CVE-2022-50552

Estado: ModificadaAlta (7.8)—

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

blk-mq: use quiesced elevator switch when reinitializing queues

The hctx's run_work may be racing with the elevator switch when reinitializing hardware queues. The queue is merely frozen in this context, but that only prevents requests from allocating and doesn't stop the hctx work from running. The work may get an elevator pointer that's being torn down, and can result in use-after-free errors and kernel panics (example below). Use the quiesced elevator switch instead, and make the previous one static since it is now only used locally.

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Detalles técnicos trazas, registros y código del informe original

  nvme nvme0: resetting controller
  nvme nvme0: 32/0/0 default/read/poll queues
  BUG: kernel NULL pointer dereference, address: 0000000000000008
  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  PGD 80000020c8861067 P4D 80000020c8861067 PUD 250f8c8067 PMD 0
  Oops: 0000 [#1] SMP PTI
  Workqueue: kblockd blk_mq_run_work_fn
  RIP: 0010:kyber_has_work+0x29/0x70

  Call Trace:
   __blk_mq_do_dispatch_sched+0x83/0x2b0
   __blk_mq_sched_dispatch_requests+0x12e/0x170
   blk_mq_sched_dispatch_requests+0x30/0x60
   __blk_mq_run_hw_queue+0x2b/0x50
   process_one_work+0x1ef/0x380
   worker_thread+0x2d/0x3e0

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: 0.21%
Percentil entre todas las CVEs puntuadas: 10
Fecha de la puntuación: 5/10/2026

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 %

Vulnerabilidad de use-after-free (CWE-416) en kernel Linux con acceso local sin interacción (AV:L/PR:L/UI:N). Causa panics y corrupción de memoria que resulta en DoS, no en ejecución de código.

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-416

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-mq: use quiesced elevator switch when reinitializing queues\n\nThe hctx's run_work may be racing with the elevator switch when\nreinitializing hardware queues. The queue is merely frozen in this\ncontext, but that only prevents requests from allocating and doesn't\nstop the hctx work from running. The work may get an elevator pointer\nthat's being torn down, and can result in use-after-free errors and\nkernel panics (example below). Use the quiesced elevator switch instead,\nand make the previous one static since it is now only used locally.\n\n  nvme nvme0: resetting controller\n  nvme nvme0: 32/0/0 default/read/poll queues\n  BUG: kernel NULL pointer dereference, address: 0000000000000008\n  #PF: supervisor read access in kernel mode\n  #PF: error_code(0x0000) - not-present page\n  PGD 80000020c8861067 P4D 80000020c8861067 PUD 250f8c8067 PMD 0\n  Oops: 0000 [#1] SMP PTI\n  Workqueue: kblockd blk_mq_run_work_fn\n  RIP: 0010:kyber_has_work+0x29/0x70\n\n...\n\n  Call Trace:\n   __blk_mq_do_dispatch_sched+0x83/0x2b0\n   __blk_mq_sched_dispatch_requests+0x12e/0x170\n   blk_mq_sched_dispatch_requests+0x30/0x60\n   __blk_mq_run_hw_queue+0x2b/0x50\n   process_one_work+0x1ef/0x380\n   worker_thread+0x2d/0x3e0"
    }
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  "lastModified": "2026-06-17T05:23:46.710",
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