CVE-2025-71119 Details
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.
A vulnerability exists in the Linux kernel's handling of simultaneous multithreading (SMT) for PowerPC architectures during the kexec process. When SMT is turned off or only partially active, the system fails to properly wake offline CPUs after a new kernel image is loaded via kexec. This issue arises because the add_cpu() function cannot complete its task, as it encounters CPUs that are not considered bootable under the current SMT settings. The problem is addressed by re-enabling SMT and adjusting the SMT thread count to match the number of threads per core before all present CPUs are activated.
The vulnerability has been addressed in Linux kernel versions 6.6 and later. Users should upgrade to these versions to ensure proper SMT management during the kexec process.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0d5c9e901ad40bd39b38e119c0454b52d7663930 | kernel.org | Patch |
| https://git.kernel.org/stable/c/7cccd82a0e4aad192fd74fc60e61ed9aed5857a3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/c2296a1e42418556efbeb5636c4fa6aa6106713a | kernel.org | Patch |
| https://git.kernel.org/stable/c/d790ef0c4819424ee0c2f448c0a8154c5ca369d1 | kernel.org | Patch |
| https://git.kernel.org/stable/c/f0c0a681ffb77b8c5290c88c02d968199663939b | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.1.72, < 6.1.160 >= 6.5.12, < 6.6 >= 6.6.1, < 6.6.120 >= 6.7, < 6.12.64 >= 6.13, < 6.18.3 6.6 - 6.19 rc1 6.19 rc2 6.19 rc3 6.19 rc4 6.19 rc5 6.19 rc6 6.19 rc7 6.19 rc8 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Mar 25, 2026 | Initial Analysis | [email protected] |
| Jan 14, 2026 | New CVE Received | kernel.org |