{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a86a72a4a4e0ec109a98e2737948864ed6794bf7"
            },
            {
              "fixed": "297d8d7bb6a2bf133d3a3636edbdf94101cbd719"
            },
            {
              "fixed": "32630dee18c6bb2175c8a865a474749492eaf19c"
            },
            {
              "fixed": "93f35419eb84d58820040642cb6e7528fe4aba7a"
            },
            {
              "fixed": "4b80b5a838a32437f2cae0662578bac216a2c51a"
            },
            {
              "fixed": "2b884d52273c60c298bd570163e8053657bbaff6"
            },
            {
              "fixed": "bc0fb5c7d54c78be43a536df0e20dee32adb27d3"
            },
            {
              "fixed": "f9fb1a7b635849322e1d7b7b6b26389778ec8e82"
            },
            {
              "fixed": "e049f7a9bd80b7319590789ea5e1c523d6339d91"
            },
            {
              "fixed": "b02da26a992db0c0e2559acbda0fc48d4a2fd337"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.6.0"
            },
            {
              "fixed": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.136"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.83"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.24"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.14"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.20.0"
            },
            {
              "fixed": "7.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31598.json"
  },
  "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 -\u003e ip_alloc_sem):\nocfs2_unlink\n  ocfs2_prepare_orphan_dir\n    ocfs2_lookup_lock_orphan_dir\n      inode_lock(orphan_dir_inode) \u003c- 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(\u0026oi-\u003eip_alloc_sem) \u003c- Lock B\n\nLock Chain #1 (ip_alloc_sem -\u003e orphan dir inode_lock):\nocfs2_dio_end_io_write\n  down_write(\u0026oi-\u003eip_alloc_sem) \u003c- Lock B\n  ocfs2_del_inode_from_orphan()\n    inode_lock(orphan_dir_inode) \u003c- 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.",
  "id": "CVE-2026-31598",
  "modified": "2026-07-15T01:48:57.992915887Z",
  "published": "2026-04-24T14:42:23.304Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/297d8d7bb6a2bf133d3a3636edbdf94101cbd719"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b884d52273c60c298bd570163e8053657bbaff6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/32630dee18c6bb2175c8a865a474749492eaf19c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b80b5a838a32437f2cae0662578bac216a2c51a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/93f35419eb84d58820040642cb6e7528fe4aba7a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b02da26a992db0c0e2559acbda0fc48d4a2fd337"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc0fb5c7d54c78be43a536df0e20dee32adb27d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e049f7a9bd80b7319590789ea5e1c523d6339d91"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9fb1a7b635849322e1d7b7b6b26389778ec8e82"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31598.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31598"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ocfs2: fix possible deadlock between unlink and dio_end_io_write"
}