CVE-2025-38209

Estado: ModificadaAlta (7.8)—

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

nvme-tcp: remove tag set when second admin queue config fails

Commit 104d0e2f6222 ("nvme-fabrics: reset admin connection for secure concatenation") modified nvme_tcp_setup_ctrl() to call nvme_tcp_configure_admin_queue() twice. The first call prepares for DH-CHAP negotitation, and the second call is required for secure concatenation. However, this change triggered BUG KASAN slab-use-after- free in blk_mq_queue_tag_busy_iter(). This BUG can be recreated by repeating the blktests test case nvme/063 a few times [1].

When the BUG happens, nvme_tcp_create_ctrl() fails in the call chain below:

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The first call of nvme_tcp_configure_admin_queue() succeeds with new=true argument. The second call fails with new=false argument. This second call does not call nvme_remove_admin_tag_set() on failure, due to the new=false argument. Then the admin tag set is not removed. However, nvme_tcp_create_ctrl() assumes that nvme_tcp_setup_ctrl() would call nvme_remove_admin_tag_set(). Then it frees up struct nvme_tcp_ctrl which has admin_tag_set field. Later on, the timeout handler accesses the admin_tag_set field and causes the BUG KASAN slab-use-after-free.

To not leave the admin tag set, call nvme_remove_admin_tag_set() when the second nvme_tcp_configure_admin_queue() call fails. Do not return from nvme_tcp_setup_ctrl() on failure. Instead, jump to "destroy_admin" go-to label to call nvme_tcp_teardown_admin_queue() which calls nvme_remove_admin_tag_set().

Detalles técnicos trazas, registros y código del informe original

nvme_tcp_create_ctrl()
 nvme_tcp_alloc_ctrl() new=true             ... Alloc nvme_tcp_ctrl and admin_tag_set
 nvme_tcp_setup_ctrl() new=true
  nvme_tcp_configure_admin_queue() new=true ... Succeed
   nvme_alloc_admin_tag_set()               ... Alloc the tag set for admin_tag_set
  nvme_stop_keep_alive()
  nvme_tcp_teardown_admin_queue() remove=false
  nvme_tcp_configure_admin_queue() new=false
   nvme_tcp_alloc_admin_queue()             ... Fail, but do not call nvme_remove_admin_tag_set()
 nvme_uninit_ctrl()
 nvme_put_ctrl()                            ... Free up the nvme_tcp_ctrl and admin_tag_set

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: 0.36%
Percentil entre todas las CVEs puntuadas: 27
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 principalT1059 Command and Scripting Interpreterexecution65 %

Vulnerabilidad de use-after-free (CWE-416) con acceso local y privilegios de usuario (AV:L, PR:L). Permite escalada mediante manipulación de estructuras de kernel. Potencial ejecución de código en contexto privilegiado.

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

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: remove tag set when second admin queue config fails\n\nCommit 104d0e2f6222 (\"nvme-fabrics: reset admin connection for secure\nconcatenation\") modified nvme_tcp_setup_ctrl() to call\nnvme_tcp_configure_admin_queue() twice. The first call prepares for\nDH-CHAP negotitation, and the second call is required for secure\nconcatenation. However, this change triggered BUG KASAN slab-use-after-\nfree in blk_mq_queue_tag_busy_iter(). This BUG can be recreated by\nrepeating the blktests test case nvme/063 a few times [1].\n\nWhen the BUG happens, nvme_tcp_create_ctrl() fails in the call chain\nbelow:\n\nnvme_tcp_create_ctrl()\n nvme_tcp_alloc_ctrl() new=true             ... Alloc nvme_tcp_ctrl and admin_tag_set\n nvme_tcp_setup_ctrl() new=true\n  nvme_tcp_configure_admin_queue() new=true ... Succeed\n   nvme_alloc_admin_tag_set()               ... Alloc the tag set for admin_tag_set\n  nvme_stop_keep_alive()\n  nvme_tcp_teardown_admin_queue() remove=false\n  nvme_tcp_configure_admin_queue() new=false\n   nvme_tcp_alloc_admin_queue()             ... Fail, but do not call nvme_remove_admin_tag_set()\n nvme_uninit_ctrl()\n nvme_put_ctrl()                            ... Free up the nvme_tcp_ctrl and admin_tag_set\n\nThe first call of nvme_tcp_configure_admin_queue() succeeds with\nnew=true argument. The second call fails with new=false argument. This\nsecond call does not call nvme_remove_admin_tag_set() on failure, due to\nthe new=false argument. Then the admin tag set is not removed. However,\nnvme_tcp_create_ctrl() assumes that nvme_tcp_setup_ctrl() would call\nnvme_remove_admin_tag_set(). Then it frees up struct nvme_tcp_ctrl which\nhas admin_tag_set field. Later on, the timeout handler accesses the\nadmin_tag_set field and causes the BUG KASAN slab-use-after-free.\n\nTo not leave the admin tag set, call nvme_remove_admin_tag_set() when\nthe second nvme_tcp_configure_admin_queue() call fails. Do not return\nfrom nvme_tcp_setup_ctrl() on failure. Instead, jump to \"destroy_admin\"\ngo-to label to call nvme_tcp_teardown_admin_queue() which calls\nnvme_remove_admin_tag_set()."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nvme-tcp: eliminar el conjunto de etiquetas cuando falla la configuración de la segunda cola de administración. El commit 104d0e2f6222 (\"nvme-fabrics: restablecer la conexión de administración para una concatenación segura\") modificó nvme_tcp_setup_ctrl() para llamar a nvme_tcp_configure_admin_queue() dos veces. La primera llamada prepara la negociación DH-CHAP y la segunda es necesaria para la concatenación segura. Sin embargo, este cambio activó el error \"slab-use-after-free\" en blk_mq_queue_tag_busy_iter()\". Este error se puede recrear repitiendo el caso de prueba blktests nvme/063 varias veces [1]. Cuando ocurre el ERROR, nvme_tcp_create_ctrl() falla en la siguiente cadena de llamadas: nvme_tcp_create_ctrl() nvme_tcp_alloc_ctrl() new=true ... Asignar nvme_tcp_ctrl y admin_tag_set nvme_tcp_setup_ctrl() new=true nvme_tcp_configure_admin_queue() new=true ... Correcto nvme_alloc_admin_tag_set() ... Asignar el conjunto de etiquetas para admin_tag_set nvme_stop_keep_alive() nvme_tcp_teardown_admin_queue() remove=false nvme_tcp_configure_admin_queue() new=false nvme_tcp_alloc_admin_queue() ... Falla, pero no se llama nvme_remove_admin_tag_set() nvme_uninit_ctrl() nvme_put_ctrl() ... Libera nvme_tcp_ctrl y admin_tag_set La primera llamada de nvme_tcp_configure_admin_queue() tiene éxito con el argumento new=true. La segunda llamada falla con el argumento new=false. Esta segunda llamada no llama a nvme_remove_admin_tag_set() en caso de error, debido al argumento new=false. Entonces, el conjunto de etiquetas admin no se elimina. Sin embargo, nvme_tcp_create_ctrl() supone que nvme_tcp_setup_ctrl() llamaría a nvme_remove_admin_tag_set(). Luego libera la estructura nvme_tcp_ctrl que tiene el campo admin_tag_set. Posteriormente, el controlador de tiempo de espera accede al campo admin_tag_set y provoca el error \"BUG KASAN slab-use-after-free\". Para mantener la etiqueta admin activa, llame a nvme_remove_admin_tag_set() cuando falle la segunda llamada a nvme_tcp_configure_admin_queue(). No regrese de nvme_tcp_setup_ctrl() en caso de error. En su lugar, vaya a la etiqueta \"destroy_admin\" para llamar a nvme_tcp_teardown_admin_queue(), que a su vez llama a nvme_remove_admin_tag_set()."
    }
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  "lastModified": "2026-07-30T06:23:00.113",
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