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CVE-2026-23134

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

slab: fix kmalloc_nolock() context check for PREEMPT_RT

On PREEMPT_RT kernels, local_lock becomes a sleeping lock. The current check in kmalloc_nolock() only verifies we're not in NMI or hard IRQ context, but misses the case where preemption is disabled.

When a BPF program runs from a tracepoint with preemption disabled (preempt_count > 0), kmalloc_nolock() proceeds to call local_lock_irqsave() which attempts to acquire a sleeping lock, triggering:

Fix this by checking !preemptible() on PREEMPT_RT, which directly expresses the constraint that we cannot take a sleeping lock when preemption is disabled.

Leer descripción completaMostrar menos

This encompasses the previous checks for NMI and hard IRQ contexts while also catching cases where preemption is disabled.

Detalles técnicos trazas, registros y código del informe original
  BUG: sleeping function called from invalid context
  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6128
  preempt_count: 2, expected: 0

CVSS

Probabilidad de explotación (EPSS)

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)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nslab: fix kmalloc_nolock() context check for PREEMPT_RT\n\nOn PREEMPT_RT kernels, local_lock becomes a sleeping lock. The current\ncheck in kmalloc_nolock() only verifies we're not in NMI or hard IRQ\ncontext, but misses the case where preemption is disabled.\n\nWhen a BPF program runs from a tracepoint with preemption disabled\n(preempt_count > 0), kmalloc_nolock() proceeds to call\nlocal_lock_irqsave() which attempts to acquire a sleeping lock,\ntriggering:\n\n  BUG: sleeping function called from invalid context\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6128\n  preempt_count: 2, expected: 0\n\nFix this by checking !preemptible() on PREEMPT_RT, which directly\nexpresses the constraint that we cannot take a sleeping lock when\npreemption is disabled. This encompasses the previous checks for NMI\nand hard IRQ contexts while also catching cases where preemption is\ndisabled."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nslab: corrección de la verificación de contexto de kmalloc_nolock() para PREEMPT_RT\n\nEn kernels PREEMPT_RT, local_lock se convierte en un bloqueo de suspensión. La verificación actual en kmalloc_nolock() solo verifica que no estamos en un contexto NMI o de IRQ dura, pero omite el caso en que la preemption está deshabilitada.\n\nCuando un programa BPF se ejecuta desde un tracepoint con la preemption deshabilitada (preempt_count > 0), kmalloc_nolock() procede a llamar a local_lock_irqsave(), que intenta adquirir un bloqueo de suspensión, lo que desencadena:\n\n  BUG: función de suspensión llamada desde contexto inválido\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6128\n  preempt_count: 2, esperado: 0\n\nSolucione esto verificando !preemptible() en PREEMPT_RT, lo que expresa directamente la restricción de que no podemos tomar un bloqueo de suspensión cuando la preemption está deshabilitada. Esto abarca las verificaciones anteriores para contextos NMI e IRQ dura, al mismo tiempo que detecta casos en los que la preemption está deshabilitada."
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  "lastModified": "2026-06-17T10:20:57.740",
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