CVE-2025-21657
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
sched_ext: Replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass()
scx_ops_bypass() iterates all CPUs to re-enqueue all the scx tasks. For each CPU, it acquires a lock using rq_lock() regardless of whether a CPU is offline or the CPU is currently running a task in a higher scheduler class (e.g., deadline). The rq_lock() is supposed to be used for online CPUs, and the use of rq_lock() may trigger an unnecessary warning in rq_pin_lock(). Therefore, replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass().
Without this change, we observe the following warning:
Detalles técnicos trazas, registros y código del informe original
===== START ===== [ 6.615205] rq->balance_callback && rq->balance_callback != &balance_push_callback [ 6.615208] WARNING: CPU: 2 PID: 0 at kernel/sched/sched.h:1730 __schedule+0x1130/0x1c90 ===== END =====
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: 0.18%
- Percentil entre todas las CVEs puntuadas: 6
- 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
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass()\n\nscx_ops_bypass() iterates all CPUs to re-enqueue all the scx tasks.\nFor each CPU, it acquires a lock using rq_lock() regardless of whether\na CPU is offline or the CPU is currently running a task in a higher\nscheduler class (e.g., deadline). The rq_lock() is supposed to be used\nfor online CPUs, and the use of rq_lock() may trigger an unnecessary\nwarning in rq_pin_lock(). Therefore, replace rq_lock() to\nraw_spin_rq_lock() in scx_ops_bypass().\n\nWithout this change, we observe the following warning:\n\n===== START =====\n[ 6.615205] rq->balance_callback && rq->balance_callback != &balance_push_callback\n[ 6.615208] WARNING: CPU: 2 PID: 0 at kernel/sched/sched.h:1730 __schedule+0x1130/0x1c90\n===== END ====="
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sched_ext: Reemplace rq_lock() por raw_spin_rq_lock() en scx_ops_bypass() scx_ops_bypass() itera todas las CPU para volver a poner en cola todas las tareas de scx. Para cada CPU, adquiere un bloqueo mediante rq_lock() independientemente de si una CPU está fuera de línea o si la CPU está ejecutando actualmente una tarea en una clase de programador superior (por ejemplo, fecha límite). Se supone que rq_lock() se debe utilizar para CPU en línea, y el uso de rq_lock() puede activar una advertencia innecesaria en rq_pin_lock(). Por lo tanto, reemplace rq_lock() por raw_spin_rq_lock() en scx_ops_bypass(). Sin este cambio, observamos la siguiente advertencia: ===== START ===== [ 6.615205] rq->balance_callback && rq->balance_callback != &balance_push_callback [ 6.615208] ADVERTENCIA: CPU: 2 PID: 0 en kernel/sched/sched.h:1730 __schedule+0x1130/0x1c90 ===== END ========== "
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"lastModified": "2026-06-17T08:43:56.990",
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