{
  "cveId": "CVE-2021-47493",
  "url": "https://patchblox.com/security/cve/CVE-2021-47493",
  "summary": "CVE-2021-47493 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47493, released May 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ocfs2: fix race between searching chunks and rel...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ocfs2: fix race between searching chunks and release journal_head from buffer_head  Encountered a race between ocfs2_test_bg_bit_allocatable() and jbd2_journal_put_journal_head() resulting in the below vmcore.    PID: 106879  TASK: ffff880244ba9c00  CPU: 2   COMMAND: \u0022loop3\u0022   Call trace:     panic     oops_end     no_context     __bad_area_nosemaphore     bad_area_nosemaphore     __do_page_fault     do_page_fault     page_fault       [exception RIP: ocfs2_block_group_find_clear_bits\u002B316]     ocfs2_block_group_find_clear_bits [ocfs2]     ocfs2_cluster_group_search [ocfs2]     ocfs2_search_chain [ocfs2]     ocfs2_claim_suballoc_bits [ocfs2]     __ocfs2_claim_clusters [ocfs2]     ocfs2_claim_clusters [ocfs2]     ocfs2_local_alloc_slide_window [ocfs2]     ocfs2_reserve_local_alloc_bits [ocfs2]     ocfs2_reserve_clusters_with_limit [ocfs2]     ocfs2_reserve_clusters [ocfs2]     ocfs2_lock_refcount_allocators [ocfs2]     ocfs2_make_clusters_writable [ocfs2]     ocfs2_replace_cow [ocfs2]     ocfs2_refcount_cow [ocfs2]     ocfs2_file_write_iter [ocfs2]     lo_rw_aio     loop_queue_work     kthread_worker_fn     kthread     ret_from_fork  When ocfs2_test_bg_bit_allocatable() called bh2jh(bg_bh), the bg_bh-\u003Eb_private NULL as jbd2_journal_put_journal_head() raced and released the jounal head from the buffer head.  Needed to take bit lock for the bit \u0027BH_JournalHead\u0027 to fix this race.",
  "published": "2024-05-22T09:15:11Z",
  "severity": "medium",
  "cvss": 4.7,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00173,
  "epssPercentile": 0.06746,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.15.3-1",
      "fix": "DEBIAN-CVE-2021-47493",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47493",
      "released": "2024-05-22T09:15:11Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.15.3-1",
      "fix": "DEBIAN-CVE-2021-47493",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47493",
      "released": "2024-05-22T09:15:11Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.15.3-1",
      "fix": "DEBIAN-CVE-2021-47493",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47493",
      "released": "2024-05-22T09:15:11Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}