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 6637 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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                "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",
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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": "2026-10-30T07:01:35+00:00",
      "cve": "CVE-2026-98501",
      "id": "CVE-2026-98501",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "265",
      "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T23:49:46Z",
      "cve": "CVE-2026-98501",
      "id": "CVE-2026-98501",
      "initial_release_date": "2026-10-18T23:45:57Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98501",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98501.json",
      "version": "3"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.