{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80866","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-26T14:34:25.798Z","datePublished":"2026-09-04T16:48:11.682Z","dateUpdated":"2026-09-04T16:48:11.682Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-04T16:48:11.682Z"},"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(&tn->wq_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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/tipc/core.c","net/tipc/udp_media.c"],"versions":[{"version":"04c26faa51d1e2fe71cf13c45791f5174c37f986","lessThan":"522d1d950b9e3b68190a6de7534827c8dccedb73","status":"affected","versionType":"git"},{"version":"04c26faa51d1e2fe71cf13c45791f5174c37f986","lessThan":"c1481c94e74c955e0448ddf46b8615a44d840c1e","status":"affected","versionType":"git"},{"version":"d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa","status":"affected","versionType":"git"},{"version":"5195ec5e365a2a9331bfeb585b613a6e94f98dba","status":"affected","versionType":"git"},{"version":"b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d","status":"affected","versionType":"git"},{"version":"5.4.124","lessThan":"5.5","status":"affected","versionType":"semver"},{"version":"5.10.42","lessThan":"5.11","status":"affected","versionType":"semver"},{"version":"5.12.9","lessThan":"5.13","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/tipc/core.c","net/tipc/udp_media.c"],"versions":[{"version":"5.13","status":"affected"},{"version":"0","lessThan":"5.13","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.124"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12.9"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/522d1d950b9e3b68190a6de7534827c8dccedb73"},{"url":"https://git.kernel.org/stable/c/c1481c94e74c955e0448ddf46b8615a44d840c1e"}],"title":"tipc: avoid busy looping in tipc_exit_net()","x_generator":{"engine":"bippy-1.2.0"}}}}