CVE-2022-49436

{"id": "CVE-2022-49436", "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": "2025-02-26T07:01:20.057", "references": [{"url": "https://git.kernel.org/stable/c/0e0946e22f3665d27325d389ff45ade6e93f3678", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b073096df4dec70d0436321b7093bad27ae91f9e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-401"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/papr_scm: Fix leaking nvdimm_events_map elements\n\nRight now 'char *' elements allocated for individual 'stat_id' in\n'papr_scm_priv.nvdimm_events_map[]' during papr_scm_pmu_check_events(), get\nleaked in papr_scm_remove() and papr_scm_pmu_register(),\npapr_scm_pmu_check_events() error paths.\n\nAlso individual 'stat_id' arent NULL terminated 'char *' instead they are fixed\n8-byte sized identifiers. However papr_scm_pmu_register() assumes it to be a\nNULL terminated 'char *' and at other places it assumes it to be a\n'papr_scm_perf_stat.stat_id' sized string which is 8-byes in size.\n\nFix this by allocating the memory for papr_scm_priv.nvdimm_events_map to also\ninclude space for 'stat_id' entries. This is possible since number of available\nevents/stat_ids are known upfront. This saves some memory and one extra level of\nindirection from 'nvdimm_events_map' to 'stat_id'. Also rest of the code\ncan continue to call 'kfree(papr_scm_priv.nvdimm_events_map)' without needing to\niterate over the array and free up individual elements."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: powerpc/papr_scm: Se soluciona la fuga de elementos nvdimm_events_map En este momento, los elementos 'char *' asignados para el individuo 'stat_id' en 'papr_scm_priv.nvdimm_events_map[]' durante papr_scm_pmu_check_events(), se filtran en las rutas de error papr_scm_remove() y papr_scm_pmu_register(), papr_scm_pmu_check_events(). Adem\u00e1s, los 'stat_id' individuales no son 'char *' terminados en NULL, sino que son identificadores fijos de tama\u00f1o de 8 bytes. Sin embargo, papr_scm_pmu_register() asume que es un 'char *' terminado en NULL y en otros lugares asume que es una cadena de tama\u00f1o 'papr_scm_perf_stat.stat_id' que tiene un tama\u00f1o de 8 bytes. Solucione este problema asignando la memoria para papr_scm_priv.nvdimm_events_map para que tambi\u00e9n incluya espacio para las entradas 'stat_id'. Esto es posible ya que la cantidad de eventos/stat_id disponibles se conoce de antemano. Esto ahorra algo de memoria y un nivel adicional de indirecci\u00f3n de 'nvdimm_events_map' a 'stat_id'. Adem\u00e1s, el resto del c\u00f3digo puede continuar llamando a 'kfree(papr_scm_priv.nvdimm_events_map)' sin necesidad de iterar sobre la matriz y liberar elementos individuales."}], "lastModified": "2025-10-22T17:26:01.213", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8E122216-2E9E-4B3E-B7B8-D575A45BA3C2", "versionEndExcluding": "5.18.3", "versionStartIncluding": "5.18"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}