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CVE-2026-23419

Estado: ModificadaMedia (5.5)—

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

net/rds: Fix circular locking dependency in rds_tcp_tune

syzbot reported a circular locking dependency in rds_tcp_tune() where sk_net_refcnt_upgrade() is called while holding the socket lock:

The issue occurs because sk_net_refcnt_upgrade() performs memory allocation (via get_net_track() -> ref_tracker_alloc()) while the socket lock is held, creating a circular dependency with fs_reclaim.

Fix this by moving sk_net_refcnt_upgrade() outside the socket lock critical section. This is safe because the fields modified by the sk_net_refcnt_upgrade() call (sk_net_refcnt, ns_tracker) are not accessed by any concurrent code path at this point.

Detalles técnicos trazas, registros y código del informe original
======================================================
WARNING: possible circular locking dependency detected
======================================================
kworker/u10:8/15040 is trying to acquire lock:
ffffffff8e9aaf80 (fs_reclaim){+.+.}-{0:0},
at: __kmalloc_cache_noprof+0x4b/0x6f0

but task is already holding lock:
ffff88805a3c1ce0 (k-sk_lock-AF_INET6){+.+.}-{0:0},
at: rds_tcp_tune+0xd7/0x930

v2:
  - Corrected fixes tag
  - check patch line wrap nits
  - ai commentary nits

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)

Mostrar
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: Fix circular locking dependency in rds_tcp_tune\n\nsyzbot reported a circular locking dependency in rds_tcp_tune() where\nsk_net_refcnt_upgrade() is called while holding the socket lock:\n\n======================================================\nWARNING: possible circular locking dependency detected\n======================================================\nkworker/u10:8/15040 is trying to acquire lock:\nffffffff8e9aaf80 (fs_reclaim){+.+.}-{0:0},\nat: __kmalloc_cache_noprof+0x4b/0x6f0\n\nbut task is already holding lock:\nffff88805a3c1ce0 (k-sk_lock-AF_INET6){+.+.}-{0:0},\nat: rds_tcp_tune+0xd7/0x930\n\nThe issue occurs because sk_net_refcnt_upgrade() performs memory\nallocation (via get_net_track() -> ref_tracker_alloc()) while the\nsocket lock is held, creating a circular dependency with fs_reclaim.\n\nFix this by moving sk_net_refcnt_upgrade() outside the socket lock\ncritical section. This is safe because the fields modified by the\nsk_net_refcnt_upgrade() call (sk_net_refcnt, ns_tracker) are not\naccessed by any concurrent code path at this point.\n\nv2:\n  - Corrected fixes tag\n  - check patch line wrap nits\n  - ai commentary nits"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/rds: Corrección de la dependencia de bloqueo circular en rds_tcp_tune\n\nsyzbot informó de una dependencia de bloqueo circular en rds_tcp_tune() donde se llama a sk_net_refcnt_upgrade() mientras se mantiene el bloqueo del socket:\n\n======================================================\nADVERTENCIA: posible dependencia de bloqueo circular detectada\n======================================================\nkworker/u10:8/15040 está intentando adquirir el bloqueo:\nffffffff8e9aaf80 (fs_reclaim){+.+.}-{0:0},\nen: __kmalloc_cache_noprof+0x4b/0x6f0\n\npero la tarea ya está manteniendo el bloqueo:\nffff88805a3c1ce0 (k-sk_lock-AF_INET6){+.+.}-{0:0},\nen: rds_tcp_tune+0xd7/0x930\n\nEl problema ocurre porque sk_net_refcnt_upgrade() realiza una asignación de memoria (a través de get_net_track()  ->  ref_tracker_alloc()) mientras se mantiene el bloqueo del socket, creando una dependencia circular con fs_reclaim.\n\nSolucione esto moviendo sk_net_refcnt_upgrade() fuera de la sección crítica del bloqueo del socket. Esto es seguro porque los campos modificados por la llamada a sk_net_refcnt_upgrade() (sk_net_refcnt, ns_tracker) no son accedidos por ninguna ruta de código concurrente en este punto.\n\nv2:\n  - Etiqueta de correcciones corregida\n  - revisar pequeños errores de ajuste de línea del parche\n  - pequeños errores en los comentarios de ai"
    }
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  "lastModified": "2026-07-24T21:10:00.143",
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