Riskcovery

CVE-2022-50206

arm64: fix oops in concurrently setting insn_emulation sysctls

State
Published
Severity
Not scored
Published
Jun 18, 2025
Updated
Aug 15, 2026
Reserved
Jun 18, 2025

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 587064b610c703f259317d00dc37bf6d40f4fc74 to before 9d5fec6ba2e4117d196a8259ab54615ffe562460Affected
  • 587064b610c703f259317d00dc37bf6d40f4fc74 to before b51881b1da57fe9877125dfdd0aac5172958fcfdAffected
  • 587064b610c703f259317d00dc37bf6d40f4fc74 to before 04549063d5701976034d8c2bfda3d3a8cbf0409fAffected
  • 587064b610c703f259317d00dc37bf6d40f4fc74 to before 353b4673d01c512303c45cf2346f630cda73b5c9Affected
  • 587064b610c703f259317d00dc37bf6d40f4fc74 to before cc69ef95988b9ef2fc730ec452a7441efb90ef5eAffected
  • 587064b610c703f259317d00dc37bf6d40f4fc74 to before 6a2fd114678d7fc1b5a0f8865ae98f1c17787455Affected
  • 587064b610c703f259317d00dc37bf6d40f4fc74 to before 07022e07017ee5540f5559b0aeb916e8383c1e1aAffected
  • 587064b610c703f259317d00dc37bf6d40f4fc74 to before af483947d472eccb79e42059276c4deed76f99a6Affected
LinuxLinux
  • 3.19Affected
  • before 3.19Not affected
  • 4.14.291 through 4.14.*Not affected
  • 4.19.256 through 4.19.*Not affected
  • 5.4.211 through 5.4.*Not affected
  • 5.10.137 through 5.10.*Not affected
  • 5.15.61 through 5.15.*Not affected
  • 5.18.18 through 5.18.*Not affected
  • 5.19.2 through 5.19.*Not affected
  • 6.0 and laterNot affected

References

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