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 ]
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Oct 6, 2025 | Oct 6, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernelUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel-tools | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-toolsUpgrade bpftoolUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernel | Feb 3, 2026 | Jan 30, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Oct 4, 2025 |
| Ubuntu | — | Upgrade linux-kvmUpgrade linux-oracle-5.15Upgrade linux-fipsUpgrade linux-intel-iotgUpgrade linux-riscv-5.15Upgrade linux-azure-fde-5.15Upgrade linux-gkeUpgrade linux-xilinx-zynqmpUpgrade linux-nvidiaUpgrade linux-oracle-5.4Upgrade linux-gkeopUpgrade linux-gcp-5.15Upgrade linux-gcp-5.4Upgrade linux-lowlatencyUpgrade linux-azure-fipsUpgrade linux-aws-hweUpgrade linux-raspiUpgrade linux-aws-5.15Upgrade linux-aws-5.4Upgrade linux-azure-5.15Upgrade linux-gcpUpgrade linux-oracleUpgrade linux-hwe-5.4Upgrade linux-realtimeUpgrade linux-gcp-4.15Upgrade linux-hwe-5.15Upgrade linux-raspi-5.4Upgrade linux-intel-iotg-5.15Upgrade linux-gcp-fipsUpgrade linux-aws-fipsUpgrade linux-awsUpgrade linux-azureUpgrade linux-iotUpgrade linux-azure-4.15Upgrade linux-azure-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linux-hweUpgrade linux-ibm-5.4Upgrade linux-azure-fdeUpgrade linux-bluefieldUpgrade linux-ibmUpgrade linux | Oct 10, 2025 | Oct 4, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Oct 4, 2025 |
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