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

Vulnerability from cvelistv5 – Published: 2026-10-23 12:19 – Updated: 2026-10-26 06:56
VLAI
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
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9cd61c8179781344315c2a9816977ea415c5459e , < d2587923d50c8b141ce0ccb284c714cf6054d6a7 (git)
Affected: 9cd61c8179781344315c2a9816977ea415c5459e , < 81a8209c09f9be7eef860ca6cc154749a6b4d243 (git)
Affected: 9cd61c8179781344315c2a9816977ea415c5459e , < 86724f4bcf6049c3a322f7a7b1f968210059c46a (git)
Affected: 9cd61c8179781344315c2a9816977ea415c5459e , < b5ea938ff776306798d3a11485c2475034f92131 (git)
Affected: 9cd61c8179781344315c2a9816977ea415c5459e , < ddce9641ce924ed91ec8304577e463823a29ffaf (git)
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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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{
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          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-steam.c"
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        {
          "lang": "en",
          "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": [
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            "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/d2587923d50c8b141ce0ccb284c714cf6054d6a7"
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          "url": "https://git.kernel.org/stable/c/81a8209c09f9be7eef860ca6cc154749a6b4d243"
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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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      "id": "msrc_CVE-2026-98945",
      "initial_release_date": "2026-10-24T01:09:07.000Z",
      "product_status:under_investigation": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "HID: steam: Rearrange teardown sequence",
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          }
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        "lastModified": "2026-10-26T07:17:18.260",
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                "confidentialityImpact": "HIGH",
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}



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