CVE-2026-98501 (GCVE-0-2026-98501)
Vulnerability from cvelistv5
Published
2026-10-18 15:16
Modified
2026-10-24 14:09
Severity ?
7.1 (High) - CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: alps: fix use-after-free on input2 registration failure alps_input_configured() stores data->input2 before calling input_register_device(). If registration fails, input_free_device() frees the input device but data->input2 still points to the freed memory. alps_input_configured() calls hid_hw_open() before allocating input2, so URBs are already active and raw_event can fire during the failure window. A U1_SP_ABSOLUTE_REPORT_ID report arriving then causes u1_raw_event() to dereference the freed data->input2 -> use-after-free. Fix by only storing input2 into drvdata after successful registration and adding a NULL guard in the raw_event path.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2562756dde550901c224e3805102bdfc17e7d13a
Version: 2562756dde550901c224e3805102bdfc17e7d13a
Version: 2562756dde550901c224e3805102bdfc17e7d13a
Version: 2562756dde550901c224e3805102bdfc17e7d13a
Version: 2562756dde550901c224e3805102bdfc17e7d13a
Version: 2562756dde550901c224e3805102bdfc17e7d13a
Version: 2562756dde550901c224e3805102bdfc17e7d13a
Version: 2562756dde550901c224e3805102bdfc17e7d13a
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-alps.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "4.8"
            },
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              "version": "0",
              "versionType": "semver"
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              "version": "5.10.271",
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              "lessThanOrEqual": "5.15.*",
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              "version": "5.15.222",
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            {
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              "status": "unaffected",
              "version": "6.1.189",
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              "version": "6.6.158",
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              "version": "6.18.55",
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              "version": "7.2.9",
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            {
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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                  "versionStartIncluding": "4.8",
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: alps: fix use-after-free on input2 registration failure\n\nalps_input_configured() stores data-\u003einput2 before calling\ninput_register_device().  If registration fails, input_free_device()\nfrees the input device but data-\u003einput2 still points to the freed memory.\nalps_input_configured() calls hid_hw_open() before allocating input2, so\nURBs are already active and raw_event can fire during the failure window.\nA U1_SP_ABSOLUTE_REPORT_ID report arriving then causes u1_raw_event()\nto dereference the freed data-\u003einput2 -\u003e use-after-free.\n\nFix by only storing input2 into drvdata after successful registration\nand adding a NULL guard in the raw_event path."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - `alps_id` uses `HID_BUS_ANY`, so a Bluetooth HIDP peer can bind `hid-alps`; its L2CAP ID-6 report follows `hidp_process_report()-\u003ehid_input_report()-\u003ealps_raw_event()-\u003eu1_raw_event()`, which dereferences the pointer left stale by `alps_input_configured()`.\nAC:H - The peer controls stick support and ID-6 report timing, and asynchronous `hidp_session_dev_work()` permits concurrency, but it cannot force `input_register_device(input2)` to fail; that requires a host-side allocation, device-model, or lock-interruption failure.\nPR:N - After the HIDP session is established, `hidp_session_run()` passes peer-supplied interrupt-channel reports to `hid_input_report()` without any per-report host privilege check; the nearby peer needs no kernel credential.\nUI:R - The victim must pair or connect the attacker\u0027s spoofed ALPS Bluetooth HID peer so BlueZ establishes the HIDP session and `hid-alps` probes it; subsequent triggering reports need no further action.\nS:U - The stale `data-\u003einput2` and the memory corrupted through it are host-kernel input-core objects; `u1_raw_event()` crosses no VM, IOMMU, or other security-authority boundary.\nC:H - The freed `struct input_dev` contains `vals`, `grab`, and handler-list pointers; after heap reuse, ID-6 reports drive `input_event()` and `input_pass_values()` through attacker-influenced reclaimed fields, permitting arbitrary kernel-memory disclosure.\nI:H - `input_event_dispose()` writes attacker-selected relative and button values through the reclaimed `input_dev-\u003evals` pointer, while `input_pass_values()` follows reclaimed handler pointers, supporting arbitrary writes and control-flow hijacking.\nA:H - `u1_raw_event()` passes the freed pointer to `input_event()`, which reads `evbit`, takes `event_lock`, and accesses `vals` and handler lists; invalid reclaimed state can immediately cause an oops, panic, or lockup."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:09:09.356Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/64f824dccfd316fd3db8ea1cc4e8a76ad6a02740"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e55d76e6e8a756f6d87c241de975599f82b02fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef8ca5bb4c8b9696f38b1bebce1c851baa02b77b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a8ad63158165bacd6a1d7420e0fe5364c913b06"
        },
        {
          "url": "https://git.kernel.org/stable/c/47e5e177e9e4e10da6f2759d5ce8d049e33efdc4"
        },
        {
          "url": "https://git.kernel.org/stable/c/925da1d2a24787f24872de13a4680437c54de179"
        },
        {
          "url": "https://git.kernel.org/stable/c/443f6b93442b10b972a16f57ceaaea75b77892b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/d3aba3442798ce4a4c8ce3104d7b286d61e605f9"
        }
      ],
      "title": "HID: alps: fix use-after-free on input2 registration failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98501",
    "datePublished": "2026-10-18T15:16:46.205Z",
    "dateReserved": "2026-09-25T10:25:14.353Z",
    "dateUpdated": "2026-10-24T14:09:09.356Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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