CVE-2026-93189 (GCVE-0-2026-93189)
Vulnerability from cvelistv5
Published
2026-09-17 16:12
Modified
2026-10-19 09:07
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: core: quiesce input in hid_hw_stop() to prevent use-after-free A driver's probe calls hid_device_io_start() to enable input delivery, then fails at a later initialization step and unwinds via hid_hw_stop(). The unwind frees struct hidraw via hidraw_disconnect() while in-flight HID reports may still be running on another CPU, dereferencing the freed object through hidraw_report_event(). syzbot reports the resulting use-after-free for the corsair-psu HID driver. Edward Adam Davis posted a per-driver fix for corsair-psu that adds an explicit hid_device_io_stop() before hid_hw_stop() in the probe error path ("hwmon: prevent packets from going to driver for probe", 2026-04-28). Auditing the tree shows 15 drivers call hid_device_io_start(); 7 also call hid_device_io_stop() and 8 do not: drivers calling hid_device_io_start() without a matching hid_device_io_stop() before hid_hw_stop(): drivers/hwmon/corsair-psu.c (fix posted by Edward) drivers/hwmon/corsair-cpro.c drivers/hwmon/nzxt-kraken3.c drivers/hwmon/nzxt-smart2.c drivers/hwmon/gigabyte_waterforce.c drivers/hid/hid-logitech-dj.c drivers/hid/hid-nintendo.c drivers/hid/hid-mcp2221.c Roughly half of all callers of the API are exposed. Centralize the quiesce in hid_hw_stop() so callers do not have to remember the matching stop: if a driver has left hdev->io_started true on entry, call hid_device_io_stop() before hid_disconnect(). For the 7 drivers that already call hid_device_io_stop() correctly, hdev->io_started is false on entry, the guard short-circuits, and behavior is unchanged. No Fixes: tag because the affected drivers gained their hid_device_io_start() calls independently over years; the bug is a class-wide API misuse rather than a regression from one commit.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 0   ≤
Version: 0   ≤
Version: 0   ≤
Version: 0   ≤
Version: 0   ≤
Version: 0   ≤
Version: 0   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: core: quiesce input in hid_hw_stop() to prevent use-after-free\n\nA driver\u0027s probe calls hid_device_io_start() to enable input delivery,\nthen fails at a later initialization step and unwinds via hid_hw_stop().\nThe unwind frees struct hidraw via hidraw_disconnect() while in-flight\nHID reports may still be running on another CPU, dereferencing the\nfreed object through hidraw_report_event(). syzbot reports the\nresulting use-after-free for the corsair-psu HID driver.\n\nEdward Adam Davis posted a per-driver fix for corsair-psu that adds\nan explicit hid_device_io_stop() before hid_hw_stop() in the probe\nerror path (\"hwmon: prevent packets from going to driver for probe\",\n2026-04-28). Auditing the tree shows 15 drivers call\nhid_device_io_start(); 7 also call hid_device_io_stop() and 8 do not:\n\n  drivers calling hid_device_io_start() without a matching\n  hid_device_io_stop() before hid_hw_stop():\n    drivers/hwmon/corsair-psu.c       (fix posted by Edward)\n    drivers/hwmon/corsair-cpro.c\n    drivers/hwmon/nzxt-kraken3.c\n    drivers/hwmon/nzxt-smart2.c\n    drivers/hwmon/gigabyte_waterforce.c\n    drivers/hid/hid-logitech-dj.c\n    drivers/hid/hid-nintendo.c\n    drivers/hid/hid-mcp2221.c\n\nRoughly half of all callers of the API are exposed. Centralize the\nquiesce in hid_hw_stop() so callers do not have to remember the\nmatching stop: if a driver has left hdev-\u003eio_started true on entry,\ncall hid_device_io_stop() before hid_disconnect().\n\nFor the 7 drivers that already call hid_device_io_stop() correctly,\nhdev-\u003eio_started is false on entry, the guard short-circuits, and\nbehavior is unchanged.\n\nNo Fixes: tag because the affected drivers gained their\nhid_device_io_start() calls independently over years; the bug is a\nclass-wide API misuse rather than a regression from one commit."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - HIDP interrupt payloads racing hid_hw_stop() enter via hidp_recv_intr_frame() -\u003e hidp_process_report() -\u003e hid_input_report() -\u003e hid_report_raw_event() -\u003e hidraw_report_event(). nintendo_hid_probe() matches HID_BLUETOOTH_DEVICE Joy-Con/Pro IDs after hidp_session_dev_add()-\u003ehid_add_device(), so those reports come from a radio-adjacent HIDP peer.\nAC:L - After hid_device_io_start() in nintendo_hid_probe(), the peer fails joycon_init() (joycon_read_info() or joycon_set_report_mode()) so err_close calls hid_hw_stop() without hid_device_io_stop(), and concurrently sends HIDP_TRANS_DATA|HIDP_DATA_RTYPE_INPUT frames so hidraw_report_event() runs during hidraw_disconnect(); the attacker drives both sides.\nPR:N - hid_device_probe() binds the HID device with no host uid or capability check. A Bluetooth HID peripheral delivering hidp interrupt frames needs no Linux account; CAP_NET_ADMIN is only for bluetoothd HIDPCONNADD, not for the reporting device.\nUI:N - hidp_session_dev_work() calls hidp_session_dev_add()-\u003ehid_add_device(), which runs nintendo_hid_probe() automatically; after hid_device_io_start(), the peer\u0027s interrupt reports and the probe-fail hid_hw_stop() path need no victim open, mount, or click.\nS:U - The use-after-free is of host-kernel struct hidraw inside hid_hw_stop()-\u003ehid_disconnect()-\u003ehidraw_disconnect()-\u003edrop_ref(); it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - hid_report_raw_event() can enter hidraw_report_event() and take hidraw-\u003elist_lock on the object already kfree\u0027d by drop_ref() from hid_hw_stop()\u0027s hidraw_disconnect(), a use-after-free reusable for an arbitrary kernel read.\nI:H - The same freed hidraw is written from hidraw_report_event() (list_lock, kmemdup into list buffers, wake_up_interruptible on hidraw-\u003ewait) and can be sprayed, yielding an arbitrary write or control-flow hijack primitive.\nA:H - hidraw_report_event() taking the freed hidraw-\u003elist_lock or waking hidraw-\u003ewait after drop_ref()\u0027s kfree oopses or panics the kernel even when the UAF is not fully exploited."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:07:01.914Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0744cb9520aade37e78f69134f3111086158f1d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/c876c437d188911685d8bed645416f2e86bd0354"
        },
        {
          "url": "https://git.kernel.org/stable/c/6787f1828f5616f17250e108c0031fb96fd2cfe6"
        },
        {
          "url": "https://git.kernel.org/stable/c/92cca302a4eaf65d1b38b3fb600b4ee5eb856a51"
        },
        {
          "url": "https://git.kernel.org/stable/c/02246d8b462fd9bd90bc7ae7d6cab1acf69bcb87"
        },
        {
          "url": "https://git.kernel.org/stable/c/544ebb25bd58f67e821573412ab7a982b9e02211"
        },
        {
          "url": "https://git.kernel.org/stable/c/0fecd89f979a8653b9a5b0816570329b7a94a081"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4bc41504690b7d7064931909874f5b98cd148b6"
        }
      ],
      "title": "HID: core: quiesce input in hid_hw_stop() to prevent use-after-free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93189",
    "datePublished": "2026-09-17T16:12:14.234Z",
    "dateReserved": "2026-09-17T16:02:15.091Z",
    "dateUpdated": "2026-10-19T09:07:01.914Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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