CVE-2025-71119

powerpc/kexec: Enable SMT before waking offline CPUs

State: Published
Severity: Not scored
Published: Jan 14, 2026
Updated: May 23, 2026
Reserved: Jan 13, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	482fa21635c8832db022cd2d649db26b8e6170ac to before 7cccd82a0e4aad192fd74fc60e61ed9aed5857a3Affected 38253464bc821d6de6bba81bb1412ebb36f6cbd1 to before d790ef0c4819424ee0c2f448c0a8154c5ca369d1Affected 38253464bc821d6de6bba81bb1412ebb36f6cbd1 to before f0c0a681ffb77b8c5290c88c02d968199663939bAffected 38253464bc821d6de6bba81bb1412ebb36f6cbd1 to before 0d5c9e901ad40bd39b38e119c0454b52d7663930Affected 38253464bc821d6de6bba81bb1412ebb36f6cbd1 to before c2296a1e42418556efbeb5636c4fa6aa6106713aAffected 15141adf85b14a7cff7abba1cb983f0bf17e3b36Affected 6.1.72 to before 6.1.160Affected 6.5.12 to before 6.6Affected
LinuxLinux	6.6Affected before 6.6Not affected 6.1.160 through 6.1.Not affected 6.6.120 through 6.6.Not affected 6.12.64 through 6.12.Not affected 6.18.3 through 6.18.Not affected 6.19 and laterNot affected

Product

Versions

LinuxLinux

482fa21635c8832db022cd2d649db26b8e6170ac to before 7cccd82a0e4aad192fd74fc60e61ed9aed5857a3Affected
38253464bc821d6de6bba81bb1412ebb36f6cbd1 to before d790ef0c4819424ee0c2f448c0a8154c5ca369d1Affected
38253464bc821d6de6bba81bb1412ebb36f6cbd1 to before f0c0a681ffb77b8c5290c88c02d968199663939bAffected
38253464bc821d6de6bba81bb1412ebb36f6cbd1 to before 0d5c9e901ad40bd39b38e119c0454b52d7663930Affected
38253464bc821d6de6bba81bb1412ebb36f6cbd1 to before c2296a1e42418556efbeb5636c4fa6aa6106713aAffected
15141adf85b14a7cff7abba1cb983f0bf17e3b36Affected
6.1.72 to before 6.1.160Affected
6.5.12 to before 6.6Affected

LinuxLinux

6.6Affected
before 6.6Not affected
6.1.160 through 6.1.*Not affected
6.6.120 through 6.6.*Not affected
6.12.64 through 6.12.*Not affected
6.18.3 through 6.18.*Not affected
6.19 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.