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