{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98945", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.381Z", "datePublished": "2026-10-23T12:19:04.191Z", "dateUpdated": "2026-10-26T06:56:55.094Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-26T06:56:55.094Z" }, "descriptions": [ { "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't persist while the client hdev is open." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "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->hdev` 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->hdev->ll_driver->raw_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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/hid/hid-steam.c" ], "versions": [ { "version": "9cd61c8179781344315c2a9816977ea415c5459e", "lessThan": "d2587923d50c8b141ce0ccb284c714cf6054d6a7", "status": "affected", "versionType": "git" }, { "version": "9cd61c8179781344315c2a9816977ea415c5459e", "lessThan": "81a8209c09f9be7eef860ca6cc154749a6b4d243", "status": "affected", "versionType": "git" }, { "version": "9cd61c8179781344315c2a9816977ea415c5459e", "lessThan": "86724f4bcf6049c3a322f7a7b1f968210059c46a", "status": "affected", "versionType": "git" }, { "version": "9cd61c8179781344315c2a9816977ea415c5459e", "lessThan": "b5ea938ff776306798d3a11485c2475034f92131", "status": "affected", "versionType": "git" }, { "version": "9cd61c8179781344315c2a9816977ea415c5459e", "lessThan": "ddce9641ce924ed91ec8304577e463823a29ffaf", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/hid/hid-steam.c" ], "versions": [ { "version": "6.3", "status": "affected" }, { "version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.11", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.12.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.18.57" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.2.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d2587923d50c8b141ce0ccb284c714cf6054d6a7" }, { "url": "https://git.kernel.org/stable/c/81a8209c09f9be7eef860ca6cc154749a6b4d243" }, { "url": "https://git.kernel.org/stable/c/86724f4bcf6049c3a322f7a7b1f968210059c46a" }, { "url": "https://git.kernel.org/stable/c/b5ea938ff776306798d3a11485c2475034f92131" }, { "url": "https://git.kernel.org/stable/c/ddce9641ce924ed91ec8304577e463823a29ffaf" } ], "title": "HID: steam: Rearrange teardown sequence", "x_generator": { "engine": "bippy-1.2.0" } } } }