{"id":"CVE-2026-99054","revision":"54ee94a409dd4d5c8583ff19660e9419","records":[{"revision":"54ee94a409dd4d5c8583ff19660e9419","observedAt":"2026-10-24T16:17:04.479+00:00","statement":{"source":"cve-program","id":"CVE-2026-99054","aliases":[],"title":"tipc: destroy topsrv workqueues before closing connections","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: destroy topsrv workqueues before closing connections\n\ntipc_topsrv_stop() closed subscriber connections while the topology\nserver's send and receive workqueues were still running. Socket\ncallbacks and subscription events could then queue more work, and\nin-flight send/recv work could drop the last connection reference\nduring the conn_idr walk.\n\nThat race produced several teardown failures: refcount_t addition on\n0 from conn_get() on a connection whose release was blocked on\nidr_lock, a subsequent use-after-free in tipc_conn_close(),\nqueue_work() on an already destroyed workqueue from the listener\ndata-ready callback, and an RCU stall in tipc_topsrv_exit_net()\nwhile the walk spun under idr_lock.\n\nClear srv->listener under idr_lock so it acts as a shutdown flag,\nskip queue_work() once it is NULL, destroy the workqueues to flush\nin-flight work, and only then close the remaining connections.\nRefuse tipc_conn_lookup() after that flag is cleared, and drop\nidr_lock when the teardown walk finds no connection, so an\nin-flight subscription event cannot pin idr_in_use while the\nwalk holds the lock.\n\nv3 supersedes the narrower in-thread diff Tung Quang Nguyen\nposted on 2026-09-23. It keeps his teardown order and adds the\nlookup refusal and the empty-idr unlock.","state":0,"publishedAt":"2026-10-23T12:22:36.886+00:00","modifiedAt":"2026-10-24T14:10:14.659+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/tipc/topsrv.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f\",\n                            \"lessThan\": \"7f796bb3b440d7f1b14c0e3b520462eb34f553af\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f\",\n                            \"lessThan\": \"da9c16568bc79140a54c1f5fcf07a0305df47b37\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f\",\n                            \"lessThan\": \"0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f\",\n                            \"lessThan\": \"fb717c536af2aafeca520ff11d1e0f25f7ab8fa9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f\",\n                            \"lessThan\": \"3acdd44385bc7e2e57605e073691ce69cc5a960d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/tipc/topsrv.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.11\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.160\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.113\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.57\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.11\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/7f796bb3b440d7f1b14c0e3b520462eb34f553af","https://git.kernel.org/stable/c/da9c16568bc79140a54c1f5fcf07a0305df47b37","https://git.kernel.org/stable/c/0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e","https://git.kernel.org/stable/c/fb717c536af2aafeca520ff11d1e0f25f7ab8fa9","https://git.kernel.org/stable/c/3acdd44385bc7e2e57605e073691ce69cc5a960d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99054","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99054","identifiers":["CVE-2026-99054"]},"retained":false,"historicalAffected":[]}],"coverage":[]}