CVE-2025-38593

Estado: ModificadaAlta (7.8)—

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

Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'

Function 'hci_discovery_filter_clear()' frees 'uuids' array and then sets it to NULL. There is a tiny chance of the following race:

'hci_cmd_sync_work()'

'update_passive_scan_sync()'

To fix it let's add locking around 'kfree()' call and NULL pointer assignment. Otherwise the following backtrace fires:

Detalles técnicos trazas, registros y código del informe original

   'hci_update_passive_scan_sync()'

     'hci_discovery_filter_clear()'
       kfree(uuids);

       <-------------------------preempted-------------------------------->
                                           'start_service_discovery()'

                                             'hci_discovery_filter_clear()'
                                               kfree(uuids); // DOUBLE FREE

       <-------------------------preempted-------------------------------->

      uuids = NULL;

[ ] ------------[ cut here ]------------
[ ] kernel BUG at mm/slub.c:547!
[ ] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
[ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1
[ ] Tainted: [O]=OOT_MODULE
[ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ ] pc : __slab_free+0xf8/0x348
[ ] lr : __slab_free+0x48/0x348
...
[ ] Call trace:
[ ]  __slab_free+0xf8/0x348
[ ]  kfree+0x164/0x27c
[ ]  start_service_discovery+0x1d0/0x2c0
[ ]  hci_sock_sendmsg+0x518/0x924
[ ]  __sock_sendmsg+0x54/0x60
[ ]  sock_write_iter+0x98/0xf8
[ ]  do_iter_readv_writev+0xe4/0x1c8
[ ]  vfs_writev+0x128/0x2b0
[ ]  do_writev+0xfc/0x118
[ ]  __arm64_sys_writev+0x20/0x2c
[ ]  invoke_syscall+0x68/0xf0
[ ]  el0_svc_common.constprop.0+0x40/0xe0
[ ]  do_el0_svc+0x1c/0x28
[ ]  el0_svc+0x30/0xd0
[ ]  el0t_64_sync_handler+0x100/0x12c
[ ]  el0t_64_sync+0x194/0x198
[ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000)
[ ] ---[ end trace 0000000000000000 ]---

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.17%
Percentil entre todas las CVEs puntuadas: 6
Fecha de la puntuación: 6/10/2026

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1499.004 Application or System Exploitationimpact70 %
Impacto secundarioT1529 System Shutdown/Rebootimpact65 %

Vulnerabilidad local (AV:L/PR:L) que causa double free en kernel Linux. La race condition permite DoS por crash del sistema o ejecución de código con privilegios elevados mediante manipulación de memoria.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-415

Referencias

JSON original (NVD)

Mostrar

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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'\n\nFunction 'hci_discovery_filter_clear()' frees 'uuids' array and then\nsets it to NULL. There is a tiny chance of the following race:\n\n'hci_cmd_sync_work()'\n\n 'update_passive_scan_sync()'\n\n   'hci_update_passive_scan_sync()'\n\n     'hci_discovery_filter_clear()'\n       kfree(uuids);\n\n       <-------------------------preempted-------------------------------->\n                                           'start_service_discovery()'\n\n                                             'hci_discovery_filter_clear()'\n                                               kfree(uuids); // DOUBLE FREE\n\n       <-------------------------preempted-------------------------------->\n\n      uuids = NULL;\n\nTo fix it let's add locking around 'kfree()' call and NULL pointer\nassignment. Otherwise the following backtrace fires:\n\n[ ] ------------[ cut here ]------------\n[ ] kernel BUG at mm/slub.c:547!\n[ ] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP\n[ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1\n[ ] Tainted: [O]=OOT_MODULE\n[ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ ] pc : __slab_free+0xf8/0x348\n[ ] lr : __slab_free+0x48/0x348\n...\n[ ] Call trace:\n[ ]  __slab_free+0xf8/0x348\n[ ]  kfree+0x164/0x27c\n[ ]  start_service_discovery+0x1d0/0x2c0\n[ ]  hci_sock_sendmsg+0x518/0x924\n[ ]  __sock_sendmsg+0x54/0x60\n[ ]  sock_write_iter+0x98/0xf8\n[ ]  do_iter_readv_writev+0xe4/0x1c8\n[ ]  vfs_writev+0x128/0x2b0\n[ ]  do_writev+0xfc/0x118\n[ ]  __arm64_sys_writev+0x20/0x2c\n[ ]  invoke_syscall+0x68/0xf0\n[ ]  el0_svc_common.constprop.0+0x40/0xe0\n[ ]  do_el0_svc+0x1c/0x28\n[ ]  el0_svc+0x30/0xd0\n[ ]  el0t_64_sync_handler+0x100/0x12c\n[ ]  el0t_64_sync+0x194/0x198\n[ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000)\n[ ] ---[ end trace 0000000000000000 ]---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Bluetooth: hci_sync: corrige la doble liberación en 'hci_discovery_filter_clear()' La función 'hci_discovery_filter_clear()' libera la matriz 'uuids' y luego la establece en NULL. Hay una pequeña posibilidad de la siguiente ejecución: 'hci_cmd_sync_work()' 'update_passive_scan_sync()' 'hci_update_passive_scan_sync()' 'hci_discovery_filter_clear()' kfree(uuids); &lt;-------------------------preempted--------------------------------&gt; 'start_service_discovery()' 'hci_discovery_filter_clear()' kfree(uuids); // DOBLE LIBERACIÓN &lt;-------------------------preempted--------------------------------&gt; uuids = NULL; Para solucionarlo, agreguemos un bloqueo alrededor de la llamada 'kfree()' y la asignación del puntero NULL. De lo contrario, se activa el siguiente backtrace: [ ] ------------[ cortar aquí ]------------ [ ] ¡ERROR del kernel en mm/slub.c:547! [ ] Error interno: Ups - ERROR: 00000000f2000800 [#1] PREEMPT SMP [ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1 [ ] Tainted: [O]=OOT_MODULE [ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ ] pc : __slab_free+0xf8/0x348 [ ] lr : __slab_free+0x48/0x348 ... [ ] Call trace: [ ] __slab_free+0xf8/0x348 [ ] kfree+0x164/0x27c [ ] start_service_discovery+0x1d0/0x2c0 [ ] hci_sock_sendmsg+0x518/0x924 [ ] __sock_sendmsg+0x54/0x60 [ ] sock_write_iter+0x98/0xf8 [ ] do_iter_readv_writev+0xe4/0x1c8 [ ] vfs_writev+0x128/0x2b0 [ ] do_writev+0xfc/0x118 [ ] __arm64_sys_writev+0x20/0x2c [ ] invoke_syscall+0x68/0xf0 [ ] el0_svc_common.constprop.0+0x40/0xe0 [ ] do_el0_svc+0x1c/0x28 [ ] el0_svc+0x30/0xd0 [ ] el0t_64_sync_handler+0x100/0x12c [ ] el0t_64_sync+0x194/0x198 [ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000) [ ] ---[ end trace 0000000000000000 ]-]---"
    }
  ],
  "lastModified": "2026-07-30T06:23:29.240",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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