In the Linux kernel, the following vulnerability has been resolved:
powerpc/kexec: Enable SMT before waking offline CPUs
If SMT is disabled or a partial SMT state is enabled, when a new kernel image is loaded for kexec, on reboot the following warning is observed:
kexec: Waking offline cpu 228. WARNING: CPU: 0 PID: 9062 at arch/powerpc/kexec/core_64.c:223 kexec_prepare_cpus+0x1b0/0x1bc [snip] NIP kexec_prepare_cpus+0x1b0/0x1bc LR kexec_prepare_cpus+0x1a0/0x1bc Call Trace: kexec_prepare_cpus+0x1a0/0x1bc (unreliable) default_machine_kexec+0x160/0x19c machine_kexec+0x80/0x88 kernel_kexec+0xd0/0x118 __do_sys_reboot+0x210/0x2c4 system_call_exception+0x124/0x320 system_call_vectored_common+0x15c/0x2ec
This occurs as add_cpu() fails due to cpu_bootable() returning false for CPUs that fail the cpu_smt_thread_allowed() check or non primary threads if SMT is disabled.
Fix the issue by enabling SMT and resetting the number of SMT threads to the number of threads per core, before attempting to wake up all present CPUs.
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 |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade perf6.12Upgrade kernel6.12-toolsUpgrade kernel6.12-modules-extraUpgrade kernel6.12-headersUpgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-tools-develUpgrade kernel6.12-debuginfo-common-x86_64Upgrade bpftool6.12Upgrade python3-perf6.12-debuginfoUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.12-libbpf-develUpgrade kernel6.12-modules-extra-commonUpgrade kernel6.12-debuginfoUpgrade bpftool6.12-debuginfoUpgrade python3-perf6.12Upgrade kernel6.12-libbpf-staticUpgrade kernel6.12Upgrade kernel-livepatch-6.12.64-87.122Upgrade kernel6.12-libbpfUpgrade kernel6.12-develUpgrade kernel6.12-libbpf-debuginfoUpgrade perf6.12-debuginfo | Feb 20, 2026 | Jan 14, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Feb 11, 2026 | Feb 11, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Jan 14, 2026 |
| Ubuntu | — | Upgrade linux-image-lowlatency-64kUpgrade linux-image-lowlatencyUpgrade linux-image-6.8.0-1059-azureUpgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-xilinxUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-realtimeUpgrade linux-image-oracle-64k-6.8Upgrade linux-image-oem-6.17Upgrade linux-image-oem-24.04bUpgrade linux-image-oem-22.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-nvidiaUpgrade linux-image-gkeop-6.8Upgrade linux-image-gcpUpgrade linux-image-azure-lts-24.04Upgrade linux-image-azure-6.8Upgrade linux-image-azure-6.17Upgrade linux-image-6.8.0-1052-aws-fipsUpgrade linux-image-6.17.0-1011-oracleUpgrade linux-image-intel-iot-realtimeUpgrade linux-image-oem-24.04aUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-azure-fips-6.8Upgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-generic-6.8Upgrade linux-image-aws-64kUpgrade linux-image-ibm-classicUpgrade linux-image-6.8.0-1051-nvidiaUpgrade linux-image-6.8.0-1054-gcp-fipsUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-oem-24.04Upgrade linux-image-ibm-6.8Upgrade linux-image-6.8.0-1049-oracle-64kUpgrade linux-image-generic-6.17Upgrade linux-image-6.8.0-1054-gcp-64kUpgrade linux-image-6.17.0-22-generic-64kUpgrade linux-image-6.8.0-110-fipsUpgrade linux-image-6.17.0-1010-realtimeUpgrade linux-image-oracleUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-raspi-realtimeUpgrade linux-image-6.8.0-1051-nvidia-lowlatencyUpgrade linux-image-6.8.0-1022-nvidia-tegra-rtUpgrade linux-image-oracle-6.17Upgrade linux-image-oem-22.04bUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-6.17.0-1020-oemUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-aws-6.17Upgrade linux-image-gcp-6.8Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-realtime-hwe-22.04Upgrade linux-image-intel-iotgUpgrade linux-image-virtualUpgrade linux-image-6.8.0-1054-azure-fipsUpgrade linux-image-ibmUpgrade linux-image-generic-lpaeUpgrade linux-image-genericUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-fips-6.8Upgrade linux-image-aws-64k-6.8Upgrade linux-image-6.17.0-1012-gcp-64kUpgrade linux-image-6.17.0-1012-awsUpgrade linux-image-6.17.0-1011-oracle-64kUpgrade linux-image-6.8.0-1050-gke-64kUpgrade linux-image-gcp-64k-6.8Upgrade linux-image-lowlatency-6.8Upgrade linux-image-oem-22.04cUpgrade linux-image-6.17.0-1013-azureUpgrade linux-image-kvmUpgrade linux-image-6.8.0-1037-gkeopUpgrade linux-image-aws-fips-6.8Upgrade linux-image-6.17.0-1014-raspiUpgrade linux-image-realtime-6.8.1Upgrade linux-image-gkeopUpgrade linux-image-virtual-6.8Upgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-1049-oracleUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-6.8.0-1029-xilinxUpgrade linux-image-generic-64k-6.17Upgrade linux-image-realtime-6.17Upgrade linux-image-generic-64kUpgrade linux-image-aws-64k-6.17Upgrade linux-image-gcp-6.17Upgrade linux-image-oracle-64k-6.17Upgrade linux-image-azure-fipsUpgrade linux-image-oem-24.04cUpgrade linux-image-gcp-64kUpgrade linux-image-xilinx-6.8Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-aws-lts-24.04Upgrade linux-image-raspi-6.8Upgrade linux-image-6.17.0-1012-aws-64kUpgrade linux-image-nvidia-6.8Upgrade linux-image-6.8.0-1052-awsUpgrade linux-image-6.8.1-1047-realtimeUpgrade linux-image-gke-64kUpgrade linux-image-gke-64k-6.8Upgrade linux-image-6.8.0-110-lowlatencyUpgrade linux-image-6.8.0-2042-raspi-realtimeUpgrade linux-image-6.8.0-1052-aws-64kUpgrade linux-image-gcp-64k-6.17Upgrade linux-image-6.8.0-1054-gcpUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-gke-6.8Upgrade linux-image-6.8.0-110-generic-64kUpgrade linux-image-gcp-fipsUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-generic-64k-6.8Upgrade linux-image-virtual-6.17Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-6.17.0-22-genericUpgrade linux-image-aws-6.8Upgrade linux-image-6.8.0-1051-nvidia-lowlatency-64kUpgrade linux-image-aws-fipsUpgrade linux-image-6.8.0-1054-azureUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-6.8.0-1051-ibmUpgrade linux-image-6.17.0-1012-gcpUpgrade linux-image-6.8.0-1052-raspiUpgrade linux-image-raspiUpgrade linux-image-oracle-6.8Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-oem-22.04dUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-nvidia-tegraUpgrade linux-image-azureUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-raspi-6.17Upgrade linux-image-oracle-64kUpgrade linux-image-oem-24.04dUpgrade linux-image-gkeUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-6.8.0-110-genericUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-fipsUpgrade linux-image-awsUpgrade linux-image-6.8.0-110-lowlatency-64kUpgrade linux-image-6.8.0-1050-gkeUpgrade linux-image-6.8.0-1022-nvidia-tegraUpgrade linux-image-oem-22.04aUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-6.8.0-1051-nvidia-64k | Apr 17, 2026 | Jan 14, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 10, 2026 | Jan 14, 2026 |
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