CVE-2026-64584 (GCVE-0-2026-64584)

Vulnerability from cvelistv5 – Published: 2026-08-06 07:06 – Updated: 2026-08-06 07:06
VLAI
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: usb: gadget: f_midi: cancel pending IN work before freeing the midi object The f_midi driver embeds a work item (midi->work) whose handler, f_midi_in_work(), dereferences the enclosing struct f_midi through container_of(). This work is armed from two sites: f_midi_complete(), on a normal IN-endpoint completion, and f_midi_in_trigger(), on an ALSA rawmidi output-stream start. Neither f_midi_disable() nor f_midi_unbind() cancels midi->work. f_midi_disable() only disables the endpoints and drains the in_req_fifo; it does not synchronize the work item, and the sound card is released asynchronously to the final free of the midi object. The midi object is reference-counted (midi->free_ref) and is freed in f_midi_free() only once both the usb_function reference and the rawmidi private_data reference have been dropped. In f_midi_unbind(), f_midi_disable() runs before the sound card is released, so while the USB endpoints are already disabled the rawmidi device is still usable by an open substream. A concurrent userspace write on such a substream can reach f_midi_in_trigger() and queue midi->work again after f_midi_disable() has returned. A work item armed this way may still be pending when the last reference drops and f_midi_free() proceeds to kfree(midi), letting f_midi_in_work() dereference the struct after it has been freed, a use-after-free. For this reason cancelling midi->work in f_midi_disable() would not be sufficient: the ALSA trigger path can rearm the work after disable() returns. Cancelling at the refcount-zero free site is the boundary after which neither arming source can survive, because by then both references that keep the midi object alive have been dropped: the USB endpoints are already disabled and the rawmidi device has been released. Fix this by calling cancel_work_sync(&midi->work) in the refcount-zero block of f_midi_free(), before the embedded work_struct is freed along with the rest of the structure. opts->lock is a sleeping mutex, so calling cancel_work_sync() under it is permitted, and the handler takes midi->transmit_lock rather than opts->lock, so no self-deadlock can occur while it waits for a running instance of the work to finish. This issue was found by an in-house static analysis tool.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8653d71ce3763aedcf3d2331f59beda3fecd79e4 , < 380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9 (git)
Affected: 8653d71ce3763aedcf3d2331f59beda3fecd79e4 , < 87bc316dd6fc90072297c635e10b9aa6075ecda1 (git)
Affected: 8653d71ce3763aedcf3d2331f59beda3fecd79e4 , < f45089eaad0a083d71d84ff175741d7e157d9b69 (git)
Affected: 8653d71ce3763aedcf3d2331f59beda3fecd79e4 , < ac9a51d910bb7465c554c45320cb6c09f3d0b49d (git)
Affected: 8653d71ce3763aedcf3d2331f59beda3fecd79e4 , < 5650c18d93a1db7e27cb5a40b394747eb4686d5b (git)
Affected: 89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d (git)
Affected: 3635523e9b96213969693c320302d536774d8e9b (git)
Affected: 5.4.291 , < 5.5 (semver)
Affected: 5.10.235 , < 5.11 (semver)
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Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc5 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_midi.c"
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              "version": "7.2-rc5",
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        {
          "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-\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(\u0026midi-\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."
        }
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        "dateUpdated": "2026-08-06T07:06:25.953Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/87bc316dd6fc90072297c635e10b9aa6075ecda1"
        },
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          "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",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64584",
    "datePublished": "2026-08-06T07:06:25.953Z",
    "dateReserved": "2026-07-19T15:36:31.798Z",
    "dateUpdated": "2026-08-06T07:06:25.953Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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      "cve": "CVE-2026-64584",
      "date": "2026-08-06",
      "epss": "0.00156",
      "percentile": "0.05261"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64584\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-06T08:16:33.543\",\"lastModified\":\"2026-08-06T08:16:33.543\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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-\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(\u0026midi-\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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/gadget/function/f_midi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8653d71ce3763aedcf3d2331f59beda3fecd79e4\",\"lessThan\":\"380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8653d71ce3763aedcf3d2331f59beda3fecd79e4\",\"lessThan\":\"87bc316dd6fc90072297c635e10b9aa6075ecda1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8653d71ce3763aedcf3d2331f59beda3fecd79e4\",\"lessThan\":\"f45089eaad0a083d71d84ff175741d7e157d9b69\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8653d71ce3763aedcf3d2331f59beda3fecd79e4\",\"lessThan\":\"ac9a51d910bb7465c554c45320cb6c09f3d0b49d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8653d71ce3763aedcf3d2331f59beda3fecd79e4\",\"lessThan\":\"5650c18d93a1db7e27cb5a40b394747eb4686d5b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3635523e9b96213969693c320302d536774d8e9b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.4.291\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.10.235\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/gadget/function/f_midi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc5\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/380b4bef46c2eb260c7a9c6bb2c5be33ce5a38f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5650c18d93a1db7e27cb5a40b394747eb4686d5b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/87bc316dd6fc90072297c635e10b9aa6075ecda1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ac9a51d910bb7465c554c45320cb6c09f3d0b49d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f45089eaad0a083d71d84ff175741d7e157d9b69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-08-06T23:56:00Z",
      "cve": "CVE-2026-64584",
      "id": "CVE-2026-64584",
      "initial_release_date": "2026-08-06T23:56:00Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64584",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64584.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.