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CVE-2022-49828

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

hugetlbfs: don't delete error page from pagecache

This change is very similar to the change that was made for shmem [1], and it solves the same problem but for HugeTLBFS instead.

Currently, when poison is found in a HugeTLB page, the page is removed from the page cache. That means that attempting to map or read that hugepage in the future will result in a new hugepage being allocated instead of notifying the user that the page was poisoned. As [1] states, this is effectively memory corruption.

The fix is to leave the page in the page cache. If the user attempts to use a poisoned HugeTLB page with a syscall, the syscall will fail with EIO, the same error code that shmem uses. For attempts to map the page, the thread will get a BUS_MCEERR_AR SIGBUS.

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[1]: commit a76054266661 ("mm: shmem: don't truncate page if memory failure happens")

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-49828",
  "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"
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        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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          "product": "Linux",
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          ],
          "programFiles": [
            "fs/hugetlbfs/inode.c",
            "mm/hugetlb.c",
            "mm/memory-failure.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "versions": [
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              "version": "4.13"
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              "status": "unaffected",
              "version": "5.15.80",
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            },
            {
              "status": "unaffected",
              "version": "6.0.10",
              "versionType": "semver",
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            },
            {
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/hugetlbfs/inode.c",
            "mm/hugetlb.c",
            "mm/memory-failure.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-05-01T15:16:06.260",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/30571f28bb35c826219971c63bcf60d2517112ed",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8625147cafaa9ba74713d682f5185eb62cb2aedb",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
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      "url": "https://git.kernel.org/stable/c/ec667443b2dbc6cdbbac4073e51a17733158ec6a",
      "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\nhugetlbfs: don't delete error page from pagecache\n\nThis change is very similar to the change that was made for shmem [1], and\nit solves the same problem but for HugeTLBFS instead.\n\nCurrently, when poison is found in a HugeTLB page, the page is removed\nfrom the page cache.  That means that attempting to map or read that\nhugepage in the future will result in a new hugepage being allocated\ninstead of notifying the user that the page was poisoned.  As [1] states,\nthis is effectively memory corruption.\n\nThe fix is to leave the page in the page cache.  If the user attempts to\nuse a poisoned HugeTLB page with a syscall, the syscall will fail with\nEIO, the same error code that shmem uses.  For attempts to map the page,\nthe thread will get a BUS_MCEERR_AR SIGBUS.\n\n[1]: commit a76054266661 (\"mm: shmem: don't truncate page if memory failure happens\")"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: hugetlbfs: no elimine la página de error de la caché de páginas Este cambio es muy similar al cambio que se realizó para shmem [1] y resuelve el mismo problema, pero para HugeTLBFS. Actualmente, cuando se encuentra veneno en una página HugeTLB, la página se elimina de la caché de páginas. Eso significa que intentar mapear o leer esa página enorme en el futuro dará como resultado que se asigne una nueva página enorme en lugar de notificar al usuario que la página fue envenenada. Como indica [1], esto es efectivamente corrupción de memoria. La solución es dejar la página en la caché de páginas. Si el usuario intenta usar una página HugeTLB envenenada con una llamada al sistema, la llamada al sistema fallará con EIO, el mismo código de error que usa shmem. Para los intentos de mapear la página, el hilo obtendrá un SIGBUS BUS_MCEERR_AR. [1]: commit a76054266661 (\"mm: shmem: no truncar la página si se produce un fallo de memoria\")"
    }
  ],
  "lastModified": "2026-06-17T05:19:14.610",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}