{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/tipc/core.c", "net/tipc/udp_media.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "522d1d950b9e3b68190a6de7534827c8dccedb73", "status": "affected", "version": "04c26faa51d1e2fe71cf13c45791f5174c37f986", "versionType": "git"}, {"lessThan": "c1481c94e74c955e0448ddf46b8615a44d840c1e", "status": "affected", "version": "04c26faa51d1e2fe71cf13c45791f5174c37f986", "versionType": "git"}, {"status": "affected", "version": "d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa", "versionType": "git"}, {"status": "affected", "version": "5195ec5e365a2a9331bfeb585b613a6e94f98dba", "versionType": "git"}, {"status": "affected", "version": "b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d", "versionType": "git"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.124", "versionType": "semver"}, {"lessThan": "5.11", "status": "affected", "version": "5.10.42", "versionType": "semver"}, {"lessThan": "5.13", "status": "affected", "version": "5.12.9", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/tipc/core.c", "net/tipc/udp_media.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.13"}, {"lessThan": "5.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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\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."}], "id": "CVE-2026-80866", "lastModified": "2026-09-04T17:16:58.390", "metrics": {}, "published": "2026-09-04T17:16:58.390", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/522d1d950b9e3b68190a6de7534827c8dccedb73"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c1481c94e74c955e0448ddf46b8615a44d840c1e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}