CVE-2022-50206

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2022-50206
In the Linux kernel, the following vulnerability has been resolved: arm64: fix oops in concurrently setting insn_emulation sysctls emulation_proc_handler() changes table->data for proc_dointvec_minmax and can generate the following Oops if called concurrently with itself: | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 | Internal error: Oops: 96000006 [#1] SMP | Call trace: | update_insn_emulation_mode+0xc0/0x148 | emulation_proc_handler+0x64/0xb8 | proc_sys_call_handler+0x9c/0xf8 | proc_sys_write+0x18/0x20 | __vfs_write+0x20/0x48 | vfs_write+0xe4/0x1d0 | ksys_write+0x70/0xf8 | __arm64_sys_write+0x20/0x28 | el0_svc_common.constprop.0+0x7c/0x1c0 | el0_svc_handler+0x2c/0xa0 | el0_svc+0x8/0x200 To fix this issue, keep the table->data as &insn->current_mode and use container_of() to retrieve the insn pointer. Another mutex is used to protect against the current_mode update but not for retrieving insn_emulation as table->data is no longer changing.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/04549063d5701976034d8c2bfda3d3a8cbf0409f Patch
https://git.kernel.org/stable/c/07022e07017ee5540f5559b0aeb916e8383c1e1a Patch
https://git.kernel.org/stable/c/353b4673d01c512303c45cf2346f630cda73b5c9 Patch
https://git.kernel.org/stable/c/6a2fd114678d7fc1b5a0f8865ae98f1c17787455 Patch
https://git.kernel.org/stable/c/9d5fec6ba2e4117d196a8259ab54615ffe562460 Patch
https://git.kernel.org/stable/c/af483947d472eccb79e42059276c4deed76f99a6 Patch
https://git.kernel.org/stable/c/b51881b1da57fe9877125dfdd0aac5172958fcfd Patch
https://git.kernel.org/stable/c/cc69ef95988b9ef2fc730ec452a7441efb90ef5e Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

19 Nov 2025, 12:45

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64: se corrige el error al configurar simultáneamente sysctls emulation_proc_handler() de insn_emulation y cambia table->data para proc_dointvec_minmax, que puede generar el siguiente error si se llama simultáneamente consigo mismo: | No se puede controlar la desreferencia del puntero NULL del kernel en la dirección virtual 0000000000000010 | Error interno: Oops: 96000006 [#1] SMP | Rastreo de llamadas: | update_insn_emulation_mode+0xc0/0x148 | emulation_proc_handler+0x64/0xb8 | proc_sys_call_handler+0x9c/0xf8 | proc_sys_write+0x18/0x20 | __vfs_write+0x20/0x48 | Para solucionar este problema, mantenga la tabla->data como &insn->current_mode y use container_of() para recuperar el puntero insn. Se usa otro mutex para proteger contra la actualización de current_mode, pero no para recuperar la emulación insn, ya que la tabla->data ya no cambia.
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CWE CWE-476
References () https://git.kernel.org/stable/c/04549063d5701976034d8c2bfda3d3a8cbf0409f - () https://git.kernel.org/stable/c/04549063d5701976034d8c2bfda3d3a8cbf0409f - Patch
References () https://git.kernel.org/stable/c/07022e07017ee5540f5559b0aeb916e8383c1e1a - () https://git.kernel.org/stable/c/07022e07017ee5540f5559b0aeb916e8383c1e1a - Patch
References () https://git.kernel.org/stable/c/353b4673d01c512303c45cf2346f630cda73b5c9 - () https://git.kernel.org/stable/c/353b4673d01c512303c45cf2346f630cda73b5c9 - Patch
References () https://git.kernel.org/stable/c/6a2fd114678d7fc1b5a0f8865ae98f1c17787455 - () https://git.kernel.org/stable/c/6a2fd114678d7fc1b5a0f8865ae98f1c17787455 - Patch
References () https://git.kernel.org/stable/c/9d5fec6ba2e4117d196a8259ab54615ffe562460 - () https://git.kernel.org/stable/c/9d5fec6ba2e4117d196a8259ab54615ffe562460 - Patch
References () https://git.kernel.org/stable/c/af483947d472eccb79e42059276c4deed76f99a6 - () https://git.kernel.org/stable/c/af483947d472eccb79e42059276c4deed76f99a6 - Patch
References () https://git.kernel.org/stable/c/b51881b1da57fe9877125dfdd0aac5172958fcfd - () https://git.kernel.org/stable/c/b51881b1da57fe9877125dfdd0aac5172958fcfd - Patch
References () https://git.kernel.org/stable/c/cc69ef95988b9ef2fc730ec452a7441efb90ef5e - () https://git.kernel.org/stable/c/cc69ef95988b9ef2fc730ec452a7441efb90ef5e - Patch
First Time Linux
Linux linux Kernel

18 Jun 2025, 11:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-06-18 11:15

Updated : 2025-11-19 12:45

NVD link : CVE-2022-50206

Mitre link : CVE-2022-50206

CVE.ORG link : CVE-2022-50206

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference