CVE-2025-71119None▾ SunlitIn 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 f…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= 482fa21635c8832db022cd2d649db26b8e6170ac < 7cccd82a0e4aad192fd74fc60e61ed9aed5857a3Linux >= 38253464bc821d6de6bba81bb1412ebb36f6cbd1 < d790ef0c4819424ee0c2f448c0a8154c5ca369d1Linux >= 38253464bc821d6de6bba81bb1412ebb36f6cbd1 < f0c0a681ffb77b8c5290c88c02d968199663939bLinux >= 38253464bc821d6de6bba81bb1412ebb36f6cbd1 < 0d5c9e901ad40bd39b38e119c0454b52d7663930Linux >= 38253464bc821d6de6bba81bb1412ebb36f6cbd1 < c2296a1e42418556efbeb5636c4fa6aa6106713aLinux 15141adf85b14a7cff7abba1cb983f0bf17e3b36Linux >= 6.1.72 < 6.1.160Linux >= 6.5.12 < 6.6Linux 6.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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