CVE-2026-46050: Software Security Vulnerability Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7v6r-2w32-rrq7",
  "modified" : "2026-10-15T03:35:58Z",
  "published" : "2026-05-27T15:33:22Z",
  "aliases" : [ "CVE-2026-46050" ],
  "details" : "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",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-46050"
  }, {
    "type" : "WEB",
    "url" : "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1cdff2937c618f81058422bbdc4974a3e7ec9379"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2249983d971e6839b36284e6610390b2c217dfa1"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/42fe37c90184cd1568838b84b488934c3671c963"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/7d96f3120a7fb7210d21b520c5b6f495da6ba436"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/965d6162dd88cc7cc193cf7f5bfc132d8bbf0523"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ae356d5eb1331d678985799f893e436314834a87"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/cac2106bb9a2180b288079b49ed626414fb5bc45"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-667" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-05-27T14:17:24Z"
  }
}