{"cve":"CVE-2022-49964","nvd":{"published":"2025-06-18T11:15:23.677","modified":"2026-06-17T05:19:38.163","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/a754ee1c66bd0a23e613f0bf865053b29cb90e16","https://git.kernel.org/stable/c/e75d18cecbb3805895d8ed64da4f78575ec96043"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:03:23.287444849+00:00"},"epss":{"cve":"CVE-2022-49964","score":0.00215,"percentile":0.11892,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}