FKIE_CVE-2026-90302

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-17 17:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: synchronize heartbeat callbacks with o2net teardown Patch series "ocfs2: harden heartbeat teardown races". 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+0x56/0xa90 Read of size 4 Call trace: dump_stack_lvl+0x66/0xa0 print_report+0xce/0x630 __queue_work+0x56/0xa90 srso_alias_return_thunk+0x5/0xfbef5 __virt_addr_valid+0x19f/0x330 kasan_report+0xe0/0x110 __queue_delayed_work+0x58/0x1e0 queue_delayed_work_on+0xb4/0xc0 o2net_set_nn_state+0x467/0x840 o2net_disconnect_node+0x7b/0xe0 o2net_hb_node_down_cb+0x54/0x60 o2hb_run_event_list+0x236/0x2d0 o2hb_check_slot+0xad4/0xbc0 lock_release+0xc8/0x290 o2hb_check_slot+0x9ea/0xbc0 trace_hardirqs_on+0x18/0x130 o2hb_do_disk_heartbeat+0x646/0xb30 (fs/ocfs2/cluster/heartbeat.c:1079) __lock_acquire+0x466/0x2260 lockdep_hardirqs_on_prepare+0xea/0x1a0 ktime_get_with_offset+0xe9/0x230 o2hb_thread+0x14e/0x770 kthread+0x1ad/0x1f0 ret_from_fork+0x3c9/0x540 __switch_to+0x2e9/0x730 ret_from_fork_asm+0x1a/0x30 Allocated by task stack: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 __kasan_kmalloc+0xaa/0xb0 __kmalloc_noprof+0x292/0x760 __alloc_workqueue+0x736/0xc60 alloc_workqueue_noprof+0xb1/0x110 o2net_start_listening+0xe5/0x430 o2nm_node_local_store+0x184/0x310 configfs_write_iter+0x18a/0x210 vfs_write+0x469/0x810 ksys_write+0xd2/0x170 do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87) entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task stack: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3b/0x60 __kasan_slab_free+0x5f/0x80 kfree+0x313/0x590 rcu_core+0x4f4/0x1320 handle_softirqs+0x156/0x660 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/073f51e39bed354452a057d38a4cc3952727c304
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3e326f3bf16506873777444608e8b715aab74a7a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7601db4c9d3bd9ab2482a863cb05204154d51ae8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8f96b78314cff0778a3466e49e5edbc1e459c95c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a03078a9a2a1c5e4a62f65d389c1f75f9898e21d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aee687a2fb36974dc37e4e0f5b03802067c6c4ec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cbb4efc2f99d6a8dba09c96b10acad82da982cf9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fb61882e184ee5ca745806bc5b2a8483fa129bca
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/cluster/heartbeat.c",
            "fs/ocfs2/cluster/heartbeat.h",
            "fs/ocfs2/cluster/nodemanager.c",
            "fs/ocfs2/cluster/tcp.c",
            "fs/ocfs2/cluster/tcp.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7601db4c9d3bd9ab2482a863cb05204154d51ae8",
              "status": "affected",
              "version": "98211489d4147e41b11703e4245846d60b3acce4",
              "versionType": "git"
            },
            {
              "lessThan": "fb61882e184ee5ca745806bc5b2a8483fa129bca",
              "status": "affected",
              "version": "98211489d4147e41b11703e4245846d60b3acce4",
              "versionType": "git"
            },
            {
              "lessThan": "a03078a9a2a1c5e4a62f65d389c1f75f9898e21d",
              "status": "affected",
              "version": "98211489d4147e41b11703e4245846d60b3acce4",
              "versionType": "git"
            },
            {
              "lessThan": "cbb4efc2f99d6a8dba09c96b10acad82da982cf9",
              "status": "affected",
              "version": "98211489d4147e41b11703e4245846d60b3acce4",
              "versionType": "git"
            },
            {
              "lessThan": "8f96b78314cff0778a3466e49e5edbc1e459c95c",
              "status": "affected",
              "version": "98211489d4147e41b11703e4245846d60b3acce4",
              "versionType": "git"
            },
            {
              "lessThan": "aee687a2fb36974dc37e4e0f5b03802067c6c4ec",
              "status": "affected",
              "version": "98211489d4147e41b11703e4245846d60b3acce4",
              "versionType": "git"
            },
            {
              "lessThan": "073f51e39bed354452a057d38a4cc3952727c304",
              "status": "affected",
              "version": "98211489d4147e41b11703e4245846d60b3acce4",
              "versionType": "git"
            },
            {
              "lessThan": "3e326f3bf16506873777444608e8b715aab74a7a",
              "status": "affected",
              "version": "98211489d4147e41b11703e4245846d60b3acce4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/cluster/heartbeat.c",
            "fs/ocfs2/cluster/heartbeat.h",
            "fs/ocfs2/cluster/nodemanager.c",
            "fs/ocfs2/cluster/tcp.c",
            "fs/ocfs2/cluster/tcp.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.16"
            },
            {
              "lessThan": "2.6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-90302",
  "lastModified": "2026-09-17T17:17:27.723",
  "metrics": {},
  "published": "2026-09-17T17:17:27.723",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/073f51e39bed354452a057d38a4cc3952727c304"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3e326f3bf16506873777444608e8b715aab74a7a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7601db4c9d3bd9ab2482a863cb05204154d51ae8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8f96b78314cff0778a3466e49e5edbc1e459c95c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a03078a9a2a1c5e4a62f65d389c1f75f9898e21d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aee687a2fb36974dc37e4e0f5b03802067c6c4ec"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cbb4efc2f99d6a8dba09c96b10acad82da982cf9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fb61882e184ee5ca745806bc5b2a8483fa129bca"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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