", "lessThan": "5.10.265" }, { "version": "5.4.291", "status": "affected", "versionType": "semver", "lessThan": "5.5" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.12", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.12" }, { "version": "5.10.265", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.216", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.183", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.148", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.101", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.42", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }