CVE-2022-49964

{"id": "CVE-2022-49964", "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": "2025-06-18T11:15:23.677", "references": [{"url": "https://git.kernel.org/stable/c/a754ee1c66bd0a23e613f0bf865053b29cb90e16", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e75d18cecbb3805895d8ed64da4f78575ec96043", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fw_level\n\nThough acpi_find_last_cache_level() always returned signed value and the\ndocument states it will return any errors caused by lack of a PPTT table,\nit never returned negative values before.\n\nCommit 0c80f9e165f8 (\"ACPI: PPTT: Leave the table mapped for the runtime usage\")\nhowever changed it by returning -ENOENT if no PPTT was found. The value\nreturned from acpi_find_last_cache_level() is then assigned to unsigned\nfw_level.\n\nIt will result in the number of cache leaves calculated incorrectly as\na huge value which will then cause the following warning from __alloc_pages\nas the order would be great than MAX_ORDER because of incorrect and huge\ncache leaves value.\n\n | WARNING: CPU: 0 PID: 1 at mm/page_alloc.c:5407 __alloc_pages+0x74/0x314\n | Modules linked in:\n | CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.19.0-10393-g7c2a8d3ac4c0 #73\n | pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n | pc : __alloc_pages+0x74/0x314\n | lr : alloc_pages+0xe8/0x318\n | Call trace:\n | __alloc_pages+0x74/0x314\n | alloc_pages+0xe8/0x318\n | kmalloc_order_trace+0x68/0x1dc\n | __kmalloc+0x240/0x338\n | detect_cache_attributes+0xe0/0x56c\n | update_siblings_masks+0x38/0x284\n | store_cpu_topology+0x78/0x84\n | smp_prepare_cpus+0x48/0x134\n | kernel_init_freeable+0xc4/0x14c\n | kernel_init+0x2c/0x1b4\n | ret_from_fork+0x10/0x20\n\nFix the same by changing fw_level to be signed integer and return the\nerror from init_cache_level() early in case of error."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64: cacheinfo: Se corrige la asignaci\u00f3n incorrecta de un valor de error con signo a unsigned fw_level. Aunque acpi_find_last_cache_level() siempre devolv\u00eda un valor con signo y el documento indica que devolver\u00e1 cualquier error causado por la falta de una tabla PPTT, nunca antes devolv\u00eda valores negativos. Sin embargo, el commit 0c80f9e165f8 (\"ACPI: PPTT: Dejar la tabla asignada para el uso en tiempo de ejecuci\u00f3n\") la modific\u00f3 devolviendo -ENOENT si no se encontraba PPTT. El valor devuelto por acpi_find_last_cache_level() se asigna entonces a unsigned fw_level. Esto provocar\u00e1 que el n\u00famero de hojas de cach\u00e9 se calcule incorrectamente como un valor enorme, lo que provocar\u00e1 la siguiente advertencia de __alloc_pages, ya que el orden ser\u00eda mayor que MAX_ORDER debido a un valor incorrecto y enorme de hojas de cach\u00e9. ADVERTENCIA: CPU: 0 PID: 1 en mm/page_alloc.c:5407 __alloc_pages+0x74/0x314 | M\u00f3dulos vinculados: | CPU: 0 PID: 1 Comm: swapper/0 No contaminado 5.19.0-10393-g7c2a8d3ac4c0 #73 | pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) | pc : __alloc_pages+0x74/0x314 | lr : alloc_pages+0xe8/0x318 | Rastreo de llamadas: | __alloc_pages+0x74/0x314 | alloc_pages+0xe8/0x318 | kmalloc_order_trace+0x68/0x1dc | Corrija el mismo problema cambiando fw_level para que sea un entero con signo y devuelva el error de init_cache_level() de manera temprana en caso de error."}], "lastModified": "2025-11-14T18:08:14.033", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "53782EE9-985B-4CD0-B4B8-22210A8CBCB9", "versionEndExcluding": "5.19.7", "versionStartIncluding": "5.19.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E8BD11A3-8643-49B6-BADE-5029A0117325"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5F0AD220-F6A9-4012-8636-155F1B841FAD"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}