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 kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-headersUpgrade perf6.12Upgrade kernel6.12-toolsUpgrade kernel6.12-libbpf-develUpgrade kernel6.12-tools-develUpgrade python3-perf6.12-debuginfoUpgrade kernel6.12-debuginfoUpgrade kernel6.12-tools-debuginfoUpgrade bpftool6.12Upgrade kernel6.12-modules-extraUpgrade kernel6.12-modules-extra-commonUpgrade perf6.12-debuginfoUpgrade kernel6.12-libbpf-debuginfoUpgrade kernel6.12Upgrade bpftool6.12-debuginfoUpgrade kernel6.12-libbpf-staticUpgrade kernel6.12-libbpfUpgrade kernel-livepatch-6.12.64-87.122Upgrade kernel6.12-develUpgrade python3-perf6.12 | Feb 20, 2026 | Jan 14, 2026 |
| Debian | — | Upgrade linux-6.1Upgrade linux | Feb 11, 2026 | Feb 11, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Jan 14, 2026 |
| Ubuntu | — | Upgrade linux-image-nvidia-tegraUpgrade linux-image-aws-fipsUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-azureUpgrade linux-image-nvidia-64kUpgrade linux-image-kvmUpgrade linux-image-gcp-64k-6.17Upgrade linux-image-6.8.0-1051-ibmUpgrade linux-image-gkeopUpgrade linux-image-6.8.0-1054-azureUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-realtime-hwe-24.04Upgrade linux-image-gcp-fipsUpgrade linux-image-oem-24.04cUpgrade linux-image-aws-lts-24.04Upgrade linux-image-virtual-6.17Upgrade linux-image-6.8.0-2042-raspi-realtimeUpgrade linux-image-6.8.0-110-lowlatencyUpgrade linux-image-generic-64k-6.17Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-oem-22.04cUpgrade linux-image-6.8.0-1029-xilinxUpgrade linux-image-6.8.0-1049-oracleUpgrade linux-image-6.8.0-1052-awsUpgrade linux-image-6.8.0-1050-gke-64kUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.17.0-1012-gcpUpgrade linux-image-raspiUpgrade linux-image-6.17.0-1012-aws-64kUpgrade linux-image-6.8.0-1051-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1052-raspiUpgrade linux-image-6.17.0-1014-raspiUpgrade linux-image-gke-6.8Upgrade linux-image-aws-fips-6.8Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-gcp-64kUpgrade linux-image-realtime-6.17Upgrade linux-image-xilinx-6.8Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-6.8.0-1054-gcpUpgrade linux-image-oracle-64k-6.17Upgrade linux-image-gke-64k-6.8Upgrade linux-image-generic-64kUpgrade linux-image-nvidia-6.8Upgrade linux-image-6.8.1-1047-realtimeUpgrade linux-image-aws-64k-6.17Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-raspi-6.8Upgrade linux-image-azure-fipsUpgrade linux-image-virtual-6.8Upgrade linux-image-6.8.0-1052-aws-64kUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-realtime-6.8.1Upgrade linux-image-aws-6.8Upgrade linux-image-6.8.0-110-generic-64kUpgrade linux-image-gcp-6.17Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-generic-64k-6.8Upgrade linux-image-oracle-6.8Upgrade linux-image-gke-64kUpgrade linux-image-lowlatency-6.8Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-oem-22.04dUpgrade linux-image-6.8.0-1037-gkeopUpgrade linux-image-6.17.0-22-genericUpgrade linux-image-6.17.0-1013-azureUpgrade linux-image-6.17.0-1020-oemUpgrade linux-image-raspi-realtimeUpgrade linux-image-oem-24.04aUpgrade linux-image-oem-24.04bUpgrade linux-image-azure-fips-6.8Upgrade linux-image-6.8.0-1052-aws-fipsUpgrade linux-image-nvidiaUpgrade linux-image-oem-22.04Upgrade linux-image-gcp-6.8Upgrade linux-image-aws-6.17Upgrade linux-image-6.8.0-110-fipsUpgrade linux-image-6.8.0-1054-gcp-fipsUpgrade linux-image-6.17.0-22-generic-64kUpgrade linux-image-6.17.0-1010-realtimeUpgrade linux-image-oracleUpgrade linux-image-oem-24.04Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-intel-iotgUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.8.0-1049-oracle-64kUpgrade linux-image-azure-lts-24.04Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-gkeop-6.8Upgrade linux-image-gcpUpgrade linux-image-azure-6.8Upgrade linux-image-azure-6.17Upgrade linux-image-6.17.0-1011-oracleUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-oem-6.17Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-xilinxUpgrade linux-image-oracle-64k-6.8Upgrade linux-image-realtimeUpgrade linux-image-ibm-6.8Upgrade linux-image-ibmUpgrade linux-image-generic-6.17Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-6.8.0-1054-gcp-64kUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-lowlatencyUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-fipsUpgrade linux-image-awsUpgrade linux-image-6.8.0-110-lowlatency-64kUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-6.8.0-1059-azureUpgrade linux-image-6.8.0-1051-nvidia-64kUpgrade linux-image-virtualUpgrade linux-image-oem-22.04aUpgrade linux-image-6.8.0-1050-gkeUpgrade linux-image-6.8.0-1022-nvidia-tegraUpgrade linux-image-6.8.0-1054-azure-fipsUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.17.0-1011-oracle-64kUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-oem-24.04dUpgrade linux-image-oracle-64kUpgrade linux-image-6.17.0-1012-awsUpgrade linux-image-raspi-6.17Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-generic-lpaeUpgrade linux-image-genericUpgrade linux-image-fips-6.8Upgrade linux-image-aws-64k-6.8Upgrade linux-image-6.17.0-1012-gcp-64kUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-ibm-classicUpgrade linux-image-6.8.0-110-genericUpgrade linux-image-6.8.0-1051-nvidiaUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-gkeUpgrade linux-image-generic-6.8Upgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-aws-64kUpgrade linux-image-oracle-6.17Upgrade linux-image-oem-22.04bUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-6.8.0-1022-nvidia-tegra-rtUpgrade linux-image-6.8.0-1051-nvidia-lowlatency | 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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