{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-30T06:16:25.225","vulnerabilities":[{"cve":{"id":"CVE-2021-47603","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2024-06-19T15:15:54.863","lastModified":"2024-11-21T06:36:38.873","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\naudit: improve robustness of the audit queue handling\n\nIf the audit daemon were ever to get stuck in a stopped state the\nkernel's kauditd_thread() could get blocked attempting to send audit\nrecords to the userspace audit daemon.  With the kernel thread\nblocked it is possible that the audit queue could grow unbounded as\ncertain audit record generating events must be exempt from the queue\nlimits else the system enter a deadlock state.\n\nThis patch resolves this problem by lowering the kernel thread's\nsocket sending timeout from MAX_SCHEDULE_TIMEOUT to HZ/10 and tweaks\nthe kauditd_send_queue() function to better manage the various audit\nqueues when connection problems occur between the kernel and the\naudit daemon.  With this patch, the backlog may temporarily grow\nbeyond the defined limits when the audit daemon is stopped and the\nsystem is under heavy audit pressure, but kauditd_thread() will\ncontinue to make progress and drain the queues as it would for other\nconnection problems.  For example, with the audit daemon put into a\nstopped state and the system configured to audit every syscall it\nwas still possible to shutdown the system without a kernel panic,\ndeadlock, etc.; granted, the system was slow to shutdown but that is\nto be expected given the extreme pressure of recording every syscall.\n\nThe timeout value of HZ/10 was chosen primarily through\nexperimentation and this developer's \"gut feeling\".  There is likely\nno one perfect value, but as this scenario is limited in scope (root\nprivileges would be needed to send SIGSTOP to the audit daemon), it\nis likely not worth exposing this as a tunable at present.  This can\nalways be done at a later date if it proves necessary."},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: auditoría: mejora la solidez del manejo de la cola de auditoría. Si el daemon de auditoría alguna vez se atascara en un estado detenido, kauditd_thread() del kernel podría bloquearse al intentar enviar registros de auditoría al espacio de usuario. daemon de auditoría. Con el subproceso del núcleo bloqueado, es posible que la cola de auditoría crezca sin límites, ya que ciertos eventos que generan registros de auditoría deben estar exentos de los límites de la cola, de lo contrario, el sistema entrará en un estado de bloqueo. Este parche resuelve este problema reduciendo el tiempo de espera de envío del socket del subproceso del núcleo de MAX_SCHEDULE_TIMEOUT a HZ/10 y modifica la función kauditd_send_queue() para gestionar mejor las distintas colas de auditoría cuando se producen problemas de conexión entre el núcleo y el daemon de auditoría. Con este parche, el trabajo pendiente puede crecer temporalmente más allá de los límites definidos cuando se detiene el daemon de auditoría y el sistema está bajo una fuerte presión de auditoría, pero kauditd_thread() continuará progresando y drenando las colas como lo haría con otros problemas de conexión. Por ejemplo, con el daemon de auditoría en estado detenido y el sistema configurado para auditar cada llamada al sistema, aún era posible apagar el sistema sin pánico en el kernel, interbloqueo, etc.; Por supuesto, el sistema tardó en cerrarse, pero eso es de esperarse dada la presión extrema de registrar cada llamada al sistema. El valor de tiempo de espera de HZ/10 se eligió principalmente a través de la experimentación y el \"instinto\" de este desarrollador. Probablemente no exista un valor perfecto, pero como este escenario tiene un alcance limitado (se necesitarían privilegios de root para enviar SIGSTOP al daemon de auditoría), probablemente no valga la pena exponerlo como un ajuste ajustable en este momento. Esto siempre se puede hacer en una fecha posterior si resulta necesario."}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","baseScore":4.4,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":0.8,"impactScore":3.6}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-667"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10.7","versionEndExcluding":"4.11","matchCriteriaId":"002AFF57-621F-4DFC-BA33-323006B9E2CB"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"4.14.259","matchCriteriaId":"F52B82B4-2759-4BAE-914F-9BCD47B64147"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"4.19.222","matchCriteriaId":"2D0D89BC-6CF8-4BFB-8C91-472348052528"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.4.168","matchCriteriaId":"195EBAA1-4CCE-4898-9351-F4A0DBCAA022"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.88","matchCriteriaId":"A657B2D0-5B9D-42BE-A3BF-228DBC1B057C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.11","matchCriteriaId":"11274E95-438A-449A-B100-01B2B0046669"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*","matchCriteriaId":"357AA433-37E8-4323-BFB2-3038D6E4B414"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*","matchCriteriaId":"A73429BA-C2D9-4D0C-A75F-06A1CA8B3983"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*","matchCriteriaId":"F621B5E3-E99D-49E7-90B9-EC3B77C95383"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:*","matchCriteriaId":"F7BFDCAA-1650-49AA-8462-407DD593F94F"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.16:rc5:*:*:*:*:*:*","matchCriteriaId":"6EC9882F-866D-4ACB-8FBC-213D8D8436C8"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0d3277eabd542fb662be23696e5ec9f390d688e1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/4cc6badff97f74d0fce65f9784b5df3b64e4250b","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/75fdb751f84727d614deea0571a1490c3225d83a","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/8389f50ceb854cb437fefb9330d5024ed3c7c1f5","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/a5f4d17daf2e6cd7c1d9676b476147f6b4ac53f2","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/f4b3ee3c85551d2d343a3ba159304066523f730f","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/0d3277eabd542fb662be23696e5ec9f390d688e1","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/4cc6badff97f74d0fce65f9784b5df3b64e4250b","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/75fdb751f84727d614deea0571a1490c3225d83a","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/8389f50ceb854cb437fefb9330d5024ed3c7c1f5","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/a5f4d17daf2e6cd7c1d9676b476147f6b4ac53f2","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/f4b3ee3c85551d2d343a3ba159304066523f730f","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]}]}}]}