CVE-2026-31408

Full vulnerability record from the local CVENow database.
Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold sco_recv_frame() reads conn->sk under sco_conn_lock() but immediately releases the lock without holding a reference to the socket. A concurrent close() can free the socket between the lock release and the subsequent sk->sk_state access, resulting in a use-after-free. Other functions in the same file (sco_sock_timeout(), sco_conn_del()) correctly use sco_sock_hold() to safely hold a reference under the lock. Fix by using sco_sock_hold() to take a reference before releasing the lock, and adding sock_put() on all exit paths.
Severity
HIGH
CVSS score
8.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-04-06 08:16:38.757000
Last modified
2026-10-19 19:17:52.243000
View original CVE JSON
{
  "id": "CVE-2026-31408",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-04-06T08:16:38.757",
  "lastModified": "2026-10-19T19:17:52.243",
  "vulnStatus": "Modified",
  "cveTags": [],
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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold\n\nsco_recv_frame() reads conn->sk under sco_conn_lock() but immediately\nreleases the lock without holding a reference to the socket. A concurrent\nclose() can free the socket between the lock release and the subsequent\nsk->sk_state access, resulting in a use-after-free.\n\nOther functions in the same file (sco_sock_timeout(), sco_conn_del())\ncorrectly use sco_sock_hold() to safely hold a reference under the lock.\n\nFix by using sco_sock_hold() to take a reference before releasing the\nlock, and adding sock_put() on all exit paths."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: SCO: Corrección de uso después de liberación en sco_recv_frame() debido a la falta de sock_hold\n\nsco_recv_frame() lee conn -> sk bajo sco_conn_lock() pero libera inmediatamente el bloqueo sin mantener una referencia al socket. Una llamada concurrente a close() puede liberar el socket entre la liberación del bloqueo y el acceso posterior a sk -> sk_state, lo que resulta en un uso después de liberación.\n\nOtras funciones en el mismo archivo (sco_sock_timeout(), sco_conn_del()) usan correctamente sco_sock_hold() para mantener de forma segura una referencia bajo el bloqueo.\n\nSe corrige usando sco_sock_hold() para tomar una referencia antes de liberar el bloqueo, y añadiendo sock_put() en todas las rutas de salida."
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