---
id: CVE-2022-50206
title: |-
  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 Oop…
summary: |-
  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 Oop…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - linux_kernel < 4.14.291
  - 'linux_kernel >= 4.15, < 4.19.256'
  - 'linux_kernel >= 4.20, < 5.4.211'
  - 'linux_kernel >= 5.5, < 5.10.137'
  - 'linux_kernel >= 5.11, < 5.15.61'
  - 'linux_kernel >= 5.16, < 5.18.18'
  - 'linux_kernel >= 5.19, < 5.19.2'
patched:
  - linux_kernel 5.19.2
published: '2025-06-18'
updated: '2026-08-15'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-50206'
references:
  - url: 'https://git.kernel.org/stable/c/04549063d5701976034d8c2bfda3d3a8cbf0409f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/07022e07017ee5540f5559b0aeb916e8383c1e1a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/353b4673d01c512303c45cf2346f630cda73b5c9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6a2fd114678d7fc1b5a0f8865ae98f1c17787455'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9d5fec6ba2e4117d196a8259ab54615ffe562460'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/af483947d472eccb79e42059276c4deed76f99a6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b51881b1da57fe9877125dfdd0aac5172958fcfd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cc69ef95988b9ef2fc730ec452a7441efb90ef5e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00241
epssPercentile: 0.13493
ingestedAt: '2026-08-15T13:26:45.138Z'
---

## Overview

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.

## Affected

- `linux_kernel < 4.14.291`
- `linux_kernel >= 4.15, < 4.19.256`
- `linux_kernel >= 4.20, < 5.4.211`
- `linux_kernel >= 5.5, < 5.10.137`
- `linux_kernel >= 5.11, < 5.15.61`
- `linux_kernel >= 5.16, < 5.18.18`
- `linux_kernel >= 5.19, < 5.19.2`

## Remediation

Upgrade past the affected range:

- `linux_kernel 5.19.2`