{"id":"CVE-2026-89491","revision":"0ac92b6613044081a7f84b882554c41d","records":[{"revision":"0ac92b6613044081a7f84b882554c41d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89491","aliases":[],"title":"ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()\n\nPatch series \"ocfs2: cluster: o2hb_region_pin() fixes\", v2.\n\nThis series fixes three related issues in o2hb_region_pin(), all are from\nthe original implementation in commit: 58a3158a5d17 (\"ocfs2/cluster:\nPin/unpin o2hb regions\"):\n\n1) It is called with o2hb_live_lock (a spinlock) held, but the\n   underlying configfs_depend_item() sleeps (takes inode rwsem and\n   pins the filesystem).  This triggers BUG under\n   CONFIG_DEBUG_ATOMIC_SLEEP.\n\n2) When called from the configfs drop_item callback, it creates a\n   lock order inversion: parent inode_lock -> configfs root\n   inode_lock, which can deadlock against subsystem unregistration\n   paths taking root -> parent.\n\n3) If pinning fails partway through o2hb_region_inc_user(), the\n   o2hb_dependent_users counter is leaked and partially-pinned\n   regions are never released, leaving heartbeat regions\n   unprotected on subsequent mounts.\n\nPatch 1 reworks o2hb_region_pin() to drop o2hb_live_lock across each\nsleeping configfs_depend_item() call, using a config_item reference to\nkeep the region alive while unlocked.\n\nPatch 2 adds a from_callback parameter to select\nconfigfs_depend_item_unlocked() when called from configfs context,\navoiding the inode_lock nesting.\n\nPatch 3 fixes the error path in o2hb_region_inc_user() to unpin and\ndecrement the counter on failure.\n\n\nThis patch (of 3):\n\no2hb_region_pin() is always called with the o2hb_live_lock spinlock held\n(from o2hb_region_inc_user() and o2hb_heartbeat_group_drop_item()), but it\ncalls o2nm_depend_item() -> configfs_depend_item(), which sleeps: it pins\nthe configfs filesystem and takes the configfs root inode rwsem.  Under\nCONFIG_DEBUG_ATOMIC_SLEEP this triggers:\n\n  BUG: sleeping function called from invalid context at kernel/locking/rwsem.c\n  in_atomic(): 1, ... name: mount.ocfs2\n    down_write\n    configfs_depend_item\n    o2hb_region_pin\n    o2hb_region_inc_user\n    o2hb_register_callback\n    dlm_register_domain_handlers\n    ...\n    ocfs2_dlm_init\n    ocfs2_mount_volume\n    ocfs2_fill_super\n\nRework o2hb_region_pin() to pin one region at a time with the lock dropped\nacross the sleeping call: under o2hb_live_lock find the next eligible\nregion and take a config_item reference to keep it alive, drop the lock,\ncall o2nm_depend_item(), then retake the lock and record the pin.  The\nconfig_item_put() is done with the lock released as well, since\no2hb_region_release() also acquires o2hb_live_lock and can sleep.  The\nregion list may change while unlocked, so the scan restarts from the top\nafter each pin.  Local heartbeat still pins only the matching region;\nglobal heartbeat pins all eligible regions.\n\nThe unpin path is unaffected: configfs_undepend_item() only takes a\nspinlock and does not sleep.","state":0,"publishedAt":"2026-09-11T19:43:43.466+00:00","modifiedAt":"2026-10-19T08:47:43+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/cluster/heartbeat.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\n                            \"lessThan\": \"4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\n                            \"lessThan\": \"3b790774280a610f8bdbd5d4260a07345bcf8e04\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\n                            \"lessThan\": \"0cbc2f20a6ea7b4a59efa9171b7c694cdd196507\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\n                            \"lessThan\": \"c9be4de77f97f383b750698e1517fd296041f4bb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\n                            \"lessThan\": \"49002acc520c61002ad195894ac391c94317d3ba\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\n                            \"lessThan\": \"ce035f208d68b812d83e5482980f2b1c88a9cd94\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\n                            \"lessThan\": \"470212a5eefabcc16b8e2f7fe2844b8737fe571c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\n                            \"lessThan\": \"af09df89db9a68a1d76df0f75667998135bc8d65\",\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/cluster/heartbeat.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.38\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.38\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03","https://git.kernel.org/stable/c/3b790774280a610f8bdbd5d4260a07345bcf8e04","https://git.kernel.org/stable/c/0cbc2f20a6ea7b4a59efa9171b7c694cdd196507","https://git.kernel.org/stable/c/c9be4de77f97f383b750698e1517fd296041f4bb","https://git.kernel.org/stable/c/49002acc520c61002ad195894ac391c94317d3ba","https://git.kernel.org/stable/c/ce035f208d68b812d83e5482980f2b1c88a9cd94","https://git.kernel.org/stable/c/470212a5eefabcc16b8e2f7fe2844b8737fe571c","https://git.kernel.org/stable/c/af09df89db9a68a1d76df0f75667998135bc8d65"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89491","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89491","identifiers":["CVE-2026-89491"]},"retained":false,"historicalAffected":[]}],"coverage":[]}