HID: appletb-kbd: run inactivity autodim from workqueues

{
  "id": "78cdcdacbce5ec25e33cd695a9f587b78d2845db1f29d723fd7808f15c32df43",
  "url": "https://osv.dev/vulnerability/CVE-2026-46202",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HID: appletb-kbd: run inactivity autodim from workqueues",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: HID: appletb-kbd: run inactivity autodim from workqueues The autodim code in hid-appletb-kbd takes backlight_device->ops_lock via backlight_device_set_brightness() -> mutex_lock() from two different atomic contexts: * appletb_inactivity_timer() is a struct timer_list callback, so it runs in softirq context. Every expiry triggers BUG: sleeping function called from invalid context at kernel/locking/mutex.c:591 Call Trace: __might_resched __mutex_lock backlight_device_set_brightness appletb_inactivity_timer call_timer_fn run_timer_softirq * reset_inactivity_timer() is called from appletb_kbd_hid_event() and appletb_kbd_inp_event(). On real USB hardware these run in softirq/IRQ context (URB completion and input-event dispatch). When the Touch Bar has already been dimmed or turned off, the reset path calls backlight_device_set_brightness() directly to restore brightness, producing the same warning. Both call sites hit the same mutex_lock()-from-atomic bug. Fix them together by moving the blocking work onto the system workqueue: * Convert the inactivity timer from struct timer_list to struct delayed_work; the callback (appletb_inactivity_work) now runs in process context where mutex_lock() is legal. * Add a dedicated struct work_struct restore_brightness_work and have reset_inactivity_timer() schedule it instead of calling backlight_device_set_brightness() directly. Cancel both works synchronously during driver tea",
    "evidence": "osv:CVE-2026-46202",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.32",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-46202",
      "aliases": [
        "CVE-2026-46202"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "93a0fc48948107e0cc34e1de22c3cb363a8f2783"
                },
                {
                  "fixed": "5c0830323689ef15224f0025276176988861b3b0"
                },
                {
                  "fixed": "2473a334c292af257ef68e33bc7760f4a8251812"
                },
                {
                  "fixed": "1654e53349d4e657b331de354313461f401f5063"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46202.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.15.0"
                },
                {
                  "fixed": "6.18.32"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46202.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.623414237Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1654e53349d4e657b331de354313461f401f5063",
        "https://git.kernel.org/stable/c/2473a334c292af257ef68e33bc7760f4a8251812",
        "https://git.kernel.org/stable/c/5c0830323689ef15224f0025276176988861b3b0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46202.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-46202",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46202.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-46202",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 499316,
  "published_at": "2026-05-28T09:40:18.687+00:00"
}