{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31598",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31598"
  ],
  "published": "2026-04-24T14:43:40Z",
  "summary": "ocfs2: fix possible deadlock between unlink and dio_end_io_write",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix possible deadlock between unlink and dio_end_io_write\n\nocfs2_unlink takes orphan dir inode_lock first and then ip_alloc_sem,\nwhile in ocfs2_dio_end_io_write, it acquires these locks in reverse order.\nThis creates an ABBA lock ordering violation on lock classes\nocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE] and\nocfs2_file_ip_alloc_sem_key.\n\nLock Chain #0 (orphan dir inode_lock -> ip_alloc_sem):\nocfs2_unlink\n  ocfs2_prepare_orphan_dir\n    ocfs2_lookup_lock_orphan_dir\n      inode_lock(orphan_dir_inode) <- lock A\n    __ocfs2_prepare_orphan_dir\n      ocfs2_prepare_dir_for_insert\n        ocfs2_extend_dir\n\t  ocfs2_expand_inline_dir\n\t    down_write(&oi->ip_alloc_sem) <- Lock B\n\nLock Chain #1 (ip_alloc_sem -> orphan dir inode_lock):\nocfs2_dio_end_io_write\n  down_write(&oi->ip_alloc_sem) <- Lock B\n  ocfs2_del_inode_from_orphan()\n    inode_lock(orphan_dir_inode) <- Lock A\n\nDeadlock Scenario:\n  CPU0 (unlink)                     CPU1 (dio_end_io_write)\n  ------                            ------\n  inode_lock(orphan_dir_inode)\n                                    down_write(ip_alloc_sem)\n  down_write(ip_alloc_sem)\n                                    inode_lock(orphan_dir_inode)\n\nSince ip_alloc_sem is to protect allocation changes, which is unrelated\nwith operations in ocfs2_del_inode_from_orphan.  So move\nocfs2_del_inode_from_orphan out of ip_alloc_sem to fix the deadlock.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31598"
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}