CVE-2022-49964 (GCVE-0-2022-49964)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:00 – Updated: 2026-05-11 19:10
VLAI
Title
arm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fw_level
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fw_level Though acpi_find_last_cache_level() always returned signed value and the document states it will return any errors caused by lack of a PPTT table, it never returned negative values before. Commit 0c80f9e165f8 ("ACPI: PPTT: Leave the table mapped for the runtime usage") however changed it by returning -ENOENT if no PPTT was found. The value returned from acpi_find_last_cache_level() is then assigned to unsigned fw_level. It will result in the number of cache leaves calculated incorrectly as a huge value which will then cause the following warning from __alloc_pages as the order would be great than MAX_ORDER because of incorrect and huge cache leaves value. | WARNING: CPU: 0 PID: 1 at mm/page_alloc.c:5407 __alloc_pages+0x74/0x314 | Modules linked in: | CPU: 0 PID: 1 Comm: swapper/0 Not tainted 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 | Call trace: | __alloc_pages+0x74/0x314 | alloc_pages+0xe8/0x318 | kmalloc_order_trace+0x68/0x1dc | __kmalloc+0x240/0x338 | detect_cache_attributes+0xe0/0x56c | update_siblings_masks+0x38/0x284 | store_cpu_topology+0x78/0x84 | smp_prepare_cpus+0x48/0x134 | kernel_init_freeable+0xc4/0x14c | kernel_init+0x2c/0x1b4 | ret_from_fork+0x10/0x20 Fix the same by changing fw_level to be signed integer and return the error from init_cache_level() early in case of error.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f03d253ba71994b196f342a7acad448a56812a8c , < a754ee1c66bd0a23e613f0bf865053b29cb90e16 (git)
Affected: 0c80f9e165f8f9cca743d7b6cbdb54362da297e0 , < e75d18cecbb3805895d8ed64da4f78575ec96043 (git)
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Linux Linux Affected: 5.19.4 , < 5.19.7 (semver)
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            "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."
          },
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            "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."
          }
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        "id": "CVE-2022-49964",
        "lastModified": "2026-06-17T05:19:38.163",
        "metrics": {
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        "vulnStatus": "Analyzed",
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      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-05T10:06:12+00:00",
      "cve": "CVE-2022-49964",
      "id": "CVE-2022-49964",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "321",
      "product_status:known_affected": "38",
      "product_status:known_not_affected": "43",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: arm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fw_level",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49964.json",
      "version": "3"
    }
  }
}



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