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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 587064b610c703f259317d00dc37bf6d40f4fc74, < 9d5fec6ba2e4117d196a8259ab54615ffe562460; >= 587064b610c703f259317d00dc37bf6d40f4fc74, < b51881b1da57fe9877125dfdd0aac5172958fcfd; >= 587064b610c703f259317d00dc37bf6d40f4fc74, < 04549063d5701976034d8c2bfda3d3a8cbf0409f; >= 587064b610c703f259317d00dc37bf6d40f4fc74, < 353b4673d01c512303c45cf2346f630cda73b5c9; >= 587064b610c703f259317d00dc37bf6d40f4fc74, < cc69ef95988b9ef2fc730ec452a7441efb90ef5e; >= 587064b610c703f259317d00dc37bf6d40f4fc74, < 6a2fd114678d7fc1b5a0f8865ae98f1c17787455; >= 587064b610c703f259317d00dc37bf6d40f4fc74, < 07022e07017ee5540f5559b0aeb916e8383c1e1a; >= 587064b610c703f259317d00dc37bf6d40f4fc74, < af483947d472eccb79e42059276c4deed76f99a6 |
| Linux | Linux | 3.19 |
References
- https://git.kernel.org/stable/c/04549063d5701976034d8c2bfda3d3a8cbf0409fPatch
- https://git.kernel.org/stable/c/07022e07017ee5540f5559b0aeb916e8383c1e1aPatch
- https://git.kernel.org/stable/c/353b4673d01c512303c45cf2346f630cda73b5c9Patch
- https://git.kernel.org/stable/c/6a2fd114678d7fc1b5a0f8865ae98f1c17787455Patch
- https://git.kernel.org/stable/c/9d5fec6ba2e4117d196a8259ab54615ffe562460Patch
- https://git.kernel.org/stable/c/af483947d472eccb79e42059276c4deed76f99a6Patch
- https://git.kernel.org/stable/c/b51881b1da57fe9877125dfdd0aac5172958fcfdPatch
- https://git.kernel.org/stable/c/cc69ef95988b9ef2fc730ec452a7441efb90ef5ePatch
Timeline
- Published
- Jun 18, 2025
- Last modified
- Aug 15, 2026
- NVD status
- Analyzed