CVE-2026-46050

Estado: AnalizadaMedia (5.5)—

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

md/raid10: fix deadlock with check operation and nowait requests

When an array check is running it will raise the barrier at which point normal requests will become blocked and increment the nr_pending value to signal there is work pending inside of wait_barrier(). NOWAIT requests do not block and so will return immediately with an error, and additionally do not increment nr_pending in wait_barrier().

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Upstream change commit 43806c3d5b9b ("raid10: cleanup memleak at raid10_make_request") added a call to raid_end_bio_io() to fix a memory leak when NOWAIT requests hit this condition. raid_end_bio_io() eventually calls allow_barrier() and it will unconditionally do an atomic_dec_and_test(&conf->nr_pending) even though the corresponding increment on nr_pending didn't happen in the NOWAIT case.

This can be easily seen by starting a check operation while an application is doing nowait IO on the same array. This results in a deadlocked state due to nr_pending value underflowing and so the md resync thread gets stuck waiting for nr_pending to == 0.

Output of r10conf state of the array when we hit this condition:

Example of md_sync thread stuck waiting on raise_barrier() and other requests stuck in wait_barrier():

Detalles técnicos trazas, registros y código del informe original

crash> struct r10conf
	barrier = 1,
        nr_pending = {
          counter = -41
        },
        nr_waiting = 15,
        nr_queued = 0,

md1_resync
[<0>] raise_barrier+0xce/0x1c0
[<0>] raid10_sync_request+0x1ca/0x1ed0
[<0>] md_do_sync+0x779/0x1110
[<0>] md_thread+0x90/0x160
[<0>] kthread+0xbe/0xf0
[<0>] ret_from_fork+0x34/0x50
[<0>] ret_from_fork_asm+0x1a/0x30

kworker/u1040:2+flush-253:4
[<0>] wait_barrier+0x1de/0x220
[<0>] regular_request_wait+0x30/0x180
[<0>] raid10_make_request+0x261/0x1000
[<0>] md_handle_request+0x13b/0x230
[<0>] __submit_bio+0x107/0x1f0
[<0>] submit_bio_noacct_nocheck+0x16f/0x390
[<0>] ext4_io_submit+0x24/0x40
[<0>] ext4_do_writepages+0x254/0xc80
[<0>] ext4_writepages+0x84/0x120
[<0>] do_writepages+0x7a/0x260
[<0>] __writeback_single_inode+0x3d/0x300
[<0>] writeback_sb_inodes+0x1dd/0x470
[<0>] __writeback_inodes_wb+0x4c/0xe0
[<0>] wb_writeback+0x18b/0x2d0
[<0>] wb_workfn+0x2a1/0x400
[<0>] process_one_work+0x149/0x330
[<0>] worker_thread+0x2d2/0x410
[<0>] kthread+0xbe/0xf0
[<0>] ret_from_fork+0x34/0x50
[<0>] ret_from_fork_asm+0x1a/0x30

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.13%
Percentil entre todas las CVEs puntuadas: 2
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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-667

Referencias

JSON original (NVD)

Mostrar

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          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid10: fix deadlock with check operation and nowait requests\n\nWhen an array check is running it will raise the barrier at which point\nnormal requests will become blocked and increment the nr_pending value to\nsignal there is work pending inside of wait_barrier(). NOWAIT requests\ndo not block and so will return immediately with an error, and additionally\ndo not increment nr_pending in wait_barrier(). Upstream change commit\n43806c3d5b9b (\"raid10: cleanup memleak at raid10_make_request\") added a\ncall to raid_end_bio_io() to fix a memory leak when NOWAIT requests hit\nthis condition. raid_end_bio_io() eventually calls allow_barrier() and\nit will unconditionally do an atomic_dec_and_test(&conf->nr_pending) even\nthough the corresponding increment on nr_pending didn't happen in the\nNOWAIT case.\n\nThis can be easily seen by starting a check operation while an application\nis doing nowait IO on the same array. This results in a deadlocked state\ndue to nr_pending value underflowing and so the md resync thread gets stuck\nwaiting for nr_pending to == 0.\n\nOutput of r10conf state of the array when we hit this condition:\n\ncrash> struct r10conf\n\tbarrier = 1,\n        nr_pending = {\n          counter = -41\n        },\n        nr_waiting = 15,\n        nr_queued = 0,\n\nExample of md_sync thread stuck waiting on raise_barrier() and other\nrequests stuck in wait_barrier():\n\nmd1_resync\n[<0>] raise_barrier+0xce/0x1c0\n[<0>] raid10_sync_request+0x1ca/0x1ed0\n[<0>] md_do_sync+0x779/0x1110\n[<0>] md_thread+0x90/0x160\n[<0>] kthread+0xbe/0xf0\n[<0>] ret_from_fork+0x34/0x50\n[<0>] ret_from_fork_asm+0x1a/0x30\n\nkworker/u1040:2+flush-253:4\n[<0>] wait_barrier+0x1de/0x220\n[<0>] regular_request_wait+0x30/0x180\n[<0>] raid10_make_request+0x261/0x1000\n[<0>] md_handle_request+0x13b/0x230\n[<0>] __submit_bio+0x107/0x1f0\n[<0>] submit_bio_noacct_nocheck+0x16f/0x390\n[<0>] ext4_io_submit+0x24/0x40\n[<0>] ext4_do_writepages+0x254/0xc80\n[<0>] ext4_writepages+0x84/0x120\n[<0>] do_writepages+0x7a/0x260\n[<0>] __writeback_single_inode+0x3d/0x300\n[<0>] writeback_sb_inodes+0x1dd/0x470\n[<0>] __writeback_inodes_wb+0x4c/0xe0\n[<0>] wb_writeback+0x18b/0x2d0\n[<0>] wb_workfn+0x2a1/0x400\n[<0>] process_one_work+0x149/0x330\n[<0>] worker_thread+0x2d2/0x410\n[<0>] kthread+0xbe/0xf0\n[<0>] ret_from_fork+0x34/0x50\n[<0>] ret_from_fork_asm+0x1a/0x30"
    }
  ],
  "lastModified": "2026-06-17T10:52:58.077",
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