{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-26757",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-26757"
  ],
  "published": "2024-04-03T17:31:22Z",
  "summary": "md: Don't ignore read-only array in md_check_recovery()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: Don't ignore read-only array in md_check_recovery()\n\nUsually if the array is not read-write, md_check_recovery() won't\nregister new sync_thread in the first place. And if the array is\nread-write and sync_thread is registered, md_set_readonly() will\nunregister sync_thread before setting the array read-only. md/raid\nfollow this behavior hence there is no problem.\n\nAfter commit f52f5c71f3d4 (\"md: fix stopping sync thread\"), following\nhang can be triggered by test shell/integrity-caching.sh:\n\n1) array is read-only. dm-raid update super block:\nrs_update_sbs\n ro = mddev->ro\n mddev->ro = 0\n  -> set array read-write\n md_update_sb\n\n2) register new sync thread concurrently.\n\n3) dm-raid set array back to read-only:\nrs_update_sbs\n mddev->ro = ro\n\n4) stop the array:\nraid_dtr\n md_stop\n  stop_sync_thread\n    set_bit(MD_RECOVERY_INTR, &mddev->recovery);\n    md_wakeup_thread_directly(mddev->sync_thread);\n    wait_event(..., !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))\n\n5) sync thread done:\n md_do_sync\n set_bit(MD_RECOVERY_DONE, &mddev->recovery);\n md_wakeup_thread(mddev->thread);\n\n6) daemon thread can't unregister sync thread:\n md_check_recovery\n  if (!md_is_rdwr(mddev) &&\n      !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))\n   return;\n  -> -> MD_RECOVERY_RUNNING can't be cleared, hence step 4 hang;\n\nThe root cause is that dm-raid manipulate 'mddev->ro' by itself,\nhowever, dm-raid really should stop sync thread before setting the\narray read-only. Unfortunately, I need to read more code before I\ncan refacter the handler of 'mddev->ro' in dm-raid, hence let's fix\nthe problem the easy way for now to prevent dm-raid regression.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-26757"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2ea169c5a0b1134d573d07fc27a16f327ad0e7d3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/55a48ad2db64737f7ffc0407634218cc6e4c513b"
    }
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
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