{"id":"CVE-2026-80866","summary":"tipc: avoid busy looping in tipc_exit_net()","details":"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(&tn-\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.","modified":"2026-09-06T03:47:13.529020902Z","published":"2026-09-04T16:48:11.682Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80866.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/522d1d950b9e3b68190a6de7534827c8dccedb73"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c1481c94e74c955e0448ddf46b8615a44d840c1e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80866.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80866"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"04c26faa51d1e2fe71cf13c45791f5174c37f986"},{"fixed":"522d1d950b9e3b68190a6de7534827c8dccedb73"},{"fixed":"c1481c94e74c955e0448ddf46b8615a44d840c1e"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa"},{"last_affected":"5195ec5e365a2a9331bfeb585b613a6e94f98dba"},{"last_affected":"b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.124"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.42"},{"fixed":"5.11"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.12.9"},{"fixed":"5.13"}]}],"versions":["v5.12.8","v5.10.41","v5.4.123","v5.12.7","v5.10.40","v5.4.122","v5.12.6","v5.10.39","v5.4.121","v5.12","v5.12.5","v5.10.38","v5.4.120","v5.12.4","v5.10.37","v5.4.119","v5.12.3","v5.10.36","v5.4.118","v5.12.2","v5.10.35","v5.4.117","v5.12.1","v5.10.34","v5.4.116","v5.12-rc2","v5.12-rc1-dontuse","v5.12-rc1","v5.10.33","v5.4.115","v5.10.32","v5.4.114","v5.12-rc8","v5.12-rc3","v5.10.31","v5.4.113","v5.12-rc7","v5.12-rc5","v5.4.112","v5.10.30","v5.12-rc6","v5.10.29","v5.4.111","v5.10.28","v5.4.110","v5.10.27","v5.4.109","v5.12-rc4","v5.10","v5.4.108","v5.10.26","v5.10.25","v5.11","v5.4.107","v5.10.24","v5.4.106","v5.10.23","v5.4.105","v5.10.22","v5.4.104","v5.10.21","v5.4.103","v5.10.20","v5.4.102","v5.10.19","v5.4.101","v5.10.18","v5.4.100","v5.11-rc3","v5.10.17","v5.4.99","v5.11-rc7","v5.11-rc6","v5.10.16","v5.4.98","v5.11-rc5","v5.11-rc1","v5.10.15","v5.4.97","v5.11-rc4","v5.10.14","v5.4.96","v5.11-rc2","v5.10.13","v5.4.95","v5.10.12","v5.4.94","v5.10.11","v5.4.93","v5.10.10","v5.4.92","v5.10.9","v5.4.91","v5.10-rc1","v5.10.8","v5.4.90","v5.10.7","v5.4.89","v5.10.6","v5.4.88","v5.10.5","v5.4.87","v5.10.4","v5.4.86","v5.10.3","v5.4.85","v5.10.2","v5.10.1","v5.4.84","v5.10-rc7","v5.4.83","v5.10-rc4","v5.10-rc3","v5.10-rc6","v5.9","v5.4.82","v5.10-rc2","v5.10-rc5","v5.4.81","v5.4.80","v5.4.79","v5.4.78","v5.4.77","v5.4.76","v5.4.75","v5.4.74","v5.4.73","v5.4.72","v5.9-rc1","v5.9-rc7","v5.4.71","v5.4.70","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.4.69","v5.9-rc3","v5.4.68","v5.4.67","v5.9-rc2","v5.4.66","v5.4.65","v5.4.64","v5.4.63","v5.4.62","v5.8","v5.4.61","v5.4.60","v5.4.59","v5.4.58","v5.4.57","v5.4.56","v5.7","v5.8-rc2","v5.8-rc1","v5.8-rc7","v5.4.55","v5.8-rc5","v5.4.54","v5.8-rc3","v5.8-rc4","v5.4.53","v5.8-rc6","v5.4.52","v5.4.51","v5.4.50","v5.4.49","v5.7-rc4","v5.4.48","v5.4.47","v5.4.46","v5.4.45","v5.4.44","v5.7-rc7","v5.7-rc1","v5.4.43","v5.7-rc3","v5.7-rc2","v5.7-rc5","v5.4.42","v5.7-rc6","v5.4.41","v5.4.40","v5.6","v5.4.39","v5.4.38","v5.4.37","v5.4.36","v5.4.35","v5.4.34","v5.4.33","v5.4.32","v5.4.31","v5.4.30","v5.6-rc1","v5.4.29","v5.4.28","v5.6-rc7","v5.6-rc6","v5.6-rc3","v5.6-rc4","v5.6-rc2","v5.6-rc5","v5.4.27","v5.4.26","v5.4.25","v5.4.24","v5.4.23","v5.4.22","v5.4.21","v5.4.20","v5.4.19","v5.4.18","v5.5","v5.4.17","v5.5-rc5","v5.4.16","v5.5-rc7","v5.5-rc2","v5.5-rc1","v5.4.15","v5.4","v5.4.14","v5.5-rc4","v5.4.13","v5.5-rc3","v5.5-rc6","v5.4.12","v5.4.11","v5.4.10","v5.4.9","v5.4.8","v5.4.7","v5.4.6","v5.4.5","v5.4.4","v5.4.3","v5.4.2","v5.4-rc1","v5.4.1","v5.4-rc6","v5.4-rc3","v5.4-rc4","v5.4-rc8","v5.4-rc7","v5.4-rc5","v5.3","v5.4-rc2","v5.3-rc5","v5.3-rc1","v5.3-rc2","v5.3-rc3","v5.3-rc8","v5.3-rc7","v5.3-rc4","v5.2","v5.3-rc6","v5.2-rc2","v5.2-rc7","v5.2-rc4","v5.2-rc1","v5.2-rc5","v5.2-rc6","v5.2-rc3","v5.1","v5.0-rc8","v5.1-rc7","v5.1-rc1","v5.1-rc6","v5.1-rc5","v5.0","v5.1-rc3","v5.1-rc2","v5.1-rc4","v5.0-rc1","v5.0-rc4","v5.0-rc3","v5.0-rc6","v5.0-rc7","v5.0-rc2","v5.0-rc5","v4.20-rc1","v4.19","v4.20","v4.20-rc7","v4.20-rc5","v4.20-rc6","v4.20-rc4","v4.20-rc2","v4.20-rc3","v4.19-rc2","v4.19-rc8","v4.19-rc4","v4.19-rc1","v4.19-rc7","v4.19-rc6","v4.19-rc5","v4.19-rc3","v4.18","v4.18-rc1","v4.18-rc8","v4.18-rc2","v4.18-rc5","v4.18-rc6","v4.18-rc7","v4.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