CVE-2022-50494
In the Linux kernel, the following vulnerability has been resolved: thermal: intel_powerclamp: Use get_cpu() instead of smp_processor_id() to avoid crash When CPU 0 is offline and intel_powerclamp is used to inject idle, it generates kernel BUG: BUG:…
Does this matter?
Lower severity and a low EPSS score (0.16%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: thermal: intel_powerclamp: Use get_cpu() instead of smp_processor_id() to avoid crash When CPU 0 is offline and intel_powerclamp is used to inject idle, it generates kernel BUG: BUG: using smp_processor_id() in preemptible [00000000] code: bash/15687 caller is debug_smp_processor_id+0x17/0x20 CPU: 4 PID: 15687 Comm: bash Not tainted 5.19.0-rc7+ #57 Call Trace: <TASK> dump_stack_lvl+0x49/0x63 dump_stack+0x10/0x16 check_preemption_disabled+0xdd/0xe0 debug_smp_processor_id+0x17/0x20 powerclamp_set_cur_state+0x7f/0xf9 [intel_powerclamp] ... ... Here CPU 0 is the control CPU by default and changed to the current CPU, if CPU 0 offlined. This check has to be performed under cpus_read_lock(), hence the above warning. Use get_cpu() instead of smp_processor_id() to avoid this BUG. [ rjw: Subject edits ]
- 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
- 0.16% probability · 5th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0f91f66c568b316b19cb042cf50584467b3bdff4Patch
- https://git.kernel.org/stable/c/3e799e815097febbcb81b472285be824f5d089f9Patch
- https://git.kernel.org/stable/c/418fae0700e85a498062424f8656435c32cdb200Patch
- https://git.kernel.org/stable/c/513943bf879d45005213e6f5cfb7d9e9943f589fPatch
- https://git.kernel.org/stable/c/5614908434451aafbf9b24cb5247cf1d21269f76Patch
- https://git.kernel.org/stable/c/5a646c38f648185ee2c62f2a19da3c6f04e27612Patch
- https://git.kernel.org/stable/c/68b99e94a4a2db6ba9b31fe0485e057b9354a640Patch
- https://git.kernel.org/stable/c/6904727db0eb62fb0c2dce1cf331c341d97ee4b7Patch
- https://git.kernel.org/stable/c/6e2a347b304224b2aeb1c0ea000d1cf8a02cc592Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.