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CVE-2026-23148

Estado: ModificadaMedia (5.5)—

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

nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference

There is a race condition in nvmet_bio_done() that can cause a NULL pointer dereference in blk_cgroup_bio_start():

1. nvmet_bio_done() is called when a bio completes 2. nvmet_req_complete() is called, which invokes req->ops->queue_response(req) 3. The queue_response callback can re-queue and re-submit the same request 4. The re-submission reuses the same inline_bio from nvmet_req 5.

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Meanwhile, nvmet_req_bio_put() (called after nvmet_req_complete) invokes bio_uninit() for inline_bio, which sets bio->bi_blkg to NULL 6. The re-submitted bio enters submit_bio_noacct_nocheck() 7. blk_cgroup_bio_start() dereferences bio->bi_blkg, causing a crash:

Fix this by reordering nvmet_bio_done() to call nvmet_req_bio_put() BEFORE nvmet_req_complete(). This ensures the bio is cleaned up before the request can be re-submitted, preventing the race condition.

Detalles técnicos trazas, registros y código del informe original
  BUG: kernel NULL pointer dereference, address: 0000000000000028
  #PF: supervisor read access in kernel mode
  RIP: 0010:blk_cgroup_bio_start+0x10/0xd0
  Call Trace:
   submit_bio_noacct_nocheck+0x44/0x250
   nvmet_bdev_execute_rw+0x254/0x370 [nvmet]
   process_one_work+0x193/0x3c0
   worker_thread+0x281/0x3a0

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)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference\n\nThere is a race condition in nvmet_bio_done() that can cause a NULL\npointer dereference in blk_cgroup_bio_start():\n\n1. nvmet_bio_done() is called when a bio completes\n2. nvmet_req_complete() is called, which invokes req->ops->queue_response(req)\n3. The queue_response callback can re-queue and re-submit the same request\n4. The re-submission reuses the same inline_bio from nvmet_req\n5. Meanwhile, nvmet_req_bio_put() (called after nvmet_req_complete)\n   invokes bio_uninit() for inline_bio, which sets bio->bi_blkg to NULL\n6. The re-submitted bio enters submit_bio_noacct_nocheck()\n7. blk_cgroup_bio_start() dereferences bio->bi_blkg, causing a crash:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000028\n  #PF: supervisor read access in kernel mode\n  RIP: 0010:blk_cgroup_bio_start+0x10/0xd0\n  Call Trace:\n   submit_bio_noacct_nocheck+0x44/0x250\n   nvmet_bdev_execute_rw+0x254/0x370 [nvmet]\n   process_one_work+0x193/0x3c0\n   worker_thread+0x281/0x3a0\n\nFix this by reordering nvmet_bio_done() to call nvmet_req_bio_put()\nBEFORE nvmet_req_complete(). This ensures the bio is cleaned up before\nthe request can be re-submitted, preventing the race condition."
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      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnvmet: corregir condición de carrera en nvmet_bio_done() que lleva a una desreferencia de puntero NULL\n\nExiste una condición de carrera en nvmet_bio_done() que puede causar una desreferencia de puntero NULL en blk_cgroup_bio_start():\n\n1. nvmet_bio_done() es llamada cuando un bio se completa\n2. nvmet_req_complete() es llamada, lo que invoca req->ops->queue_response(req)\n3. La devolución de llamada queue_response puede volver a encolar y volver a enviar la misma solicitud\n4. El reenvío reutiliza el mismo inline_bio de nvmet_req\n5. Mientras tanto, nvmet_req_bio_put() (llamada después de nvmet_req_complete) invoca bio_uninit() para inline_bio, lo que establece bio->bi_blkg en NULL\n6. El bio reenviado entra en submit_bio_noacct_nocheck()\n7. blk_cgroup_bio_start() desreferencia bio->bi_blkg, causando un fallo:\n\n  ERROR: desreferencia de puntero NULL del kernel, dirección: 0000000000000028\n  #PF: acceso de lectura de supervisor en modo kernel\n  RIP: 0010:blk_cgroup_bio_start+0x10/0xd0\n  Rastro de Llamada:\n   submit_bio_noacct_nocheck+0x44/0x250\n   nvmet_bdev_execute_rw+0x254/0x370 [nvmet]\n   process_one_work+0x193/0x3c0\n   worker_thread+0x281/0x3a0\n\nCorregir esto reordenando nvmet_bio_done() para llamar a nvmet_req_bio_put() ANTES de nvmet_req_complete(). Esto asegura que el bio se limpie antes de que la solicitud pueda ser reenviada, previniendo la condición de carrera."
    }
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  "lastModified": "2026-06-17T10:20:59.293",
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