286 lines
17 KiB
JSON
286 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64584",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T15:36:31.798Z",
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"datePublished": "2026-08-06T07:06:25.953Z",
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"dateUpdated": "2026-08-19T16:29:12.890Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-19T16:29:12.890Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/usb/gadget/function/f_midi.c"
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],
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"versions": [
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{
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"version": "3635523e9b96213969693c320302d536774d8e9b",
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"lessThan": "f3c6f2c38062703d3dc7f86958bb0790c6959add",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4",
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"lessThan": "df18150126f66817e4d3f79f309e9c92d6ff384e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4",
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"lessThan": "620955b222c47332297d6bf38f78541aa699238a",
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"status": "affected",
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},
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"version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4",
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"lessThan": "380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4",
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"lessThan": "87bc316dd6fc90072297c635e10b9aa6075ecda1",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4",
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"lessThan": "f45089eaad0a083d71d84ff175741d7e157d9b69",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4",
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"lessThan": "ac9a51d910bb7465c554c45320cb6c09f3d0b49d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4",
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"lessThan": "5650c18d93a1db7e27cb5a40b394747eb4686d5b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.10.235",
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"lessThan": "5.10.265",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.4.291",
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"lessThan": "5.5",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/usb/gadget/function/f_midi.c"
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],
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"versions": [
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{
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"version": "5.12",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.12",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.265",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.216",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.183",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.148",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.101",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.42",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.6",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10.235",
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"versionEndExcluding": "5.10.265"
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/f3c6f2c38062703d3dc7f86958bb0790c6959add"
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},
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{
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"url": "https://git.kernel.org/stable/c/df18150126f66817e4d3f79f309e9c92d6ff384e"
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},
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{
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"url": "https://git.kernel.org/stable/c/620955b222c47332297d6bf38f78541aa699238a"
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},
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{
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"url": "https://git.kernel.org/stable/c/380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9"
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},
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{
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"url": "https://git.kernel.org/stable/c/87bc316dd6fc90072297c635e10b9aa6075ecda1"
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},
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{
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"url": "https://git.kernel.org/stable/c/f45089eaad0a083d71d84ff175741d7e157d9b69"
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},
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{
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"url": "https://git.kernel.org/stable/c/ac9a51d910bb7465c554c45320cb6c09f3d0b49d"
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},
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{
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"url": "https://git.kernel.org/stable/c/5650c18d93a1db7e27cb5a40b394747eb4686d5b"
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}
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],
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"title": "usb: gadget: f_midi: cancel pending IN work before freeing the midi object",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |