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…
Does this matter?
Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.22% probability · 13th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.