{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38394","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T04:51:24.011Z","datePublished":"2025-07-25T12:53:39.017Z","dateUpdated":"2026-05-11T21:27:08.142Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:27:08.142Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: appletb-kbd: fix memory corruption of input_handler_list\n\nIn appletb_kbd_probe an input handler is initialised and then registered\nwith input core through input_register_handler(). When this happens input\ncore will add the input handler (specifically its node) to the global\ninput_handler_list. The input_handler_list is central to the functionality\nof input core and is traversed in various places in input core. An example\nof this is when a new input device is plugged in and gets registered with\ninput core.\n\nThe input_handler in probe is allocated as device managed memory. If a\nprobe failure occurs after input_register_handler() the input_handler\nmemory is freed, yet it will remain in the input_handler_list. This\neffectively means the input_handler_list contains a dangling pointer\nto data belonging to a freed input handler.\n\nThis causes an issue when any other input device is plugged in - in my\ncase I had an old PixArt HP USB optical mouse and I decided to\nplug it in after a failure occurred after input_register_handler().\nThis lead to the registration of this input device via\ninput_register_device which involves traversing over every handler\nin the corrupted input_handler_list and calling input_attach_handler(),\ngiving each handler a chance to bind to newly registered device.\n\nThe core of this bug is a UAF which causes memory corruption of\ninput_handler_list and to fix it we must ensure the input handler is\nunregistered from input core, this is done through\ninput_unregister_handler().\n\n[ 63.191597] ==================================================================\n[ 63.192094] BUG: KASAN: slab-use-after-free in input_attach_handler.isra.0+0x1a9/0x1e0\n[ 63.192094] Read of size 8 at addr ffff888105ea7c80 by task kworker/0:2/54\n[ 63.192094]\n[ 63.192094] CPU: 0 UID: 0 PID: 54 Comm: kworker/0:2 Not tainted 6.16.0-rc2-00321-g2aa6621d\n[ 63.192094] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.164\n[ 63.192094] Workqueue: usb_hub_wq hub_event\n[ 63.192094] Call Trace:\n[ 63.192094] \n[ 63.192094] dump_stack_lvl+0x53/0x70\n[ 63.192094] print_report+0xce/0x670\n[ 63.192094] kasan_report+0xce/0x100\n[ 63.192094] input_attach_handler.isra.0+0x1a9/0x1e0\n[ 63.192094] input_register_device+0x76c/0xd00\n[ 63.192094] hidinput_connect+0x686d/0xad60\n[ 63.192094] hid_connect+0xf20/0x1b10\n[ 63.192094] hid_hw_start+0x83/0x100\n[ 63.192094] hid_device_probe+0x2d1/0x680\n[ 63.192094] really_probe+0x1c3/0x690\n[ 63.192094] __driver_probe_device+0x247/0x300\n[ 63.192094] driver_probe_device+0x49/0x210\n[ 63.192094] __device_attach_driver+0x160/0x320\n[ 63.192094] bus_for_each_drv+0x10f/0x190\n[ 63.192094] __device_attach+0x18e/0x370\n[ 63.192094] bus_probe_device+0x123/0x170\n[ 63.192094] device_add+0xd4d/0x1460\n[ 63.192094] hid_add_device+0x30b/0x910\n[ 63.192094] usbhid_probe+0x920/0xe00\n[ 63.192094] usb_probe_interface+0x363/0x9a0\n[ 63.192094] really_probe+0x1c3/0x690\n[ 63.192094] __driver_probe_device+0x247/0x300\n[ 63.192094] driver_probe_device+0x49/0x210\n[ 63.192094] __device_attach_driver+0x160/0x320\n[ 63.192094] bus_for_each_drv+0x10f/0x190\n[ 63.192094] __device_attach+0x18e/0x370\n[ 63.192094] bus_probe_device+0x123/0x170\n[ 63.192094] device_add+0xd4d/0x1460\n[ 63.192094] usb_set_configuration+0xd14/0x1880\n[ 63.192094] usb_generic_driver_probe+0x78/0xb0\n[ 63.192094] usb_probe_device+0xaa/0x2e0\n[ 63.192094] really_probe+0x1c3/0x690\n[ 63.192094] __driver_probe_device+0x247/0x300\n[ 63.192094] driver_probe_device+0x49/0x210\n[ 63.192094] __device_attach_driver+0x160/0x320\n[ 63.192094] bus_for_each_drv+0x10f/0x190\n[ 63.192094] __device_attach+0x18e/0x370\n[ 63.192094] bus_probe_device+0x123/0x170\n[ 63.192094] device_add+0xd4d/0x1460\n[ 63.192094] usb_new_device+0x7b4/0x1000\n[ 63.192094] hub_event+0x234d/0x3\n---truncated---"}],"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":"7d62ba8deacf94f546a0b9dd9bc86617343187a3","lessThan":"6ad40b07e15c29712d9a4b8096914ccd82e3fc17","status":"affected","versionType":"git"},{"version":"7d62ba8deacf94f546a0b9dd9bc86617343187a3","lessThan":"c80f2b047d5cc42fbd2dff9d1942d4ba7545100f","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/6ad40b07e15c29712d9a4b8096914ccd82e3fc17"},{"url":"https://git.kernel.org/stable/c/c80f2b047d5cc42fbd2dff9d1942d4ba7545100f"}],"title":"HID: appletb-kbd: fix memory corruption of input_handler_list","x_generator":{"engine":"bippy-1.2.0"}}}}