Vulnerability-Lookup

GHSA-FHX7-57XW-QFJC

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-24 15:32

Details

In the Linux kernel, the following vulnerability has been resolved:

HID: steam: Rearrange teardown sequence

This fixes a narrow window during the teardown sequence where callbacks could still be scheduled during cleanup that would then have a dangling pointer to the now-freed steam struct.

This also puts work canceling for rumble and mode switch in steam_unregister, as that shouldn't persist while the client hdev is open.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98945"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:15Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: steam: Rearrange teardown sequence\n\nThis fixes a narrow window during the teardown sequence where callbacks\ncould still be scheduled during cleanup that would then have a dangling\npointer to the now-freed steam struct.\n\nThis also puts work canceling for rumble and mode switch in\nsteam_unregister, as that shouldn\u0027t persist while the client hdev is open.",
  "id": "GHSA-fhx7-57xw-qfjc",
  "modified": "2026-10-24T15:32:47Z",
  "published": "2026-10-23T15:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98945"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81a8209c09f9be7eef860ca6cc154749a6b4d243"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86724f4bcf6049c3a322f7a7b1f968210059c46a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5ea938ff776306798d3a11485c2475034f92131"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2587923d50c8b141ce0ccb284c714cf6054d6a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ddce9641ce924ed91ec8304577e463823a29ffaf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-98945 (GCVE-0-2026-98945)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:19 – Updated: 2026-10-26 06:56

Title

HID: steam: Rearrange teardown sequence

Summary

In the Linux kernel, the following vulnerability has been resolved: HID: steam: Rearrange teardown sequence This fixes a narrow window during the teardown sequence where callbacks could still be scheduled during cleanup that would then have a dangling pointer to the now-freed steam struct. This also puts work canceling for rumble and mode switch in steam_unregister, as that shouldn't persist while the client hdev is open.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7067 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/d2587923d50c8b141…
https://git.kernel.org/stable/c/81a8209c09f9be7ee…
https://git.kernel.org/stable/c/86724f4bcf6049c3a…
https://git.kernel.org/stable/c/b5ea938ff77630679…
https://git.kernel.org/stable/c/ddce9641ce924ed91…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9cd61c8179781344315c2a9816977ea415c5459e , < d2587923d50c8b141ce0ccb284c714cf6054d6a7 (git) Affected: 9cd61c8179781344315c2a9816977ea415c5459e , < 81a8209c09f9be7eef860ca6cc154749a6b4d243 (git) Affected: 9cd61c8179781344315c2a9816977ea415c5459e , < 86724f4bcf6049c3a322f7a7b1f968210059c46a (git) Affected: 9cd61c8179781344315c2a9816977ea415c5459e , < b5ea938ff776306798d3a11485c2475034f92131 (git) Affected: 9cd61c8179781344315c2a9816977ea415c5459e , < ddce9641ce924ed91ec8304577e463823a29ffaf (git)
Linux	Linux	Affected: 6.3 Unaffected: 0 , < 6.3 (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-steam.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d2587923d50c8b141ce0ccb284c714cf6054d6a7",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "versionType": "git"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.3",
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                },
                {
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "negate": false,
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: steam: Rearrange teardown sequence\n\nThis fixes a narrow window during the teardown sequence where callbacks\ncould still be scheduled during cleanup that would then have a dangling\npointer to the now-freed steam struct.\n\nThis also puts work canceling for rumble and mode switch in\nsteam_unregister, as that shouldn\u0027t persist while the client hdev is open."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - `uhid_char_write()` accepts `UHID_CREATE2` with `BUS_USB` and Valve 0x28de:0x1205, causing `hid_add_device()` to bind `steam_probe()` and create the FF input device. The local actor races `evdev_write(EV_FF)` with `UHID_DESTROY`, whose `uhid_dev_destroy()` path reaches the patched `steam_remove()`.\nAC:L - `steam_play_effect()` queues `coalesce_rumble_work` for HZ/20; repeated EV_FF writes can queue it after old `steam_remove()` cancels work but before `steam_input_unregister()` removes evdev. The attacker controls both EV_FF submission and UHID teardown, making the race repeatable.\nPR:L - `uhid_char_write()`, `uhid_dev_create2()`, and `evdev_write()` contain no capability or namespace-admin check; access is governed by device-node DAC. An ordinary logged-in user granted `/dev/uhid` and the created `/dev/input/event*` therefore needs only low privileges.\nUI:N - The attacking process creates the forged Steam Deck, uploads and plays rumble, and destroys its own UHID device; the delayed work then runs automatically. No victim must plug in hardware, open a file, or approve an action.\nS:U - `steam_remove()` releases the devm-allocated `struct steam_device`, and the stale work item subsequently accesses memory within the same host kernel. No VM, IOMMU, or other security-authority boundary is crossed.\nC:H - `steam_coalesce_rumble_cb()` reads freed `rumble_left/right`, then `steam_haptic_rumble()` follows the freed `steam-\u003ehdev` into HID report metadata. Reclaiming these slabs makes the UAF reads attacker-directed, supporting high confidentiality impact.\nI:H - `steam_coalesce_rumble_cb()` locks the freed `report_mutex`, can requeue the embedded freed work item, and `steam_send_report()` dispatches through `steam-\u003ehdev-\u003ell_driver-\u003eraw_request`. Controlled slab reuse therefore permits write and control-flow corruption.\nA:H - The delayed `steam_coalesce_rumble_cb()` or `steam_haptic_rumble_cb()` can run after devres frees `steam`, so its mutex, workqueue, and HID dereferences can oops or panic the kernel. The actor can recreate the UHID device and repeat the teardown."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-26T06:56:55.094Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/ddce9641ce924ed91ec8304577e463823a29ffaf"
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      "title": "HID: steam: Rearrange teardown sequence",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98945",
    "datePublished": "2026-10-23T12:19:04.191Z",
    "dateReserved": "2026-09-25T10:25:14.381Z",
    "dateUpdated": "2026-10-26T06:56:55.094Z",
    "state": "PUBLISHED"
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}

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.

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