{ "cveId": "CVE-2026-89491", "url": "https://patchblox.com/security/cve/CVE-2026-89491", "summary": "CVE-2026-89491 is fixed in 47 products on 1 platform, first by DEBIAN-CVE-2026-89491, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: ocfs2: cluster: don\u0027t sleep while holding o2hb_l...", "description": "In the Linux kernel, the following vulnerability has been resolved: ocfs2: cluster: don\u0027t sleep while holding o2hb_live_lock in o2hb_region_pin() Patch series \u0022ocfs2: cluster: o2hb_region_pin() fixes\u0022, v2. This series fixes three related issues in o2hb_region_pin(), all are from the original implementation in commit: 58a3158a5d17 (\u0022ocfs2/cluster: Pin/unpin o2hb regions\u0022): 1) It is called with o2hb_live_lock (a spinlock) held, but the underlying configfs_depend_item() sleeps (takes inode rwsem and pins the filesystem). This triggers BUG under CONFIG_DEBUG_ATOMIC_SLEEP. 2) When called from the configfs drop_item callback, it creates a lock order inversion: parent inode_lock -\u003E configfs root inode_lock, which can deadlock against subsystem unregistration paths taking root -\u003E parent. 3) If pinning fails partway through o2hb_region_inc_user(), the o2hb_dependent_users counter is leaked and partially-pinned regions are never released, leaving heartbeat regions unprotected on subsequent mounts. Patch 1 reworks o2hb_region_pin() to drop o2hb_live_lock across each sleeping configfs_depend_item() call, using a config_item reference to keep the region alive while unlocked. Patch 2 adds a from_callback parameter to select configfs_depend_item_unlocked() when called from configfs context, avoiding the inode_lock nesting. Patch 3 fixes the error path in o2hb_region_inc_user() to unpin and decrement the counter on failure. This patch (of 3): o2hb_region_pin() is always called with the o2hb_live_lock spinlock held (from o2hb_region_inc_user() and o2hb_heartbeat_group_drop_item()), but it calls o2nm_depend_item() -\u003E configfs_depend_item(), which sleeps: it pins the configfs filesystem and takes the configfs root inode rwsem. Under CONFIG_DEBUG_ATOMIC_SLEEP this triggers: BUG: sleeping function called from invalid context at kernel/locking/rwsem.c in_atomic(): 1, ... name: mount.ocfs2 down_write configfs_depend_item o2hb_region_pin o2hb_region_inc_user o2hb_register_callback dlm_register_domain_handlers ... ocfs2_dlm_init ocfs2_mount_volume ocfs2_fill_super Rework o2hb_region_pin() to pin one region at a time with the lock dropped across the sleeping call: under o2hb_live_lock find the next eligible region and take a config_item reference to keep it alive, drop the lock, call o2nm_depend_item(), then retake the lock and record the pin. The config_item_put() is done with the lock released as well, since o2hb_region_release() also acquires o2hb_live_lock and can sleep. The region list may change while unlocked, so the scan restarts from the top after each pin. Local heartbeat still pins only the matching region; global heartbeat pins all eligible regions. The unpin path is unaffected: configfs_undepend_item() only takes a spinlock and does not sleep.", "published": "2026-09-11T20:19:30Z", "severity": "IMPORTANT", "cvss": 5.5, "epss": 0.00216, "epssPercentile": 0.12169, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "kernel-64kb", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-azure", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-default", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": 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