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 Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Oct 6, 2025 | Oct 6, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernelUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-tools-libs | Feb 3, 2026 | Jan 30, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Oct 4, 2025 |
| Ubuntu | — | Upgrade linux-hwe-5.15Upgrade linux-hwe-5.4Upgrade linux-gcp-4.15Upgrade linux-realtimeUpgrade linuxUpgrade linux-bluefieldUpgrade linux-ibmUpgrade linux-azure-4.15Upgrade linux-hweUpgrade linux-ibm-5.4Upgrade linux-gcp-fipsUpgrade linux-azure-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linux-awsUpgrade linux-intel-iotg-5.15Upgrade linux-raspi-5.4Upgrade linux-iotUpgrade linux-azureUpgrade linux-aws-fipsUpgrade linux-intel-iotgUpgrade linux-xilinx-zynqmpUpgrade linux-gcp-5.15Upgrade linux-gcp-5.4Upgrade linux-fipsUpgrade linux-kvmUpgrade linux-lowlatencyUpgrade linux-aws-5.4Upgrade linux-oracle-5.4Upgrade linux-oracleUpgrade linux-riscv-5.15Upgrade linux-aws-5.15Upgrade linux-azure-fde-5.15Upgrade linux-gcpUpgrade linux-raspiUpgrade linux-azure-5.15Upgrade linux-gkeUpgrade linux-nvidiaUpgrade linux-aws-hweUpgrade linux-azure-fipsUpgrade linux-gkeopUpgrade linux-oracle-5.15 | 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 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub