CVE-2026-46050

Full vulnerability record from the local CVENow database.

Description

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(). 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: crash> struct r10conf barrier = 1, nr_pending = { counter = -41 }, nr_waiting = 15, nr_queued = 0, Example of md_sync thread stuck waiting on raise_barrier() and other requests stuck in wait_barrier(): 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

Severity

MEDIUM

CVSS score

5.5 (v3.1)

Vulnerability status

Modified

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-05-27 14:17:24.547000

Last modified

2026-11-06 17:17:33.293000

View original CVE JSON

{
  "id": "CVE-2026-46050",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-05-27T14:17:24.547",
  "lastModified": "2026-11-06T17:17:33.293",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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"
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          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
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