HID: appleir: fix UAF on pending key_up_timer in remove()

{
  "id": "a9f6ede62766e85ea76851286e86b7933b356bcb95e55178684f20f1c0cd56c3",
  "url": "https://osv.dev/vulnerability/CVE-2026-64363",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HID: appleir: fix UAF on pending key_up_timer in remove()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: HID: appleir: fix UAF on pending key_up_timer in remove() appleir_remove() runs hid_hw_stop() before timer_delete_sync(). hid_hw_stop() synchronously unregisters the HID input device via hid_disconnect() -> hidinput_disconnect() -> input_unregister_device(), which drops the last reference and frees the underlying input_dev when no userspace handle holds it open. key_up_tick() reads appleir->input_dev and calls input_report_key() / input_sync() on it. The timer is armed from appleir_raw_event() with a HZ/8 (~125 ms) timeout on every keydown and key-repeat report. If a key was pressed shortly before the device is disconnected, the timer can fire after hid_hw_stop() has freed input_dev but before the teardown drains it. A simple reorder is not sufficient. Putting the timer drain first still leaves a window where a USB URB completion (raw_event) running during hid_hw_stop() can call mod_timer() and re-arm the timer, which then fires after hidinput_disconnect() has freed input_dev. The same URB-completion window also lets raw_event() reach key_up(), key_down() and battery_flat() directly, all of which dereference appleir->input_dev. Introduce a 'removing' flag on struct appleir, gated by the existing spinlock. appleir_remove() sets the flag under the lock and then shuts down the timer with timer_shutdown_sync(), which both drains any in-flight callback and permanently disables further mod_timer() calls. appleir_ra",
    "evidence": "osv:CVE-2026-64363",
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    "severity": "unknown",
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      "aliases": [
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      "modified": "2026-10-28T02:30:41.532895076Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/05e3decc55d1deca9410e0eb36466651fcbe57a5",
        "https://git.kernel.org/stable/c/3755f6e25776b8b12ddf062f9b573f05090e4034",
        "https://git.kernel.org/stable/c/37a52c61d4f78153c38ae1f7491dfcc8ac828dcf",
        "https://git.kernel.org/stable/c/3d30a0bb0e79621ae921b487835c56198adfafa3",
        "https://git.kernel.org/stable/c/6b0838e86da88b1d3bff86f19761ff25af73eaca",
        "https://git.kernel.org/stable/c/75fe87e19d8aff81eb2c64d15d244ab8da4de945",
        "https://git.kernel.org/stable/c/89ef67359672bf4cd6921524e39f61648fe38c0f",
        "https://git.kernel.org/stable/c/b363d964ca829c1761c9f04188dfa28f90b0f2d4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64363.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64363",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64363.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2026-64363",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 508821,
  "published_at": "2026-07-25T08:50:18.824+00:00"
}