CVE-2025-71119
Estado: AnalizadaMedia (5.5)—
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:
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.
Detalles técnicos trazas, registros y código del informe original
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
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.14%
- Percentil entre todas las CVEs puntuadas: 3
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/0d5c9e901ad40bd39b38e119c0454b52d7663930
- https://git.kernel.org/stable/c/7cccd82a0e4aad192fd74fc60e61ed9aed5857a3
- https://git.kernel.org/stable/c/c2296a1e42418556efbeb5636c4fa6aa6106713a
- https://git.kernel.org/stable/c/d790ef0c4819424ee0c2f448c0a8154c5ca369d1
- https://git.kernel.org/stable/c/f0c0a681ffb77b8c5290c88c02d968199663939b
JSON original (NVD)
Mostrar
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/kexec: Enable SMT before waking offline CPUs\n\nIf SMT is disabled or a partial SMT state is enabled, when a new kernel\nimage is loaded for kexec, on reboot the following warning is observed:\n\nkexec: Waking offline cpu 228.\nWARNING: CPU: 0 PID: 9062 at arch/powerpc/kexec/core_64.c:223 kexec_prepare_cpus+0x1b0/0x1bc\n[snip]\n NIP kexec_prepare_cpus+0x1b0/0x1bc\n LR kexec_prepare_cpus+0x1a0/0x1bc\n Call Trace:\n kexec_prepare_cpus+0x1a0/0x1bc (unreliable)\n default_machine_kexec+0x160/0x19c\n machine_kexec+0x80/0x88\n kernel_kexec+0xd0/0x118\n __do_sys_reboot+0x210/0x2c4\n system_call_exception+0x124/0x320\n system_call_vectored_common+0x15c/0x2ec\n\nThis occurs as add_cpu() fails due to cpu_bootable() returning false for\nCPUs that fail the cpu_smt_thread_allowed() check or non primary\nthreads if SMT is disabled.\n\nFix the issue by enabling SMT and resetting the number of SMT threads to\nthe number of threads per core, before attempting to wake up all present\nCPUs."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\npowerpc/kexec: Habilitar SMT antes de activar las CPU sin conexión\n\nSi SMT está deshabilitado o un estado SMT parcial está habilitado, cuando una nueva imagen de kernel se carga para kexec, al reiniciar se observa la siguiente advertencia:\n\nkexec: Activando cpu 228 sin conexión.\nADVERTENCIA: CPU: 0 PID: 9062 en arch/powerpc/kexec/core_64.c:223 kexec_prepare_cpus+0x1b0/0x1bc\n[snip]\n NIP kexec_prepare_cpus+0x1b0/0x1bc\n LR kexec_prepare_cpus+0x1a0/0x1bc\n Traza de llamada:\n kexec_prepare_cpus+0x1a0/0x1bc (no fiable)\n default_machine_kexec+0x160/0x19c\n machine_kexec+0x80/0x88\n kernel_kexec+0xd0/0x118\n __do_sys_reboot+0x210/0x2c4\n system_call_exception+0x124/0x320\n system_call_vectored_common+0x15c/0x2ec\n\nEsto ocurre porque add_cpu() falla debido a que cpu_bootable() devuelve falso para las CPU que fallan la verificación cpu_smt_thread_allowed() o hilos no primarios si SMT está deshabilitado.\n\nSoluciona el problema habilitando SMT y restableciendo el número de hilos SMT al número de hilos por núcleo, antes de intentar activar todas las CPU presentes."
}
],
"lastModified": "2026-06-17T10:03:42.123",
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