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CVE-2025-21853

Estado: ModificadaMedia (5.5)—

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

bpf: avoid holding freeze_mutex during mmap operation

We use map->freeze_mutex to prevent races between map_freeze() and memory mapping BPF map contents with writable permissions. The way we naively do this means we'll hold freeze_mutex for entire duration of all the mm and VMA manipulations, which is completely unnecessary. This can potentially also lead to deadlocks, as reported by syzbot in [0].

So, instead, hold freeze_mutex only during writeability checks, bump (proactively) "write active" count for the map, unlock the mutex and proceed with mmap logic. And only if something went wrong during mmap logic, then undo that "write active" counter increment.

Detalles técnicos trazas, registros y código del informe original
  [0] https://lore.kernel.org/bpf/678dcbc9.050a0220.303755.0066.GAE@google.com/

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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          "integrityImpact": "NONE",
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: avoid holding freeze_mutex during mmap operation\n\nWe use map->freeze_mutex to prevent races between map_freeze() and\nmemory mapping BPF map contents with writable permissions. The way we\nnaively do this means we'll hold freeze_mutex for entire duration of all\nthe mm and VMA manipulations, which is completely unnecessary. This can\npotentially also lead to deadlocks, as reported by syzbot in [0].\n\nSo, instead, hold freeze_mutex only during writeability checks, bump\n(proactively) \"write active\" count for the map, unlock the mutex and\nproceed with mmap logic. And only if something went wrong during mmap\nlogic, then undo that \"write active\" counter increment.\n\n  [0] https://lore.kernel.org/bpf/678dcbc9.050a0220.303755.0066.GAE@google.com/"
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: evitar mantener freeze_mutex durante la operación mmap. Usamos map->freeze_mutex para evitar ejecuciones entre map_freeze() y el mapeo de memoria del contenido del mapa BPF con permisos de escritura. Esta forma ingenua de hacerlo implica mantener freeze_mutex durante todas las manipulaciones mm y VMA, lo cual es completamente innecesario. Esto también puede provocar interbloqueos, como informa syzbot en [0]. Por lo tanto, se mantiene freeze_mutex solo durante las comprobaciones de escritura, se aumenta (proactivamente) el contador de \"escritura activa\" del mapa, se desbloquea el mutex y se continúa con la lógica mmap. Solo si algo falla durante la lógica mmap, se deshace el incremento del contador de \"escritura activa\". [0] https://lore.kernel.org/bpf/678dcbc9.050a0220.303755.0066.GAE@google.com/"
    }
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