CVE-2026-80866 (GCVE-0-2026-80866)
Vulnerability from cvelistv5
Published
2026-09-04 16:48
Modified
2026-10-30 12:31
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tipc: avoid busy looping in tipc_exit_net() Blamed commit introduced a busy-wait loop in tipc_exit_net() to wait for pending UDP bearer cleanup works to complete: while (atomic_read(&tn->wq_count)) cond_resched(); This loop can busy-wait for a long time if cond_resched() is a NOP. This typically happens if the netns exit is executed by a high priority task, or under kernels configured without preemption (CONFIG_PREEMPT_NONE). In such cases, it wastes CPU cycles and can lead to soft lockups. Fix this by replacing the busy loop with wait_var_event(), allowing the thread to sleep properly until the work queue count reaches zero. Accordingly, update cleanup_bearer() to use atomic_dec_and_test() and wake_up_var() to wake up the waiter when the count drops to zero. This uses the global wait queue hash table, avoiding the need to bloat struct tipc_net with a wait_queue_head_t. The atomic_dec_and_test() provides the necessary memory barrier to ensure the wakeup is not missed.
References
Impacted products
Vendor Product Version
Linux Linux Version: 04c26faa51d1e2fe71cf13c45791f5174c37f986
Version: 04c26faa51d1e2fe71cf13c45791f5174c37f986
Version: 04c26faa51d1e2fe71cf13c45791f5174c37f986
Version: 04c26faa51d1e2fe71cf13c45791f5174c37f986
Version: 04c26faa51d1e2fe71cf13c45791f5174c37f986
Version: 04c26faa51d1e2fe71cf13c45791f5174c37f986
Version: d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa
Version: 5195ec5e365a2a9331bfeb585b613a6e94f98dba
Version: b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d
Version: 5.4.124   ≤
Version: 5.10.42   ≤
Version: 5.12.9   ≤
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{
  "containers": {
    "cna": {
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          "programFiles": [
            "net/tipc/core.c",
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          "vendor": "Linux",
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      "cpeApplicability": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: avoid busy looping in tipc_exit_net()\n\nBlamed commit introduced a busy-wait loop in tipc_exit_net()\nto wait for pending UDP bearer cleanup works to complete:\n\n       while (atomic_read(\u0026tn-\u003ewq_count))\n               cond_resched();\n\nThis loop can busy-wait for a long time if cond_resched() is a NOP. This\ntypically happens if the netns exit is executed by a high priority task,\nor under kernels configured without preemption (CONFIG_PREEMPT_NONE). In\nsuch cases, it wastes CPU cycles and can lead to soft lockups.\n\nFix this by replacing the busy loop with wait_var_event(), allowing the\nthread to sleep properly until the work queue count reaches zero.\n\nAccordingly, update cleanup_bearer() to use atomic_dec_and_test() and\nwake_up_var() to wake up the waiter when the count drops to zero.\n\nThis uses the global wait queue hash table, avoiding the need to bloat\nstruct tipc_net with a wait_queue_head_t. The atomic_dec_and_test()\nprovides the necessary memory barrier to ensure the wakeup is not missed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:31:21.261Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/772769859226a5b004442403510acb58a1c32e72"
        },
        {
          "url": "https://git.kernel.org/stable/c/99b82c8452887408ea908fdfa5df33c4a5dfa88f"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/c1481c94e74c955e0448ddf46b8615a44d840c1e"
        }
      ],
      "title": "tipc: avoid busy looping in tipc_exit_net()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80866",
    "datePublished": "2026-09-04T16:48:11.682Z",
    "dateReserved": "2026-08-26T14:34:25.798Z",
    "dateUpdated": "2026-10-30T12:31:21.261Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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