{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64363",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-64363"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "HID: appleir: fix UAF on pending key_up_timer in remove()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: appleir: fix UAF on pending key_up_timer in remove()\n\nappleir_remove() runs hid_hw_stop() before timer_delete_sync().\nhid_hw_stop() synchronously unregisters the HID input device via\nhid_disconnect() -> hidinput_disconnect() -> input_unregister_device(),\nwhich drops the last reference and frees the underlying input_dev when\nno userspace handle holds it open.\n\nkey_up_tick() reads appleir->input_dev and calls input_report_key() /\ninput_sync() on it.  The timer is armed from appleir_raw_event() with\na HZ/8 (~125 ms) timeout on every keydown and key-repeat report.  If a\nkey was pressed shortly before the device is disconnected, the timer\ncan fire after hid_hw_stop() has freed input_dev but before the\nteardown drains it.\n\nA simple reorder is not sufficient.  Putting the timer drain first\nstill leaves a window where a USB URB completion (raw_event) running\nduring hid_hw_stop() can call mod_timer() and re-arm the timer, which\nthen fires after hidinput_disconnect() has freed input_dev.  The same\nURB-completion window also lets raw_event() reach key_up(), key_down()\nand battery_flat() directly, all of which dereference\nappleir->input_dev.\n\nIntroduce a 'removing' flag on struct appleir, gated by the existing\nspinlock.  appleir_remove() sets the flag under the lock and then\nshuts down the timer with timer_shutdown_sync(), which both drains any\nin-flight callback and permanently disables further mod_timer() calls.\nappleir_raw_event() and key_up_tick() bail out early if the flag is\nset, so no path can arm or run the timer, or dereference\nappleir->input_dev, after remove() has started tearing down.\n\nThe keyrepeat and flatbattery branches of appleir_raw_event()\npreviously called into the input layer without holding the spinlock;\ntake it now so the flag check is well-defined.  This incidentally\ncloses a pre-existing read-side race on appleir->current_key in the\nkeyrepeat branch.\n\nThis bug is structurally a sibling of commit 4db2af929279 (\"HID:\nappletb-kbd: fix UAF in inactivity-timer cleanup path\") and has been\npresent since the driver was introduced.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64363"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/89ef67359672bf4cd6921524e39f61648fe38c0f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3d30a0bb0e79621ae921b487835c56198adfafa3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/37a52c61d4f78153c38ae1f7491dfcc8ac828dcf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/05e3decc55d1deca9410e0eb36466651fcbe57a5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3755f6e25776b8b12ddf062f9b573f05090e4034"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b363d964ca829c1761c9f04188dfa28f90b0f2d4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6b0838e86da88b1d3bff86f19761ff25af73eaca"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/75fe87e19d8aff81eb2c64d15d244ab8da4de945"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z"
  }
}