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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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\u0027re 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 \u003e 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: correcci\u00f3n de la verificaci\u00f3n de contexto de kmalloc_nolock() para PREEMPT_RT\n\nEn kernels PREEMPT_RT, local_lock se convierte en un bloqueo de suspensi\u00f3n. La verificaci\u00f3n 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 est\u00e1 deshabilitada.\n\nCuando un programa BPF se ejecuta desde un tracepoint con la preemption deshabilitada (preempt_count \u0026gt; 0), kmalloc_nolock() procede a llamar a local_lock_irqsave(), que intenta adquirir un bloqueo de suspensi\u00f3n, lo que desencadena:\n\n  BUG: funci\u00f3n de suspensi\u00f3n llamada desde contexto inv\u00e1lido\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 restricci\u00f3n de que no podemos tomar un bloqueo de suspensi\u00f3n cuando la preemption est\u00e1 deshabilitada. Esto abarca las verificaciones anteriores para contextos NMI e IRQ dura, al mismo tiempo que detecta casos en los que la preemption est\u00e1 deshabilitada."
    }
  ],
  "id": "CVE-2026-23134",
  "lastModified": "2026-03-17T21:16:27.177",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-02-14T16:15:53.377",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/99a3e3a1cfc93b8fe318c0a3a5cfb01f1d4ad53c"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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}