CVE-2026-23148
Full vulnerability record from the local CVENow database.
Description
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. 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: 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 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.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-02-14 16:15:54.913000
Last modified
2026-10-19 19:17:39.533000
View original CVE JSON
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{
"lang": "en",
"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."
},
{
"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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