CVE-2022-50494
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-04

Last updated on: 2025-10-06

Assigner: kernel.org

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 ]
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Meta Information
Published
2025-10-04
Last Modified
2025-10-06
Generated
2026-05-07
AI Q&A
2025-10-04
EPSS Evaluated
2026-05-05
NVD
CVE-2022-50494
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
intel intel_powerclamp *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability occurs in the Linux kernel's intel_powerclamp thermal driver. When CPU 0 is offline and intel_powerclamp tries to inject idle states, it uses smp_processor_id() in preemptible code, which can cause a kernel crash (BUG). The issue arises because smp_processor_id() is not safe to use in this context, and the code should use get_cpu() instead to avoid the crash.


How can this vulnerability impact me? :

This vulnerability can cause the Linux kernel to crash (kernel BUG) when CPU 0 is offline and intel_powerclamp is used, potentially leading to system instability or downtime.


What immediate steps should I take to mitigate this vulnerability?

The vulnerability is caused by using smp_processor_id() in preemptible code, which can cause a kernel BUG when CPU 0 is offline and intel_powerclamp is used. To mitigate this, update the Linux kernel to a version where the intel_powerclamp driver uses get_cpu() instead of smp_processor_id(), as this change avoids the crash.


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