CVE-2021-46937

{"id": "CVE-2021-46937", "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:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-02-27T10:15:08.067", "references": [{"url": "https://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-668"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()'\n\nDAMON debugfs interface increases the reference counts of 'struct pid's\nfor targets from the 'target_ids' file write callback\n('dbgfs_target_ids_write()'), but decreases the counts only in DAMON\nmonitoring termination callback ('dbgfs_before_terminate()').\n\nTherefore, when 'target_ids' file is repeatedly written without DAMON\nmonitoring start/termination, the reference count is not decreased and\ntherefore memory for the 'struct pid' cannot be freed. This commit\nfixes this issue by decreasing the reference counts when 'target_ids' is\nwritten."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/damon/dbgfs: corrige las fugas de 'struct pid' en 'dbgfs_target_ids_write()' La interfaz DAMON debugfs aumenta los recuentos de referencias de 'struct pid' para los objetivos de la escritura del archivo 'target_ids' devoluci\u00f3n de llamada ('dbgfs_target_ids_write()'), pero disminuye los recuentos solo en la devoluci\u00f3n de llamada de terminaci\u00f3n de monitoreo de DAMON ('dbgfs_before_terminate()'). Por lo tanto, cuando el archivo 'target_ids' se escribe repetidamente sin que DAMON supervise el inicio/terminaci\u00f3n, el recuento de referencias no disminuye y, por lo tanto, no se puede liberar memoria para 'struct pid'. Este commit soluciona este problema al disminuir el recuento de referencias cuando se escribe 'target_ids'."}], "lastModified": "2024-04-10T18:59:16.507", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8CC64BCA-D219-487C-A123-4C470FE30AB2", "versionEndExcluding": "5.15.13", "versionStartIncluding": "5.15.0"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}