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CVE-2022-49450

Estado: ModificadaMedia (5.5)—

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

rxrpc: Fix listen() setting the bar too high for the prealloc rings

AF_RXRPC's listen() handler lets you set the backlog up to 32 (if you bump up the sysctl), but whilst the preallocation circular buffers have 32 slots in them, one of them has to be a dead slot because we're using CIRC_CNT().

This means that listen(rxrpc_sock, 32) will cause an oops when the socket is closed because rxrpc_service_prealloc_one() allocated one too many calls and rxrpc_discard_prealloc() won't then be able to get rid of them because it'll think the ring is empty. rxrpc_release_calls_on_socket() then tries to abort them, but oopses because call->peer isn't yet set.

Leer descripción completaMostrar menos

Fix this by setting the maximum backlog to RXRPC_BACKLOG_MAX - 1 to match the ring capacity.

Detalles técnicos trazas, registros y código del informe original
 BUG: kernel NULL pointer dereference, address: 0000000000000086
 ...
 RIP: 0010:rxrpc_send_abort_packet+0x73/0x240 [rxrpc]
 Call Trace:
  <TASK>
  ? __wake_up_common_lock+0x7a/0x90
  ? rxrpc_notify_socket+0x8e/0x140 [rxrpc]
  ? rxrpc_abort_call+0x4c/0x60 [rxrpc]
  rxrpc_release_calls_on_socket+0x107/0x1a0 [rxrpc]
  rxrpc_release+0xc9/0x1c0 [rxrpc]
  __sock_release+0x37/0xa0
  sock_close+0x11/0x20
  __fput+0x89/0x240
  task_work_run+0x59/0x90
  do_exit+0x319/0xaa0

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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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix listen() setting the bar too high for the prealloc rings\n\nAF_RXRPC's listen() handler lets you set the backlog up to 32 (if you bump\nup the sysctl), but whilst the preallocation circular buffers have 32 slots\nin them, one of them has to be a dead slot because we're using CIRC_CNT().\n\nThis means that listen(rxrpc_sock, 32) will cause an oops when the socket\nis closed because rxrpc_service_prealloc_one() allocated one too many calls\nand rxrpc_discard_prealloc() won't then be able to get rid of them because\nit'll think the ring is empty.  rxrpc_release_calls_on_socket() then tries\nto abort them, but oopses because call->peer isn't yet set.\n\nFix this by setting the maximum backlog to RXRPC_BACKLOG_MAX - 1 to match\nthe ring capacity.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000086\n ...\n RIP: 0010:rxrpc_send_abort_packet+0x73/0x240 [rxrpc]\n Call Trace:\n  <TASK>\n  ? __wake_up_common_lock+0x7a/0x90\n  ? rxrpc_notify_socket+0x8e/0x140 [rxrpc]\n  ? rxrpc_abort_call+0x4c/0x60 [rxrpc]\n  rxrpc_release_calls_on_socket+0x107/0x1a0 [rxrpc]\n  rxrpc_release+0xc9/0x1c0 [rxrpc]\n  __sock_release+0x37/0xa0\n  sock_close+0x11/0x20\n  __fput+0x89/0x240\n  task_work_run+0x59/0x90\n  do_exit+0x319/0xaa0"
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rxrpc: Se corrige que listen() estableciera la barra demasiado alta para los anillos de preasignación El controlador listen() de AF_RXRPC le permite establecer el backlog hasta 32 (si aumenta el sysctl), pero mientras que los búferes circulares de preasignación tienen 32 ranuras en ellos, una de ellas tiene que ser una ranura muerta porque estamos usando CIRC_CNT(). Esto significa que listen(rxrpc_sock, 32) causará un oops cuando el socket se cierre porque rxrpc_service_prealloc_one() asignó una llamada de más y rxrpc_discard_prealloc() no podrá deshacerse de ellas porque pensará que el anillo está vacío. rxrpc_release_calls_on_socket() luego intenta abortarlas, pero falla porque call-&gt;peer aún no está configurado. Solucione esto configurando el backlog máximo en RXRPC_BACKLOG_MAX - 1 para que coincida con la capacidad del anillo. ERROR: desreferencia de puntero NULL del kernel, dirección: 0000000000000086 ... RIP: 0010:rxrpc_send_abort_packet+0x73/0x240 [rxrpc] Call Trace:  ? __wake_up_common_lock+0x7a/0x90 ? rxrpc_notify_socket+0x8e/0x140 [rxrpc] ? rxrpc_abort_call+0x4c/0x60 [rxrpc] rxrpc_release_calls_on_socket+0x107/0x1a0 [rxrpc] rxrpc_release+0xc9/0x1c0 [rxrpc] __sock_release+0x37/0xa0 sock_close+0x11/0x20 __fput+0x89/0x240 task_work_run+0x59/0x90 do_exit+0x319/0xaa0 "
    }
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  "lastModified": "2026-06-17T05:18:05.190",
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