{ "cveId": "CVE-2026-90302", "url": "https://patchblox.com/security/cve/CVE-2026-90302", "summary": "CVE-2026-90302 is fixed in 37 products on 1 platform, first by DEBIAN-CVE-2026-90302, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "ocfs2: synchronize heartbeat callbacks with o2net teardown", "description": "In the Linux kernel, the following vulnerability has been resolved: ocfs2: synchronize heartbeat callbacks with o2net teardown Patch series \u0022ocfs2: harden heartbeat teardown races\u0022. This series fixes two OCFS2 heartbeat/o2net teardown races found by KASAN. This patch (of 2): Heartbeat callbacks stay registered while configfs local-node teardown enters o2net_stop_listening(). A node-down event can still run through o2net_disconnect_node() and o2net_set_nn_state() while teardown is destroying o2net_wq, so the later queue/flush operations can hit a dead workqueue. KASAN has caught this as a slab-use-after-free in __queue_work() with the call chain: KASAN slab-use-after-free in __queue_work\u002B0x56/0xa90 Read of size 4 Call trace: dump_stack_lvl\u002B0x66/0xa0 print_report\u002B0xce/0x630 __queue_work\u002B0x56/0xa90 srso_alias_return_thunk\u002B0x5/0xfbef5 __virt_addr_valid\u002B0x19f/0x330 kasan_report\u002B0xe0/0x110 __queue_delayed_work\u002B0x58/0x1e0 queue_delayed_work_on\u002B0xb4/0xc0 o2net_set_nn_state\u002B0x467/0x840 o2net_disconnect_node\u002B0x7b/0xe0 o2net_hb_node_down_cb\u002B0x54/0x60 o2hb_run_event_list\u002B0x236/0x2d0 o2hb_check_slot\u002B0xad4/0xbc0 lock_release\u002B0xc8/0x290 o2hb_check_slot\u002B0x9ea/0xbc0 trace_hardirqs_on\u002B0x18/0x130 o2hb_do_disk_heartbeat\u002B0x646/0xb30 (fs/ocfs2/cluster/heartbeat.c:1079) __lock_acquire\u002B0x466/0x2260 lockdep_hardirqs_on_prepare\u002B0xea/0x1a0 ktime_get_with_offset\u002B0xe9/0x230 o2hb_thread\u002B0x14e/0x770 kthread\u002B0x1ad/0x1f0 ret_from_fork\u002B0x3c9/0x540 __switch_to\u002B0x2e9/0x730 ret_from_fork_asm\u002B0x1a/0x30 Allocated by task stack: kasan_save_stack\u002B0x33/0x60 kasan_save_track\u002B0x14/0x30 __kasan_kmalloc\u002B0xaa/0xb0 __kmalloc_noprof\u002B0x292/0x760 __alloc_workqueue\u002B0x736/0xc60 alloc_workqueue_noprof\u002B0xb1/0x110 o2net_start_listening\u002B0xe5/0x430 o2nm_node_local_store\u002B0x184/0x310 configfs_write_iter\u002B0x18a/0x210 vfs_write\u002B0x469/0x810 ksys_write\u002B0xd2/0x170 do_syscall_64\u002B0x115/0x6a0 (arch/x86/entry/syscall_64.c:87) entry_SYSCALL_64_after_hwframe\u002B0x77/0x7f Freed by task stack: kasan_save_stack\u002B0x33/0x60 kasan_save_track\u002B0x14/0x30 kasan_save_free_info\u002B0x3b/0x60 __kasan_slab_free\u002B0x5f/0x80 kfree\u002B0x313/0x590 rcu_core\u002B0x4f4/0x1320 handle_softirqs\u002B0x156/0x660 queue_delayed_work_on o2net_set_nn_state o2net_disconnect_node o2net_hb_node_down_cb o2hb_run_event_list Keep heartbeat callbacks registered so quorum state still tracks node state, but stop them from driving o2net reconnect/disconnect work once local teardown starts. Mark the transport offline before destroying o2net_wq, wait for any in-flight heartbeat callback to finish, and delay bring-up replay until the new local node is published through o2nm_this_node(). The replay also has to stay serialized with heartbeat callback delivery. Otherwise a live-node snapshot can be copied, a real hb_down callback can install -ENOTCONN for a peer, and the stale replay can call o2net_hb_node_up() for that same peer and queue reconnect work even though heartbeat is already down. The buggy scenario involves two paths, with each column showing the order within that path: local-node teardown: heartbeat node-down callback: 1. configfs local-off enters 1. o2hb_run_event_list() invokes o2net_stop_listening(). o2net_hb_node_down_cb(). 2. teardown heads for 2. the callback reaches destroy_workqueue(o2net_wq). o2net_disconnect_node() and o2net_set_nn_state(). 3. teardown destroys and NULLs 3. the callback flushes or queues o2net_wq. work through o2net_wq.", "published": "2026-09-17T17:17:27Z", "severity": "Important", "cvss": 7.8, "epss": 0.00216, "epssPercentile": 0.12127, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90302", "fixes": [ { "platform": "linux", "product": "kernel-uek", "release": "ol 10", "fixedVersion": "0:6.12.0-207.111.5.1.el9uek", "fix": "ELSA-2026-500374", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500374", "released": "2026-10-07T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek", "release": "ol 9", "fixedVersion": "0:6.12.0-207.111.5.1.el9uek", "fix": "ELSA-2026-500374", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500374", "released": "2026-10-07T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-core", "release": "ol 10", "fixedVersion": "0:6.12.0-207.111.5.1.el9uek", "fix": "ELSA-2026-500374", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500374", "released": "2026-10-07T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-core", "release": "ol 9", "fixedVersion": "0:6.12.0-207.111.5.1.el9uek", "fix": "ELSA-2026-500374", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500374", "released": "2026-10-07T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug", "release": "ol 10", "fixedVersion": "0:6.12.0-207.111.5.1.el9uek", "fix": "ELSA-2026-500374", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500374", "released": "2026-10-07T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug", "release": "ol 9", "fixedVersion": "0:6.12.0-207.111.5.1.el9uek", "fix": "ELSA-2026-500374", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500374", "released": "2026-10-07T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug-core", "release": "ol 10", "fixedVersion": "0:6.12.0-207.111.5.1.el9uek", "fix": "ELSA-2026-500374", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500374", "released": "2026-10-07T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug-core", "release": "ol 9", "fixedVersion": "0:6.12.0-207.111.5.1.el9uek", "fix": "ELSA-2026-500374", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500374", "released": "2026-10-07T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug-devel", "release": "ol 10", "fixedVersion": 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