{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38378", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.010Z", "datePublished": "2025-07-25T12:53:20.144Z", "dateUpdated": "2026-05-11T21:26:49.888Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:26:49.888Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: appletb-kbd: fix slab use-after-free bug in appletb_kbd_probe\n\nIn probe appletb_kbd_probe() a \"struct appletb_kbd *kbd\" is allocated\nvia devm_kzalloc() to store touch bar keyboard related data.\nLater on if backlight_device_get_by_name() finds a backlight device\nwith name \"appletb_backlight\" a timer (kbd->inactivity_timer) is setup\nwith appletb_inactivity_timer() and the timer is armed to run after\nappletb_tb_dim_timeout (60) seconds.\n\nA use-after-free is triggered when failure occurs after the timer is\narmed. This ultimately means probe failure occurs and as a result the\n\"struct appletb_kbd *kbd\" which is device managed memory is freed.\nAfter 60 seconds the timer will have expired and __run_timers will\nattempt to access the timer (kbd->inactivity_timer) however the kdb\nstructure has been freed causing a use-after free.\n\n[ 71.636938] ==================================================================\n[ 71.637915] BUG: KASAN: slab-use-after-free in __run_timers+0x7ad/0x890\n[ 71.637915] Write of size 8 at addr ffff8881178c5958 by task swapper/1/0\n[ 71.637915]\n[ 71.637915] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.16.0-rc2-00318-g739a6c93cc75-dirty #12 PREEMPT(voluntary)\n[ 71.637915] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\n[ 71.637915] Call Trace:\n[ 71.637915] \n[ 71.637915] dump_stack_lvl+0x53/0x70\n[ 71.637915] print_report+0xce/0x670\n[ 71.637915] ? __run_timers+0x7ad/0x890\n[ 71.637915] kasan_report+0xce/0x100\n[ 71.637915] ? __run_timers+0x7ad/0x890\n[ 71.637915] __run_timers+0x7ad/0x890\n[ 71.637915] ? __pfx___run_timers+0x10/0x10\n[ 71.637915] ? update_process_times+0xfc/0x190\n[ 71.637915] ? __pfx_update_process_times+0x10/0x10\n[ 71.637915] ? _raw_spin_lock_irq+0x80/0xe0\n[ 71.637915] ? _raw_spin_lock_irq+0x80/0xe0\n[ 71.637915] ? __pfx__raw_spin_lock_irq+0x10/0x10\n[ 71.637915] run_timer_softirq+0x141/0x240\n[ 71.637915] ? __pfx_run_timer_softirq+0x10/0x10\n[ 71.637915] ? __pfx___hrtimer_run_queues+0x10/0x10\n[ 71.637915] ? kvm_clock_get_cycles+0x18/0x30\n[ 71.637915] ? ktime_get+0x60/0x140\n[ 71.637915] handle_softirqs+0x1b8/0x5c0\n[ 71.637915] ? __pfx_handle_softirqs+0x10/0x10\n[ 71.637915] irq_exit_rcu+0xaf/0xe0\n[ 71.637915] sysvec_apic_timer_interrupt+0x6c/0x80\n[ 71.637915] \n[ 71.637915]\n[ 71.637915] Allocated by task 39:\n[ 71.637915] kasan_save_stack+0x33/0x60\n[ 71.637915] kasan_save_track+0x14/0x30\n[ 71.637915] __kasan_kmalloc+0x8f/0xa0\n[ 71.637915] __kmalloc_node_track_caller_noprof+0x195/0x420\n[ 71.637915] devm_kmalloc+0x74/0x1e0\n[ 71.637915] appletb_kbd_probe+0x37/0x3c0\n[ 71.637915] hid_device_probe+0x2d1/0x680\n[ 71.637915] really_probe+0x1c3/0x690\n[ 71.637915] __driver_probe_device+0x247/0x300\n[ 71.637915] driver_probe_device+0x49/0x210\n[...]\n[ 71.637915]\n[ 71.637915] Freed by task 39:\n[ 71.637915] kasan_save_stack+0x33/0x60\n[ 71.637915] kasan_save_track+0x14/0x30\n[ 71.637915] kasan_save_free_info+0x3b/0x60\n[ 71.637915] __kasan_slab_free+0x37/0x50\n[ 71.637915] kfree+0xcf/0x360\n[ 71.637915] devres_release_group+0x1f8/0x3c0\n[ 71.637915] hid_device_probe+0x315/0x680\n[ 71.637915] really_probe+0x1c3/0x690\n[ 71.637915] __driver_probe_device+0x247/0x300\n[ 71.637915] driver_probe_device+0x49/0x210\n[...]\n\nThe root cause of the issue is that the timer is not disarmed\non failure paths leading to it remaining active and accessing\nfreed memory. To fix this call timer_delete_sync() to deactivate\nthe timer.\n\nAnother small issue is that timer_delete_sync is called\nunconditionally in appletb_kbd_remove(), fix this by checking\nfor a valid kbd->backlight_dev before calling timer_delete_sync." } ], "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": "93a0fc48948107e0cc34e1de22c3cb363a8f2783", "lessThan": "51720dee3a61ebace36c3dcdd0b4a488e0970f29", "status": "affected", "versionType": "git" }, { "version": "93a0fc48948107e0cc34e1de22c3cb363a8f2783", "lessThan": "38224c472a038fa9ccd4085511dd9f3d6119dbf9", "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-appletb-kbd.c" ], "versions": [ { "version": "6.15", "status": "affected" }, { "version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.6", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "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": "6.15", "versionEndExcluding": "6.15.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/51720dee3a61ebace36c3dcdd0b4a488e0970f29" }, { "url": "https://git.kernel.org/stable/c/38224c472a038fa9ccd4085511dd9f3d6119dbf9" } ], "title": "HID: appletb-kbd: fix slab use-after-free bug in appletb_kbd_probe", "x_generator": { "engine": "bippy-1.2.0" } } } }