CVE-2026-98501 (GCVE-0-2026-98501)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:16 – Updated: 2026-10-24 14:09
VLAI
Title
HID: alps: fix use-after-free on input2 registration failure
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.
Severity
7.1 (High)
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6640 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2562756dde550901c224e3805102bdfc17e7d13a , < 64f824dccfd316fd3db8ea1cc4e8a76ad6a02740 (git)
Affected: 2562756dde550901c224e3805102bdfc17e7d13a , < 2e55d76e6e8a756f6d87c241de975599f82b02fa (git)
Affected: 2562756dde550901c224e3805102bdfc17e7d13a , < ef8ca5bb4c8b9696f38b1bebce1c851baa02b77b (git)
Affected: 2562756dde550901c224e3805102bdfc17e7d13a , < 5a8ad63158165bacd6a1d7420e0fe5364c913b06 (git)
Affected: 2562756dde550901c224e3805102bdfc17e7d13a , < 47e5e177e9e4e10da6f2759d5ce8d049e33efdc4 (git)
Affected: 2562756dde550901c224e3805102bdfc17e7d13a , < 925da1d2a24787f24872de13a4680437c54de179 (git)
Affected: 2562756dde550901c224e3805102bdfc17e7d13a , < 443f6b93442b10b972a16f57ceaaea75b77892b6 (git)
Affected: 2562756dde550901c224e3805102bdfc17e7d13a , < d3aba3442798ce4a4c8ce3104d7b286d61e605f9 (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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              "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."
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            "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."
          }
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        "id": "CVE-2026-98501",
        "lastModified": "2026-10-24T14:16:44.773",
        "metrics": {
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              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "ADJACENT_NETWORK",
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                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "published": "2026-10-18T16:17:01.143",
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ef8ca5bb4c8b9696f38b1bebce1c851baa02b77b"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T03:01:57+00:00",
      "cve": "CVE-2026-98501",
      "id": "CVE-2026-98501",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "189",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: HID: alps: fix use-after-free on input2 registration failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98501.json",
      "version": "3"
    }
  }
}



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Sightings

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