{"id":"CVE-2026-31598","revision":"4a80e17a4fb84073ba3aff6a1eb2c1fb","records":[{"revision":"4a80e17a4fb84073ba3aff6a1eb2c1fb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-31598","aliases":[],"title":"ocfs2: fix possible deadlock between unlink and dio_end_io_write","description":"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.","state":0,"publishedAt":"2026-04-24T14:42:23.304+00:00","modifiedAt":"2026-10-19T18:55:59.744+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/ocfs2/aops.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"a86a72a4a4e0ec109a98e2737948864ed6794bf7\",\n                            \"lessThan\": \"297d8d7bb6a2bf133d3a3636edbdf94101cbd719\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a86a72a4a4e0ec109a98e2737948864ed6794bf7\",\n                            \"lessThan\": \"32630dee18c6bb2175c8a865a474749492eaf19c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a86a72a4a4e0ec109a98e2737948864ed6794bf7\",\n                            \"lessThan\": \"93f35419eb84d58820040642cb6e7528fe4aba7a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a86a72a4a4e0ec109a98e2737948864ed6794bf7\",\n                            \"lessThan\": \"4b80b5a838a32437f2cae0662578bac216a2c51a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a86a72a4a4e0ec109a98e2737948864ed6794bf7\",\n                            \"lessThan\": \"2b884d52273c60c298bd570163e8053657bbaff6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a86a72a4a4e0ec109a98e2737948864ed6794bf7\",\n                            \"lessThan\": \"bc0fb5c7d54c78be43a536df0e20dee32adb27d3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a86a72a4a4e0ec109a98e2737948864ed6794bf7\",\n                            \"lessThan\": \"f9fb1a7b635849322e1d7b7b6b26389778ec8e82\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a86a72a4a4e0ec109a98e2737948864ed6794bf7\",\n                            \"lessThan\": \"e049f7a9bd80b7319590789ea5e1c523d6339d91\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a86a72a4a4e0ec109a98e2737948864ed6794bf7\",\n                            \"lessThan\": \"b02da26a992db0c0e2559acbda0fc48d4a2fd337\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/ocfs2/aops.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.258\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.209\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.136\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.83\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.24\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.14\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.1\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/297d8d7bb6a2bf133d3a3636edbdf94101cbd719","https://git.kernel.org/stable/c/32630dee18c6bb2175c8a865a474749492eaf19c","https://git.kernel.org/stable/c/93f35419eb84d58820040642cb6e7528fe4aba7a","https://git.kernel.org/stable/c/4b80b5a838a32437f2cae0662578bac216a2c51a","https://git.kernel.org/stable/c/2b884d52273c60c298bd570163e8053657bbaff6","https://git.kernel.org/stable/c/bc0fb5c7d54c78be43a536df0e20dee32adb27d3","https://git.kernel.org/stable/c/f9fb1a7b635849322e1d7b7b6b26389778ec8e82","https://git.kernel.org/stable/c/e049f7a9bd80b7319590789ea5e1c523d6339d91","https://git.kernel.org/stable/c/b02da26a992db0c0e2559acbda0fc48d4a2fd337"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31598","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-31598","identifiers":["CVE-2026-31598"]},"retained":false,"historicalAffected":[]}],"coverage":[]}