{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46213", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.105Z", "datePublished": "2026-05-28T09:40:30.429Z", "dateUpdated": "2026-06-14T18:03:11.677Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-14T18:03:11.677Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: appletb-kbd: fix UAF in inactivity-timer cleanup path\n\nCommit 38224c472a03 (\"HID: appletb-kbd: fix slab use-after-free bug in\nappletb_kbd_probe\") added timer_delete_sync(&kbd->inactivity_timer) to\nboth the probe close_hw error path and appletb_kbd_remove(), but the\nway it was wired in left the inactivity timer reachable during driver\ntear-down via two distinct windows.\n\nWindow A -- put_device() before timer_delete_sync():\n\n\tput_device(&kbd->backlight_dev->dev);\n\ttimer_delete_sync(&kbd->inactivity_timer);\n\nThe inactivity_timer softirq reads kbd->backlight_dev and calls\nbacklight_device_set_brightness() -> mutex_lock(&ops_lock). If a\nconcurrent hid_appletb_bl unbind drops the last devm reference\nbetween these two calls, the backlight_device is freed and the\nmutex_lock() touches freed memory.\n\nWindow B -- backlight cleanup before hid_hw_stop():\n\n\tif (kbd->backlight_dev) {\n\t\ttimer_delete_sync(...);\n\t\tput_device(...);\n\t}\n\thid_hw_close(hdev);\n\thid_hw_stop(hdev);\n\nEven after Window A is closed, hid_hw_close()/hid_hw_stop() still run\nafterwards, so a late \".event\" callback from the HID core (USB URB\ncompletion on real Apple hardware) can arrive after\ntimer_delete_sync() drained the softirq but before put_device() drops\nthe reference. That callback reaches reset_inactivity_timer(), which\ncalls mod_timer() and re-arms the timer. The freshly re-armed timer\ncan then fire on the about-to-be-freed backlight_device.\n\nBoth windows produce the same KASAN slab-use-after-free:\n\n BUG: KASAN: slab-use-after-free in __mutex_lock+0x1aab/0x21c0\n Read of size 8 at addr ffff88803ee9a108 by task swapper/0/0\n Call Trace:\n \n __mutex_lock\n backlight_device_set_brightness\n appletb_inactivity_timer\n call_timer_fn\n run_timer_softirq\n handle_softirqs\n Allocated by task N:\n devm_backlight_device_register\n appletb_bl_probe\n Freed by task M:\n (concurrent hid_appletb_bl unbind path)\n\nClose both windows at once by reworking the tear-down in\nappletb_kbd_remove() and in the probe close_hw error path so that\n\n 1) hid_hw_close()/hid_hw_stop() run before the backlight cleanup,\n guaranteeing no further .event callback can fire and re-arm the\n timer, and\n 2) inside the \"if (kbd->backlight_dev)\" block, timer_delete_sync()\n runs before put_device(), so the softirq is drained before the\n final reference is dropped." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/hid/hid-appletb-kbd.c" ], "versions": [ { "version": "38224c472a038fa9ccd4085511dd9f3d6119dbf9", "lessThan": "59a79938ca5541fe55d675304116b7ea684afef0", "status": "affected", "versionType": "git" }, { "version": "38224c472a038fa9ccd4085511dd9f3d6119dbf9", "lessThan": "93d989e47bc316c793a69c6a332e053c90e29f02", "status": "affected", "versionType": "git" }, { "version": "38224c472a038fa9ccd4085511dd9f3d6119dbf9", "lessThan": "4db2af929279c799b5653a39eb0795c72baffca4", "status": "affected", "versionType": "git" }, { "version": "51720dee3a61ebace36c3dcdd0b4a488e0970f29", "status": "affected", "versionType": "git" }, { "version": "6.15.6", "lessThan": "6.16", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/hid/hid-appletb-kbd.c" ], "versions": [ { "version": "6.16", "status": "affected" }, { "version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.32", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.9", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "6.16", "versionEndExcluding": "6.18.32" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/59a79938ca5541fe55d675304116b7ea684afef0" }, { "url": "https://git.kernel.org/stable/c/93d989e47bc316c793a69c6a332e053c90e29f02" }, { "url": "https://git.kernel.org/stable/c/4db2af929279c799b5653a39eb0795c72baffca4" } ], "title": "HID: appletb-kbd: fix UAF in inactivity-timer cleanup path", "x_generator": { "engine": "bippy-1.2.0" } } } }