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CVE-2026-23419

Full vulnerability record from the local CVENow database.

Description

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

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-04-03 14:16:27.843000
Last modified
2026-10-30 13:18:38.410000
View original CVE JSON 
{
  "id": "CVE-2026-23419",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-04-03T14:16:27.843",
  "lastModified": "2026-10-30T13:18:38.410",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "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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              "versionType": "original_commit_for_fix",
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          "attackVector": "NETWORK",
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          "privilegesRequired": "NONE",
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          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
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        "source": "[email protected]",
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  "weaknesses": [
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      "description": [
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