{"id":"DEBIAN-CVE-2026-46213","details":"In the Linux kernel, the following vulnerability has been resolved:  HID: appletb-kbd: fix UAF in inactivity-timer cleanup path  Commit 38224c472a03 (\"HID: appletb-kbd: fix slab use-after-free bug in appletb_kbd_probe\") added timer_delete_sync(&kbd-\u003einactivity_timer) to both the probe close_hw error path and appletb_kbd_remove(), but the way it was wired in left the inactivity timer reachable during driver tear-down via two distinct windows.  Window A -- put_device() before timer_delete_sync():  \tput_device(&kbd-\u003ebacklight_dev-\u003edev); \ttimer_delete_sync(&kbd-\u003einactivity_timer);  The inactivity_timer softirq reads kbd-\u003ebacklight_dev and calls backlight_device_set_brightness() -\u003e mutex_lock(&ops_lock).  If a concurrent hid_appletb_bl unbind drops the last devm reference between these two calls, the backlight_device is freed and the mutex_lock() touches freed memory.  Window B -- backlight cleanup before hid_hw_stop():  \tif (kbd-\u003ebacklight_dev) { \t\ttimer_delete_sync(...); \t\tput_device(...); \t} \thid_hw_close(hdev); \thid_hw_stop(hdev);  Even after Window A is closed, hid_hw_close()/hid_hw_stop() still run afterwards, so a late \".event\" callback from the HID core (USB URB completion on real Apple hardware) can arrive after timer_delete_sync() drained the softirq but before put_device() drops the reference.  That callback reaches reset_inactivity_timer(), which calls mod_timer() and re-arms the timer.  The freshly re-armed timer can then fire on the about-to-be-freed backlight_device.  Both windows produce the same KASAN slab-use-after-free:    BUG: KASAN: slab-use-after-free in __mutex_lock+0x1aab/0x21c0   Read of size 8 at addr ffff88803ee9a108 by task swapper/0/0   Call Trace:    \u003cIRQ\u003e    __mutex_lock    backlight_device_set_brightness    appletb_inactivity_timer    call_timer_fn    run_timer_softirq    handle_softirqs   Allocated by task N:    devm_backlight_device_register    appletb_bl_probe   Freed by task M:    (concurrent hid_appletb_bl unbind path)  Close both windows at once by reworking the tear-down in appletb_kbd_remove() and in the probe close_hw error path so that   1) hid_hw_close()/hid_hw_stop() run before the backlight cleanup,     guaranteeing no further .event callback can fire and re-arm the     timer, and  2) inside the \"if (kbd-\u003ebacklight_dev)\" block, timer_delete_sync()     runs before put_device(), so the softirq is drained before the     final reference is dropped.","modified":"2026-09-14T17:03:41.353098650Z","published":"2026-05-28T10:16:36.947Z","upstream":["CVE-2026-46213"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-46213"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.0.9-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.10-1","6.18.12-1","6.18.12-1~bpo13+1","6.18.13-1","6.18.14-1","6.18.15-1","6.18.15-1~bpo13+1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18.8-1","6.18.9-1","6.18.9-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1","6.19-1~exp1","6.19.10-1","6.19.10-1~bpo13+1","6.19.11-1","6.19.11-1~bpo13+1","6.19.12-1","6.19.13-1","6.19.13-1~bpo13+1","6.19.14-1","6.19.14-1~bpo13+1","6.19.2-1~exp1","6.19.3-1~exp1","6.19.4-1~exp1","6.19.5-1~exp1","6.19.6-1","6.19.6-2","6.19.6-2~bpo13+1","6.19.8-1","6.19.8-1~bpo13+1","6.19~rc4-1~exp1","6.19~rc5-1~exp1","6.19~rc6-1~exp1","6.19~rc7-1~exp1","6.19~rc8-1~exp1","7.0-1~exp1","7.0.1-1~exp1","7.0.3-1","7.0.4-1","7.0.4-1~bpo13+1","7.0.7-1","7.0.7-1~bpo13+1","7.0.9-1~bpo13+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-46213.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}