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CVE PROGRAM SOURCE RECORDUnscored

CVE-2025-71119

powerpc/kexec: Enable SMT before waking offline CPUs

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 482fa21635c8832db022cd2d649db26b8e6170ac to < 7cccd82a0e4aad192fd74fc60e61ed9aed5857a3affected
  • 38253464bc821d6de6bba81bb1412ebb36f6cbd1 to < d790ef0c4819424ee0c2f448c0a8154c5ca369d1affected
  • 38253464bc821d6de6bba81bb1412ebb36f6cbd1 to < f0c0a681ffb77b8c5290c88c02d968199663939baffected
  • 38253464bc821d6de6bba81bb1412ebb36f6cbd1 to < 0d5c9e901ad40bd39b38e119c0454b52d7663930affected
  • 38253464bc821d6de6bba81bb1412ebb36f6cbd1 to < c2296a1e42418556efbeb5636c4fa6aa6106713aaffected
  • 15141adf85b14a7cff7abba1cb983f0bf17e3b36affected
  • 6.1.72 to < 6.1.160affected
  • 6.5.12 to < 6.6affected

Linux Linux

Default version status: affected

  • 6.6affected
  • 0 to < 6.6unaffected
  • 6.1.160 to ≤ 6.1.*unaffected
  • 6.6.120 to ≤ 6.6.*unaffected
  • 6.12.64 to ≤ 6.12.*unaffected
  • 6.18.3 to ≤ 6.18.*unaffected
  • 6.19 to ≤ *unaffected

References