CVE-2021-47294

{"id": "CVE-2021-47294", "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": "2024-05-21T15:15:17.323", "references": [{"url": "https://git.kernel.org/stable/c/25df44e90ff5959b5c24ad361b648504a7e39ef3", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/48866fd5c361ea417ed24b43fc2a7dc2f5b060ef", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/517a16b1a88bdb6b530f48d5d153478b2552d9a8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6811744bd0efb9e472cb15d066cdb460beb8cb8a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/853262355518cd1247515b74e83fabf038aa6c29", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a01634bf91f2b6c42583770eb6815fb6d1e251cf", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/bc1660206c3723c37ed4d622ad81781f1e987250", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/25df44e90ff5959b5c24ad361b648504a7e39ef3", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/48866fd5c361ea417ed24b43fc2a7dc2f5b060ef", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/517a16b1a88bdb6b530f48d5d153478b2552d9a8", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/6811744bd0efb9e472cb15d066cdb460beb8cb8a", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/853262355518cd1247515b74e83fabf038aa6c29", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/a01634bf91f2b6c42583770eb6815fb6d1e251cf", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/bc1660206c3723c37ed4d622ad81781f1e987250", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-672"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetrom: Decrease sock refcount when sock timers expire\n\nCommit 63346650c1a9 (\"netrom: switch to sock timer API\") switched to use\nsock timer API. It replaces mod_timer() by sk_reset_timer(), and\ndel_timer() by sk_stop_timer().\n\nFunction sk_reset_timer() will increase the refcount of sock if it is\ncalled on an inactive timer, hence, in case the timer expires, we need to\ndecrease the refcount ourselves in the handler, otherwise, the sock\nrefcount will be unbalanced and the sock will never be freed."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: netrom: Disminuir el recuento de sock cuando caducan los temporizadores de sock. La confirmaci\u00f3n 63346650c1a9 (\"netrom: cambiar a API de temporizador de sock\") cambi\u00f3 para usar la API de temporizador de sock. Reemplaza mod_timer() por sk_reset_timer() y del_timer() por sk_stop_timer(). La funci\u00f3n sk_reset_timer() aumentar\u00e1 el recuento del sock si se llama en un temporizador inactivo, por lo tanto, en caso de que el temporizador expire, debemos disminuir el recuento nosotros mismos en el controlador; de lo contrario, el recuento del calcet\u00edn se desequilibrar\u00e1 y el sock nunca ser\u00e1 liberado."}], "lastModified": "2025-06-23T20:19:04.490", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3E3226CA-19FE-4D01-AF65-32A8C5BF4B1D", "versionEndExcluding": "4.4.277", "versionStartIncluding": "4.4.173"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9BF1259C-DF0B-48E1-8EA8-2AB91A7AA4E4", "versionEndExcluding": "4.9.277", "versionStartIncluding": "4.9.155"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E285CAFB-29D0-4687-BDD6-1EAB4F397AC7", "versionEndExcluding": "4.14.241", "versionStartIncluding": "4.14.98"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1DFDBA04-2E4D-4E4A-A386-237989BB8C1E", "versionEndExcluding": "4.19.199", "versionStartIncluding": "4.19.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "89436D92-8C87-413A-8CD9-4CF06FCCEABD", "versionEndExcluding": "5.4.136", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1BD5A2EE-859F-40FC-BDAC-167AAE37C870", "versionEndExcluding": "5.10.54", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "512C22FC-1524-4E6F-9E62-4F4B7B6E0576", "versionEndExcluding": "5.13.6", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.18.134:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "407D22E1-55CF-4117-B460-329990673A2A"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:4.20.7:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1AF86F57-4FAC-4E41-8FB4-F35F985F4DC3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "71268287-21A8-4488-AA4F-23C473153131"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "23B9E5C6-FAB5-4A02-9E39-27C8787B0991"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}