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CVE-2025-21948 (GCVE-0-2025-21948)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:41 – Updated: 2026-05-11 21:09
VLAI
Title
HID: appleir: Fix potential NULL dereference at raw event handle
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: appleir: Fix potential NULL dereference at raw event handle Syzkaller reports a NULL pointer dereference issue in input_event(). BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: null-ptr-deref in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: null-ptr-deref in is_event_supported drivers/input/input.c:67 [inline] BUG: KASAN: null-ptr-deref in input_event+0x42/0xa0 drivers/input/input.c:395 Read of size 8 at addr 0000000000000028 by task syz-executor199/2949 CPU: 0 UID: 0 PID: 2949 Comm: syz-executor199 Not tainted 6.13.0-rc4-syzkaller-00076-gf097a36ef88d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 kasan_report+0xd9/0x110 mm/kasan/report.c:602 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] is_event_supported drivers/input/input.c:67 [inline] input_event+0x42/0xa0 drivers/input/input.c:395 input_report_key include/linux/input.h:439 [inline] key_down drivers/hid/hid-appleir.c:159 [inline] appleir_raw_event+0x3e5/0x5e0 drivers/hid/hid-appleir.c:232 __hid_input_report.constprop.0+0x312/0x440 drivers/hid/hid-core.c:2111 hid_ctrl+0x49f/0x550 drivers/hid/usbhid/hid-core.c:484 __usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734 dummy_timer+0x17f7/0x3960 drivers/usb/gadget/udc/dummy_hcd.c:1993 __run_hrtimer kernel/time/hrtimer.c:1739 [inline] __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1803 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1820 handle_softirqs+0x206/0x8d0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 __mod_timer+0x8f6/0xdc0 kernel/time/timer.c:1185 add_timer+0x62/0x90 kernel/time/timer.c:1295 schedule_timeout+0x11f/0x280 kernel/time/sleep_timeout.c:98 usbhid_wait_io+0x1c7/0x380 drivers/hid/usbhid/hid-core.c:645 usbhid_init_reports+0x19f/0x390 drivers/hid/usbhid/hid-core.c:784 hiddev_ioctl+0x1133/0x15b0 drivers/hid/usbhid/hiddev.c:794 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> This happens due to the malformed report items sent by the emulated device which results in a report, that has no fields, being added to the report list. Due to this appleir_input_configured() is never called, hidinput_connect() fails which results in the HID_CLAIMED_INPUT flag is not being set. However, it does not make appleir_probe() fail and lets the event callback to be called without the associated input device. Thus, add a check for the HID_CLAIMED_INPUT flag and leave the event hook early if the driver didn't claim any input_dev for some reason. Moreover, some other hid drivers accessing input_dev in their event callbacks do have similar checks, too. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 17:17 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < 6db423b00940b05df2a1265d3c7eabafe9f1734c (git)
Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < 0df1ac8ee417ad76760ff076faa4518a4d861894 (git)
Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < b1d95d733cd6e74f595653daddcfc357bea461e8 (git)
Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < 8d39eb8c5e14f2f0f441eed832ef8a7b654e6fee (git)
Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < fc69e2c3219d433caabba4b5d6371ba726a4b37f (git)
Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < d335fce8b88b2353f4bb20c631698e20384e3610 (git)
Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < 68cdf6710f228dfd74f66ec61fbe636da2646a73 (git)
Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < 2ff5baa9b5275e3acafdf7f2089f74cccb2f38d1 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.131 , ≤ 6.1.* (semver)
Unaffected: 6.6.83 , ≤ 6.6.* (semver)
Unaffected: 6.12.19 , ≤ 6.12.* (semver)
Unaffected: 6.13.7 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: appleir: Fix potential NULL dereference at raw event handle\n\nSyzkaller reports a NULL pointer dereference issue in input_event().\n\nBUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline]\nBUG: KASAN: null-ptr-deref in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]\nBUG: KASAN: null-ptr-deref in is_event_supported drivers/input/input.c:67 [inline]\nBUG: KASAN: null-ptr-deref in input_event+0x42/0xa0 drivers/input/input.c:395\nRead of size 8 at addr 0000000000000028 by task syz-executor199/2949\n\nCPU: 0 UID: 0 PID: 2949 Comm: syz-executor199 Not tainted 6.13.0-rc4-syzkaller-00076-gf097a36ef88d #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\nCall Trace:\n \u003cIRQ\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n kasan_report+0xd9/0x110 mm/kasan/report.c:602\n check_region_inline mm/kasan/generic.c:183 [inline]\n kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189\n instrument_atomic_read include/linux/instrumented.h:68 [inline]\n _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]\n is_event_supported drivers/input/input.c:67 [inline]\n input_event+0x42/0xa0 drivers/input/input.c:395\n input_report_key include/linux/input.h:439 [inline]\n key_down drivers/hid/hid-appleir.c:159 [inline]\n appleir_raw_event+0x3e5/0x5e0 drivers/hid/hid-appleir.c:232\n __hid_input_report.constprop.0+0x312/0x440 drivers/hid/hid-core.c:2111\n hid_ctrl+0x49f/0x550 drivers/hid/usbhid/hid-core.c:484\n __usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650\n usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734\n dummy_timer+0x17f7/0x3960 drivers/usb/gadget/udc/dummy_hcd.c:1993\n __run_hrtimer kernel/time/hrtimer.c:1739 [inline]\n __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1803\n hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1820\n handle_softirqs+0x206/0x8d0 kernel/softirq.c:561\n __do_softirq kernel/softirq.c:595 [inline]\n invoke_softirq kernel/softirq.c:435 [inline]\n __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:662\n irq_exit_rcu+0x9/0x30 kernel/softirq.c:678\n instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]\n sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049\n \u003c/IRQ\u003e\n \u003cTASK\u003e\n asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702\n __mod_timer+0x8f6/0xdc0 kernel/time/timer.c:1185\n add_timer+0x62/0x90 kernel/time/timer.c:1295\n schedule_timeout+0x11f/0x280 kernel/time/sleep_timeout.c:98\n usbhid_wait_io+0x1c7/0x380 drivers/hid/usbhid/hid-core.c:645\n usbhid_init_reports+0x19f/0x390 drivers/hid/usbhid/hid-core.c:784\n hiddev_ioctl+0x1133/0x15b0 drivers/hid/usbhid/hiddev.c:794\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl fs/ioctl.c:892 [inline]\n __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \u003c/TASK\u003e\n\nThis happens due to the malformed report items sent by the emulated device\nwhich results in a report, that has no fields, being added to the report list.\nDue to this appleir_input_configured() is never called, hidinput_connect()\nfails which results in the HID_CLAIMED_INPUT flag is not being set. However,\nit  does not make appleir_probe() fail and lets the event callback to be\ncalled without the associated input device.\n\nThus, add a check for the HID_CLAIMED_INPUT flag and leave the event hook\nearly if the driver didn\u0027t claim any input_dev for some reason. Moreover,\nsome other hid drivers accessing input_dev in their event callbacks do have\nsimilar checks, too.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."
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          "url": "https://git.kernel.org/stable/c/0df1ac8ee417ad76760ff076faa4518a4d861894"
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      "date": "2026-09-19",
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      "cve": "CVE-2025-21948",
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      "source": "Microsoft CSAF VEX",
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      "title": "HID: appleir: Fix potential NULL dereference at raw event handle",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: appleir: Fix potential NULL dereference at raw event handle\n\nSyzkaller reports a NULL pointer dereference issue in input_event().\n\nBUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline]\nBUG: KASAN: null-ptr-deref in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]\nBUG: KASAN: null-ptr-deref in is_event_supported drivers/input/input.c:67 [inline]\nBUG: KASAN: null-ptr-deref in input_event+0x42/0xa0 drivers/input/input.c:395\nRead of size 8 at addr 0000000000000028 by task syz-executor199/2949\n\nCPU: 0 UID: 0 PID: 2949 Comm: syz-executor199 Not tainted 6.13.0-rc4-syzkaller-00076-gf097a36ef88d #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\nCall Trace:\n \u003cIRQ\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n kasan_report+0xd9/0x110 mm/kasan/report.c:602\n check_region_inline mm/kasan/generic.c:183 [inline]\n kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189\n instrument_atomic_read include/linux/instrumented.h:68 [inline]\n _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]\n is_event_supported drivers/input/input.c:67 [inline]\n input_event+0x42/0xa0 drivers/input/input.c:395\n input_report_key include/linux/input.h:439 [inline]\n key_down drivers/hid/hid-appleir.c:159 [inline]\n appleir_raw_event+0x3e5/0x5e0 drivers/hid/hid-appleir.c:232\n __hid_input_report.constprop.0+0x312/0x440 drivers/hid/hid-core.c:2111\n hid_ctrl+0x49f/0x550 drivers/hid/usbhid/hid-core.c:484\n __usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650\n usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734\n dummy_timer+0x17f7/0x3960 drivers/usb/gadget/udc/dummy_hcd.c:1993\n __run_hrtimer kernel/time/hrtimer.c:1739 [inline]\n __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1803\n hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1820\n handle_softirqs+0x206/0x8d0 kernel/softirq.c:561\n __do_softirq kernel/softirq.c:595 [inline]\n invoke_softirq kernel/softirq.c:435 [inline]\n __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:662\n irq_exit_rcu+0x9/0x30 kernel/softirq.c:678\n instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]\n sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049\n \u003c/IRQ\u003e\n \u003cTASK\u003e\n asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702\n __mod_timer+0x8f6/0xdc0 kernel/time/timer.c:1185\n add_timer+0x62/0x90 kernel/time/timer.c:1295\n schedule_timeout+0x11f/0x280 kernel/time/sleep_timeout.c:98\n usbhid_wait_io+0x1c7/0x380 drivers/hid/usbhid/hid-core.c:645\n usbhid_init_reports+0x19f/0x390 drivers/hid/usbhid/hid-core.c:784\n hiddev_ioctl+0x1133/0x15b0 drivers/hid/usbhid/hiddev.c:794\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl fs/ioctl.c:892 [inline]\n __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \u003c/TASK\u003e\n\nThis happens due to the malformed report items sent by the emulated device\nwhich results in a report, that has no fields, being added to the report list.\nDue to this appleir_input_configured() is never called, hidinput_connect()\nfails which results in the HID_CLAIMED_INPUT flag is not being set. However,\nit  does not make appleir_probe() fail and lets the event callback to be\ncalled without the associated input device.\n\nThus, add a check for the HID_CLAIMED_INPUT flag and leave the event hook\nearly if the driver didn\u0027t claim any input_dev for some reason. Moreover,\nsome other hid drivers accessing input_dev in their event callbacks do have\nsimilar checks, too.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: HID: appleir: Se corrige una posible desreferencia de puntero NULL en el identificador de evento sin procesar Syzkaller informa un problema de desreferencia de puntero NULL en input_event(). ERROR: KASAN: null-ptr-deref en instrument_atomic_read include/linux/instrumented.h:68 [en l\u00ednea] ERROR: KASAN: null-ptr-deref en _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [en l\u00ednea] ERROR: KASAN: null-ptr-deref en is_event_supported drivers/input/input.c:67 [en l\u00ednea] ERROR: KASAN: null-ptr-deref en input_event+0x42/0xa0 drivers/input/input.c:395 Lectura de tama\u00f1o 8 en la direcci\u00f3n 0000000000000028 por la tarea syz-executor199/2949 CPU: 0 UID: 0 PID: 2949 Comm: syz-executor199 No contaminado 6.13.0-rc4-syzkaller-00076-gf097a36ef88d #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 13/09/2024 Rastreo de llamadas:  __dump_stack lib/dump_stack.c:94 [en l\u00ednea] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 kasan_report+0xd9/0x110 mm/kasan/report.c:602 check_region_inline mm/kasan/generic.c:183 [en l\u00ednea] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:68 [en l\u00ednea] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [en l\u00ednea] es_evento_compatible drivers/input/input.c:67 [en l\u00ednea] evento_entrada+0x42/0xa0 drivers/input/input.c:395 clave_informe_entrada include/linux/input.h:439 [en l\u00ednea] tecla_abajo drivers/hid/hid-appleir.c:159 [en l\u00ednea] evento_sin_usar_appleir+0x3e5/0x5e0 drivers/hid/hid-appleir.c:232 __hid_input_report.constprop.0+0x312/0x440 drivers/hid/hid-core.c:2111 hid_ctrl+0x49f/0x550 drivers/hid/usbhid/hid-core.c:484 __usb_hcd_giveback_urb+0x389/0x6e0 controladores/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x396/0x450 controladores/usb/core/hcd.c:1734 temporizador ficticio+0x17f7/0x3960 controladores/usb/gadget/udc/dummy_hcd.c:1993 __run_hrtimer kernel/time/hrtimer.c:1739 [en l\u00ednea] __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1803 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1820 handle_softirqs+0x206/0x8d0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [en l\u00ednea] invocar_softirq kernel/softirq.c:435 [en l\u00ednea] __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [en l\u00ednea] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049   asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 __mod_timer+0x8f6/0xdc0 kernel/time/timer.c:1185 add_timer+0x62/0x90 kernel/time/timer.c:1295 schedule_timeout+0x11f/0x280 kernel/time/sleep_timeout.c:98 usbhid_wait_io+0x1c7/0x380 drivers/hid/usbhid/hid-core.c:645 usbhid_init_reports+0x19f/0x390 drivers/hid/usbhid/hid-core.c:784 hiddev_ioctl+0x1133/0x15b0 drivers/hid/usbhid/hiddev.c:794 vfs_ioctl fs/ioctl.c:51 [en l\u00ednea] Esto sucede debido a los elementos de informe mal formados enviados por el dispositivo emulado, lo que da como resultado que se agregue a la lista de informes un informe que no tiene campos. Debido a que appleir_input_configured() nunca se llama, hidinput_connect() falla, lo que provoca que no se configure el indicador HID_CLAIMED_INPUT. Sin embargo, esto no provoca el fallo de appleir_probe() y permite que la devoluci\u00f3n de llamada del evento se llame sin el dispositivo de entrada asociado. Por lo tanto, se debe a\u00f1adir una comprobaci\u00f3n para el indicador HID_CLAIMED_INPUT y abandonar el gancho de evento antes de tiempo si el controlador no solicit\u00f3 ning\u00fan input_dev por alguna raz\u00f3n. Adem\u00e1s, otros controladores HID que acceden a input_dev en sus devoluciones de llamada de evento tambi\u00e9n tienen comprobaciones similares. Encontrado por el Centro de Verificaci\u00f3n de Linux (linuxtesting.org) con Syzkaller."
          }
        ],
        "id": "CVE-2025-21948",
        "lastModified": "2026-06-17T08:44:41.057",
        "metrics": {
          "cvssMetricV31": [
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              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
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              "exploitabilityScore": 1.8,
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              "source": "nvd@nist.gov",
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                "integrityImpact": "NONE",
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                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T17:17:14.096468Z",
                "version": "2.0.3"
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            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
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    "redhat_vex": {
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      "current_release_date": "2026-06-30T00:07:15+00:00",
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      "id": "CVE-2025-21948",
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      "product_status:known_affected": "260",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: HID: appleir: Fix potential NULL dereference at raw event handle",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21948.json",
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      "current_release_date": "2026-08-29T01:26:15Z",
      "cve": "CVE-2025-21948",
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      "product_status:recommended": "424",
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      "title": "SUSE CVE CVE-2025-21948",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21948.json",
      "version": "47"
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    "vulnrichment": {
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              {
                "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
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            ],
            "title": "CVE Program Container"
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            "metrics": [
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                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "NONE",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
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              },
              {
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                    "options": [
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                      },
                      {
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                      {
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                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-10-01T17:17:14.096468Z",
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            ],
            "problemTypes": [
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                  {
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                    "description": "CWE-476 NULL Pointer Dereference",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "product": "Linux",
              "programFiles": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "status": "affected",
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              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/hid/hid-appleir.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "3.10"
                },
                {
                  "lessThan": "3.10",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
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                  "status": "unaffected",
                  "version": "5.4.291",
                  "versionType": "semver"
                },
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                  "version": "5.10.235",
                  "versionType": "semver"
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                {
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                  "version": "5.15.179",
                  "versionType": "semver"
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                  "version": "6.1.131",
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                  "status": "unaffected",
                  "version": "6.6.83",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.19",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.13.*",
                  "status": "unaffected",
                  "version": "6.13.7",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.14",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
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                      "vulnerable": true
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                    {
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.19",
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          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: appleir: Fix potential NULL dereference at raw event handle\n\nSyzkaller reports a NULL pointer dereference issue in input_event().\n\nBUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline]\nBUG: KASAN: null-ptr-deref in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]\nBUG: KASAN: null-ptr-deref in is_event_supported drivers/input/input.c:67 [inline]\nBUG: KASAN: null-ptr-deref in input_event+0x42/0xa0 drivers/input/input.c:395\nRead of size 8 at addr 0000000000000028 by task syz-executor199/2949\n\nCPU: 0 UID: 0 PID: 2949 Comm: syz-executor199 Not tainted 6.13.0-rc4-syzkaller-00076-gf097a36ef88d #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\nCall Trace:\n \u003cIRQ\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n kasan_report+0xd9/0x110 mm/kasan/report.c:602\n check_region_inline mm/kasan/generic.c:183 [inline]\n kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189\n instrument_atomic_read include/linux/instrumented.h:68 [inline]\n _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]\n is_event_supported drivers/input/input.c:67 [inline]\n input_event+0x42/0xa0 drivers/input/input.c:395\n input_report_key include/linux/input.h:439 [inline]\n key_down drivers/hid/hid-appleir.c:159 [inline]\n appleir_raw_event+0x3e5/0x5e0 drivers/hid/hid-appleir.c:232\n __hid_input_report.constprop.0+0x312/0x440 drivers/hid/hid-core.c:2111\n hid_ctrl+0x49f/0x550 drivers/hid/usbhid/hid-core.c:484\n __usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650\n usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734\n dummy_timer+0x17f7/0x3960 drivers/usb/gadget/udc/dummy_hcd.c:1993\n __run_hrtimer kernel/time/hrtimer.c:1739 [inline]\n __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1803\n hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1820\n handle_softirqs+0x206/0x8d0 kernel/softirq.c:561\n __do_softirq kernel/softirq.c:595 [inline]\n invoke_softirq kernel/softirq.c:435 [inline]\n __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:662\n irq_exit_rcu+0x9/0x30 kernel/softirq.c:678\n instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]\n sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049\n \u003c/IRQ\u003e\n \u003cTASK\u003e\n asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702\n __mod_timer+0x8f6/0xdc0 kernel/time/timer.c:1185\n add_timer+0x62/0x90 kernel/time/timer.c:1295\n schedule_timeout+0x11f/0x280 kernel/time/sleep_timeout.c:98\n usbhid_wait_io+0x1c7/0x380 drivers/hid/usbhid/hid-core.c:645\n usbhid_init_reports+0x19f/0x390 drivers/hid/usbhid/hid-core.c:784\n hiddev_ioctl+0x1133/0x15b0 drivers/hid/usbhid/hiddev.c:794\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl fs/ioctl.c:892 [inline]\n __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \u003c/TASK\u003e\n\nThis happens due to the malformed report items sent by the emulated device\nwhich results in a report, that has no fields, being added to the report list.\nDue to this appleir_input_configured() is never called, hidinput_connect()\nfails which results in the HID_CLAIMED_INPUT flag is not being set. However,\nit  does not make appleir_probe() fail and lets the event callback to be\ncalled without the associated input device.\n\nThus, add a check for the HID_CLAIMED_INPUT flag and leave the event hook\nearly if the driver didn\u0027t claim any input_dev for some reason. Moreover,\nsome other hid drivers accessing input_dev in their event callbacks do have\nsimilar checks, too.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T21:09:38.330Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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          "references": [
            {
              "url": "https://git.kernel.org/stable/c/6db423b00940b05df2a1265d3c7eabafe9f1734c"
            },
            {
              "url": "https://git.kernel.org/stable/c/0df1ac8ee417ad76760ff076faa4518a4d861894"
            },
            {
              "url": "https://git.kernel.org/stable/c/b1d95d733cd6e74f595653daddcfc357bea461e8"
            },
            {
              "url": "https://git.kernel.org/stable/c/8d39eb8c5e14f2f0f441eed832ef8a7b654e6fee"
            },
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            },
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              "url": "https://git.kernel.org/stable/c/68cdf6710f228dfd74f66ec61fbe636da2646a73"
            },
            {
              "url": "https://git.kernel.org/stable/c/2ff5baa9b5275e3acafdf7f2089f74cccb2f38d1"
            }
          ],
          "title": "HID: appleir: Fix potential NULL dereference at raw event handle",
          "x_generator": {
            "engine": "bippy-1.2.0"
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      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-21948",
        "datePublished": "2025-04-01T15:41:09.949Z",
        "dateReserved": "2024-12-29T08:45:45.790Z",
        "dateUpdated": "2026-05-11T21:09:38.330Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.