{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-90302", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-90302", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-17T16:08:25.808Z", "updatedAt": "2026-10-19T09:01:20.232Z", "importedAt": "2026-10-24T01:58:35.090Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "ocfs2: synchronize heartbeat callbacks with o2net teardown", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: synchronize heartbeat callbacks with o2net teardown\n\nPatch series \"ocfs2: harden heartbeat teardown races\".\n\nThis series fixes two OCFS2 heartbeat/o2net teardown races found by\nKASAN.\n\n\nThis patch (of 2):\n\nHeartbeat callbacks stay registered while configfs local-node teardown\nenters o2net_stop_listening(). A node-down event can still run through\no2net_disconnect_node() and o2net_set_nn_state() while teardown is\ndestroying o2net_wq, so the later queue/flush operations can hit a dead\nworkqueue. KASAN has caught this as a slab-use-after-free in\n__queue_work() with the call chain:\n\nKASAN slab-use-after-free in __queue_work+0x56/0xa90\nRead of size 4\nCall trace:\n dump_stack_lvl+0x66/0xa0\n print_report+0xce/0x630\n __queue_work+0x56/0xa90\n srso_alias_return_thunk+0x5/0xfbef5\n __virt_addr_valid+0x19f/0x330\n kasan_report+0xe0/0x110\n __queue_delayed_work+0x58/0x1e0\n queue_delayed_work_on+0xb4/0xc0\n o2net_set_nn_state+0x467/0x840\n o2net_disconnect_node+0x7b/0xe0\n o2net_hb_node_down_cb+0x54/0x60\n o2hb_run_event_list+0x236/0x2d0\n o2hb_check_slot+0xad4/0xbc0\n lock_release+0xc8/0x290\n o2hb_check_slot+0x9ea/0xbc0\n trace_hardirqs_on+0x18/0x130\n o2hb_do_disk_heartbeat+0x646/0xb30 (fs/ocfs2/cluster/heartbeat.c:1079)\n __lock_acquire+0x466/0x2260\n lockdep_hardirqs_on_prepare+0xea/0x1a0\n ktime_get_with_offset+0xe9/0x230\n o2hb_thread+0x14e/0x770\n kthread+0x1ad/0x1f0\n ret_from_fork+0x3c9/0x540\n __switch_to+0x2e9/0x730\n ret_from_fork_asm+0x1a/0x30\nAllocated by task stack:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0xaa/0xb0\n __kmalloc_noprof+0x292/0x760\n __alloc_workqueue+0x736/0xc60\n alloc_workqueue_noprof+0xb1/0x110\n o2net_start_listening+0xe5/0x430\n o2nm_node_local_store+0x184/0x310\n configfs_write_iter+0x18a/0x210\n vfs_write+0x469/0x810\n ksys_write+0xd2/0x170\n do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nFreed by task stack:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x60\n __kasan_slab_free+0x5f/0x80\n kfree+0x313/0x590\n rcu_core+0x4f4/0x1320\n handle_softirqs+0x156/0x660\n\nqueue_delayed_work_on\no2net_set_nn_state\no2net_disconnect_node\no2net_hb_node_down_cb\no2hb_run_event_list\n\nKeep heartbeat callbacks registered so quorum state still tracks node\nstate, but stop them from driving o2net reconnect/disconnect work once\nlocal teardown starts. Mark the transport offline before destroying\no2net_wq, wait for any in-flight heartbeat callback to finish, and delay\nbring-up replay until the new local node is published through\no2nm_this_node().\n\nThe replay also has to stay serialized with heartbeat callback delivery.\nOtherwise a live-node snapshot can be copied, a real hb_down callback\ncan install -ENOTCONN for a peer, and the stale replay can call\no2net_hb_node_up() for that same peer and queue reconnect work even\nthough heartbeat is already down.\n\nThe buggy scenario involves two paths, with each column showing the order\nwithin that path:\n\nlocal-node teardown: heartbeat node-down callback:\n1. configfs local-off enters 1. o2hb_run_event_list() invokes\n o2net_stop_listening(). o2net_hb_node_down_cb().\n2. teardown heads for 2. the callback reaches\n destroy_workqueue(o2net_wq). o2net_disconnect_node() and\n o2net_set_nn_state().\n3. teardown destroys and NULLs 3. the callback flushes or queues\n o2net_wq. work through o2net_wq.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "98211489d4147e41b11703e4245846d60b3acce4", "status": "affected", "versionType": "git", "lessThan": "7601db4c9d3bd9ab2482a863cb05204154d51ae8" }, { "version": "98211489d4147e41b11703e4245846d60b3acce4", "status": "affected", "versionType": "git", "lessThan": "fb61882e184ee5ca745806bc5b2a8483fa129bca" }, { "version": "98211489d4147e41b11703e4245846d60b3acce4", "status": "affected", "versionType": "git", "lessThan": "a03078a9a2a1c5e4a62f65d389c1f75f9898e21d" }, { "version": "98211489d4147e41b11703e4245846d60b3acce4", "status": "affected", "versionType": "git", "lessThan": "cbb4efc2f99d6a8dba09c96b10acad82da982cf9" }, { "version": "98211489d4147e41b11703e4245846d60b3acce4", "status": "affected", "versionType": "git", "lessThan": "8f96b78314cff0778a3466e49e5edbc1e459c95c" }, { "version": "98211489d4147e41b11703e4245846d60b3acce4", "status": "affected", "versionType": "git", "lessThan": "aee687a2fb36974dc37e4e0f5b03802067c6c4ec" }, { "version": "98211489d4147e41b11703e4245846d60b3acce4", "status": "affected", "versionType": "git", "lessThan": "073f51e39bed354452a057d38a4cc3952727c304" }, { "version": "98211489d4147e41b11703e4245846d60b3acce4", "status": "affected", "versionType": "git", "lessThan": "3e326f3bf16506873777444608e8b715aab74a7a" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.16", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.16" }, { "version": "5.10.270", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.221", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.188", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.157", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.110", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.52", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }