CVE-2022-49740

Status: ModifiedHigh (7.1)—

In the Linux kernel, the following vulnerability has been resolved:

wifi: brcmfmac: Check the count value of channel spec to prevent out-of-bounds reads

This patch fixes slab-out-of-bounds reads in brcmfmac that occur in brcmf_construct_chaninfo() and brcmf_enable_bw40_2g() when the count value of channel specifications provided by the device is greater than the length of 'list->element[]', decided by the size of the 'list' allocated with kzalloc(). The patch adds checks that make the functions free the buffer and return -EINVAL if that is the case. Note that the negative return is handled by the caller, brcmf_setup_wiphybands() or brcmf_cfg80211_attach().

Read full descriptionShow less

Found by a modified version of syzkaller.

Crash Report from brcmf_enable_bw40_2g(): ========== ---truncated---

Technical details traces, logs and code from the original report

Crash Report from brcmf_construct_chaninfo():
==================================================================
BUG: KASAN: slab-out-of-bounds in brcmf_setup_wiphybands+0x1238/0x1430
Read of size 4 at addr ffff888115f24600 by task kworker/0:2/1896

CPU: 0 PID: 1896 Comm: kworker/0:2 Tainted: G        W  O      5.14.0+ #132
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014
Workqueue: usb_hub_wq hub_event
Call Trace:
 dump_stack_lvl+0x57/0x7d
 print_address_description.constprop.0.cold+0x93/0x334
 kasan_report.cold+0x83/0xdf
 brcmf_setup_wiphybands+0x1238/0x1430
 brcmf_cfg80211_attach+0x2118/0x3fd0
 brcmf_attach+0x389/0xd40
 brcmf_usb_probe+0x12de/0x1690
 usb_probe_interface+0x25f/0x710
 really_probe+0x1be/0xa90
 __driver_probe_device+0x2ab/0x460
 driver_probe_device+0x49/0x120
 __device_attach_driver+0x18a/0x250
 bus_for_each_drv+0x123/0x1a0
 __device_attach+0x207/0x330
 bus_probe_device+0x1a2/0x260
 device_add+0xa61/0x1ce0
 usb_set_configuration+0x984/0x1770
 usb_generic_driver_probe+0x69/0x90
 usb_probe_device+0x9c/0x220
 really_probe+0x1be/0xa90
 __driver_probe_device+0x2ab/0x460
 driver_probe_device+0x49/0x120
 __device_attach_driver+0x18a/0x250
 bus_for_each_drv+0x123/0x1a0
 __device_attach+0x207/0x330
 bus_probe_device+0x1a2/0x260
 device_add+0xa61/0x1ce0
 usb_new_device.cold+0x463/0xf66
 hub_event+0x10d5/0x3330
 process_one_work+0x873/0x13e0
 worker_thread+0x8b/0xd10
 kthread+0x379/0x450
 ret_from_fork+0x1f/0x30

Allocated by task 1896:
 kasan_save_stack+0x1b/0x40
 __kasan_kmalloc+0x7c/0x90
 kmem_cache_alloc_trace+0x19e/0x330
 brcmf_setup_wiphybands+0x290/0x1430
 brcmf_cfg80211_attach+0x2118/0x3fd0
 brcmf_attach+0x389/0xd40
 brcmf_usb_probe+0x12de/0x1690
 usb_probe_interface+0x25f/0x710
 really_probe+0x1be/0xa90
 __driver_probe_device+0x2ab/0x460
 driver_probe_device+0x49/0x120
 __device_attach_driver+0x18a/0x250
 bus_for_each_drv+0x123/0x1a0
 __device_attach+0x207/0x330
 bus_probe_device+0x1a2/0x260
 device_add+0xa61/0x1ce0
 usb_set_configuration+0x984/0x1770
 usb_generic_driver_probe+0x69/0x90
 usb_probe_device+0x9c/0x220
 really_probe+0x1be/0xa90
 __driver_probe_device+0x2ab/0x460
 driver_probe_device+0x49/0x120
 __device_attach_driver+0x18a/0x250
 bus_for_each_drv+0x123/0x1a0
 __device_attach+0x207/0x330
 bus_probe_device+0x1a2/0x260
 device_add+0xa61/0x1ce0
 usb_new_device.cold+0x463/0xf66
 hub_event+0x10d5/0x3330
 process_one_work+0x873/0x13e0
 worker_thread+0x8b/0xd10
 kthread+0x379/0x450
 ret_from_fork+0x1f/0x30

The buggy address belongs to the object at ffff888115f24000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1536 bytes inside of
 2048-byte region [ffff888115f24000, ffff888115f24800)

Memory state around the buggy address:
 ffff888115f24500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888115f24580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888115f24600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff888115f24680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888115f24700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Base score: 7.1

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.19%
Percentile among all scored CVEs: 8
Score date: 10/5/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Primary impactT1059 Command and Scripting Interpreterexecution40 %
Secondary impactT1499.004 Application or System Exploitationimpact65 %

Vulnerabilidad de lectura fuera de límites (CWE-125) en controlador WiFi del kernel Linux con acceso local (AV:L) y privilegios limitados (PR:L). El crash ocurre durante inicialización del dispositivo USB, potencialmente explotable para escalada de privilegios o denegación de servicio.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Filter Network Traffic

Affected technologies (1)

Linux — Linux Kernel

CWEs

CWE-125
CWE-125

References

Raw JSON (NVD)

Show

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            },
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              "version": "5.4.232",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
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              "version": "5.10.168",
              "versionType": "semver",
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          "programFiles": [
            "drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c"
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  "published": "2025-03-27T17:15:38.583",
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: Check the count value of channel spec to prevent out-of-bounds reads\n\nThis patch fixes slab-out-of-bounds reads in brcmfmac that occur in\nbrcmf_construct_chaninfo() and brcmf_enable_bw40_2g() when the count\nvalue of channel specifications provided by the device is greater than\nthe length of 'list->element[]', decided by the size of the 'list'\nallocated with kzalloc(). The patch adds checks that make the functions\nfree the buffer and return -EINVAL if that is the case. Note that the\nnegative return is handled by the caller, brcmf_setup_wiphybands() or\nbrcmf_cfg80211_attach().\n\nFound by a modified version of syzkaller.\n\nCrash Report from brcmf_construct_chaninfo():\n==================================================================\nBUG: KASAN: slab-out-of-bounds in brcmf_setup_wiphybands+0x1238/0x1430\nRead of size 4 at addr ffff888115f24600 by task kworker/0:2/1896\n\nCPU: 0 PID: 1896 Comm: kworker/0:2 Tainted: G        W  O      5.14.0+ #132\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014\nWorkqueue: usb_hub_wq hub_event\nCall Trace:\n dump_stack_lvl+0x57/0x7d\n print_address_description.constprop.0.cold+0x93/0x334\n kasan_report.cold+0x83/0xdf\n brcmf_setup_wiphybands+0x1238/0x1430\n brcmf_cfg80211_attach+0x2118/0x3fd0\n brcmf_attach+0x389/0xd40\n brcmf_usb_probe+0x12de/0x1690\n usb_probe_interface+0x25f/0x710\n really_probe+0x1be/0xa90\n __driver_probe_device+0x2ab/0x460\n driver_probe_device+0x49/0x120\n __device_attach_driver+0x18a/0x250\n bus_for_each_drv+0x123/0x1a0\n __device_attach+0x207/0x330\n bus_probe_device+0x1a2/0x260\n device_add+0xa61/0x1ce0\n usb_set_configuration+0x984/0x1770\n usb_generic_driver_probe+0x69/0x90\n usb_probe_device+0x9c/0x220\n really_probe+0x1be/0xa90\n __driver_probe_device+0x2ab/0x460\n driver_probe_device+0x49/0x120\n __device_attach_driver+0x18a/0x250\n bus_for_each_drv+0x123/0x1a0\n __device_attach+0x207/0x330\n bus_probe_device+0x1a2/0x260\n device_add+0xa61/0x1ce0\n usb_new_device.cold+0x463/0xf66\n hub_event+0x10d5/0x3330\n process_one_work+0x873/0x13e0\n worker_thread+0x8b/0xd10\n kthread+0x379/0x450\n ret_from_fork+0x1f/0x30\n\nAllocated by task 1896:\n kasan_save_stack+0x1b/0x40\n __kasan_kmalloc+0x7c/0x90\n kmem_cache_alloc_trace+0x19e/0x330\n brcmf_setup_wiphybands+0x290/0x1430\n brcmf_cfg80211_attach+0x2118/0x3fd0\n brcmf_attach+0x389/0xd40\n brcmf_usb_probe+0x12de/0x1690\n usb_probe_interface+0x25f/0x710\n really_probe+0x1be/0xa90\n __driver_probe_device+0x2ab/0x460\n driver_probe_device+0x49/0x120\n __device_attach_driver+0x18a/0x250\n bus_for_each_drv+0x123/0x1a0\n __device_attach+0x207/0x330\n bus_probe_device+0x1a2/0x260\n device_add+0xa61/0x1ce0\n usb_set_configuration+0x984/0x1770\n usb_generic_driver_probe+0x69/0x90\n usb_probe_device+0x9c/0x220\n really_probe+0x1be/0xa90\n __driver_probe_device+0x2ab/0x460\n driver_probe_device+0x49/0x120\n __device_attach_driver+0x18a/0x250\n bus_for_each_drv+0x123/0x1a0\n __device_attach+0x207/0x330\n bus_probe_device+0x1a2/0x260\n device_add+0xa61/0x1ce0\n usb_new_device.cold+0x463/0xf66\n hub_event+0x10d5/0x3330\n process_one_work+0x873/0x13e0\n worker_thread+0x8b/0xd10\n kthread+0x379/0x450\n ret_from_fork+0x1f/0x30\n\nThe buggy address belongs to the object at ffff888115f24000\n which belongs to the cache kmalloc-2k of size 2048\nThe buggy address is located 1536 bytes inside of\n 2048-byte region [ffff888115f24000, ffff888115f24800)\n\nMemory state around the buggy address:\n ffff888115f24500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n ffff888115f24580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n>ffff888115f24600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n                   ^\n ffff888115f24680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n ffff888115f24700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n==================================================================\n\nCrash Report from brcmf_enable_bw40_2g():\n==========\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: wifi: brcmfmac: Comprueba el valor de conteo de la especificación del canal para evitar lecturas fuera de los límites Este parche corrige las lecturas fuera de los límites de slab en brcmfmac que ocurren en brcmf_construct_chaninfo() y brcmf_enable_bw40_2g() cuando el valor de conteo de las especificaciones del canal proporcionadas por el dispositivo es mayor que la longitud de 'list-&gt;element[]', decidida por el tamaño de la 'lista' asignada con kzalloc(). El parche agrega verificaciones que hacen que las funciones liberen el búfer y devuelvan -EINVAL si ese es el caso. Ten en cuenta que el retorno negativo lo maneja el llamador, brcmf_setup_wiphybands() o brcmf_cfg80211_attach(). Encontrado por una versión modificada de syzkaller. Informe de fallos de brcmf_construct_chaninfo(): ====================================================================== ERROR: KASAN: slab fuera de los límites en brcmf_setup_wiphybands+0x1238/0x1430 Lectura de tamaño 4 en la dirección ffff888115f24600 por la tarea kworker/0:2/1896 CPU: 0 PID: 1896 Comm: kworker/0:2 Contaminado: GWO 5.14.0+ #132 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 01/04/2014 Cola de trabajo: usb_hub_wq hub_event Rastreo de llamadas: dump_stack_lvl+0x57/0x7d print_address_description.constprop.0.cold+0x93/0x334 kasan_report.cold+0x83/0xdf brcmf_setup_wiphybands+0x1238/0x1430 brcmf_cfg80211_attach+0x2118/0x3fd0 brcmf_attach+0x389/0xd40 brcmf_usb_probe+0x12de/0x1690 usb_probe_interface+0x25f/0x710 really_probe+0x1be/0xa90 __driver_probe_device+0x2ab/0x460 driver_probe_device+0x49/0x120 __device_attach_driver+0x18a/0x250 bus_for_each_drv+0x123/0x1a0 __device_attach+0x207/0x330 bus_probe_device+0x1a2/0x260 device_add+0xa61/0x1ce0 usb_set_configuration+0x984/0x1770 usb_generic_driver_probe+0x69/0x90 usb_probe_device+0x9c/0x220 really_probe+0x1be/0xa90 __driver_probe_device+0x2ab/0x460 driver_probe_device+0x49/0x120 __device_attach_driver+0x18a/0x250 bus_for_each_drv+0x123/0x1a0 __device_attach+0x207/0x330 bus_probe_device+0x1a2/0x260 device_add+0xa61/0x1ce0 usb_new_device.cold+0x463/0xf66 hub_event+0x10d5/0x3330 process_one_work+0x873/0x13e0 worker_thread+0x8b/0xd10 kthread+0x379/0x450 ret_from_fork+0x1f/0x30 Allocated by task 1896: kasan_save_stack+0x1b/0x40 __kasan_kmalloc+0x7c/0x90 kmem_cache_alloc_trace+0x19e/0x330 brcmf_setup_wiphybands+0x290/0x1430 brcmf_cfg80211_attach+0x2118/0x3fd0 brcmf_attach+0x389/0xd40 brcmf_usb_probe+0x12de/0x1690 usb_probe_interface+0x25f/0x710 really_probe+0x1be/0xa90 __driver_probe_device+0x2ab/0x460 driver_probe_device+0x49/0x120 __device_attach_driver+0x18a/0x250 bus_for_each_drv+0x123/0x1a0 __device_attach+0x207/0x330 bus_probe_device+0x1a2/0x260 device_add+0xa61/0x1ce0 usb_set_configuration+0x984/0x1770 usb_generic_driver_probe+0x69/0x90 usb_probe_device+0x9c/0x220 really_probe+0x1be/0xa90 __driver_probe_device+0x2ab/0x460 driver_probe_device+0x49/0x120 __device_attach_driver+0x18a/0x250 bus_for_each_drv+0x123/0x1a0 __device_attach+0x207/0x330 bus_probe_device+0x1a2/0x260 device_add+0xa61/0x1ce0 usb_new_device.cold+0x463/0xf66 hub_event+0x10d5/0x3330 process_one_work+0x873/0x13e0 worker_thread+0x8b/0xd10 kthread+0x379/0x450 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff888115f24000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1536 bytes inside of 2048-byte region [ffff888115f24000, ffff888115f24800) Memory state around the buggy address: ffff888115f24500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888115f24580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 &gt;ffff888115f24600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888115f24680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888115f24700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc  ========================================================================== Informe de fallo de brcmf_enable_bw40_2g(): ========== ---truncado---"
    }
  ],
  "lastModified": "2026-06-17T05:19:00.713",
  "configurations": [
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