CVE-2021-47163

{"id": "CVE-2021-47163", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-03-25T10:15:08.530", "references": [{"url": "https://git.kernel.org/stable/c/04c26faa51d1e2fe71cf13c45791f5174c37f986", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5195ec5e365a2a9331bfeb585b613a6e94f98dba", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/04c26faa51d1e2fe71cf13c45791f5174c37f986", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/5195ec5e365a2a9331bfeb585b613a6e94f98dba", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-667"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: wait and exit until all work queues are done\n\nOn some host, a crash could be triggered simply by repeating these\ncommands several times:\n\n # modprobe tipc\n # tipc bearer enable media udp name UDP1 localip 127.0.0.1\n # rmmod tipc\n\n [] BUG: unable to handle kernel paging request at ffffffffc096bb00\n [] Workqueue: events 0xffffffffc096bb00\n [] Call Trace:\n [] ? process_one_work+0x1a7/0x360\n [] ? worker_thread+0x30/0x390\n [] ? create_worker+0x1a0/0x1a0\n [] ? kthread+0x116/0x130\n [] ? kthread_flush_work_fn+0x10/0x10\n [] ? ret_from_fork+0x35/0x40\n\nWhen removing the TIPC module, the UDP tunnel sock will be delayed to\nrelease in a work queue as sock_release() can't be done in rtnl_lock().\nIf the work queue is schedule to run after the TIPC module is removed,\nkernel will crash as the work queue function cleanup_beareri() code no\nlonger exists when trying to invoke it.\n\nTo fix it, this patch introduce a member wq_count in tipc_net to track\nthe numbers of work queues in schedule, and wait and exit until all\nwork queues are done in tipc_exit_net()."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tipc: espere y salga hasta que todas las colas de trabajo est\u00e9n terminadas. En algunos hosts, se podr\u00eda desencadenar un bloqueo simplemente repitiendo estos comandos varias veces: # modprobe tipc # tipc portador habilitar media udp nombre UDP1 localip 127.0.0.1 # rmmod tipc [] ERROR: no se puede manejar la solicitud de paginaci\u00f3n del kernel en ffffffffc096bb00 [] Cola de trabajo: eventos 0xffffffffc096bb00 [] Seguimiento de llamadas: []? proceso_one_work+0x1a7/0x360 []? hilo_trabajador+0x30/0x390 []? crear_trabajador+0x1a0/0x1a0 []? kthread+0x116/0x130 []? kthread_flush_work_fn+0x10/0x10 []? ret_from_fork+0x35/0x40 Al retirar el m\u00f3dulo TIPC, el calcet\u00edn del t\u00fanel UDP se retrasar\u00e1 para liberarse en una cola de trabajo, ya que sock_release() no se puede realizar en rtnl_lock(). Si la cola de trabajo est\u00e1 programada para ejecutarse despu\u00e9s de eliminar el m\u00f3dulo TIPC, el kernel fallar\u00e1 porque el c\u00f3digo de la funci\u00f3n de cola de trabajo cleanup_beareri() ya no existe al intentar invocarlo. Para solucionarlo, este parche introduce un miembro wq_count en tipc_net para rastrear el n\u00famero de colas de trabajo programadas y esperar y salir hasta que todas las colas de trabajo est\u00e9n terminadas en tipc_exit_net()."}], "lastModified": "2025-03-13T21:23:34.380", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "ADE30467-B5EA-410E-96F2-A02EC74BEE60", "versionEndExcluding": "5.4.124", "versionStartIncluding": "4.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C3E7E799-1C8A-45FB-9E07-4731996144C9", "versionEndExcluding": "5.10.42", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2C8A1D02-81A7-44E5-ACFD-CC6A6694F930", "versionEndExcluding": "5.12.9", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "96AC23B2-D46A-49D9-8203-8E1BEDCA8532"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DA610E30-717C-4700-9F77-A3C9244F3BFD"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}