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CVE-2022-49699

Estado: AnalizadaMedia (5.5)—

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

filemap: Handle sibling entries in filemap_get_read_batch()

If a read races with an invalidation followed by another read, it is possible for a folio to be replaced with a higher-order folio. If that happens, we'll see a sibling entry for the new folio in the next iteration of the loop. This manifests as a NULL pointer dereference while holding the RCU read lock.

Handle this by simply returning. The next call will find the new folio and handle it correctly. The other ways of handling this rare race are more complex and it's just not worth it.

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-2022-49699",
  "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
      }
    ]
  },
  "affected": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
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          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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          "programFiles": [
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          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "version": "5.12"
            },
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              "status": "unaffected",
              "version": "0",
              "lessThan": "5.12",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.18.8",
              "versionType": "semver",
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              "status": "unaffected",
              "version": "5.19",
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          ],
          "programFiles": [
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          "defaultStatus": "affected"
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  "published": "2025-02-26T07:01:44.640",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/a66f131d30e53000f08301776bf85c912ef47aad",
      "tags": [
        "Patch"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
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      "url": "https://git.kernel.org/stable/c/cb995f4eeba9d268fd4b56c2423ad6c1d1ea1b82",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfilemap: Handle sibling entries in filemap_get_read_batch()\n\nIf a read races with an invalidation followed by another read, it is\npossible for a folio to be replaced with a higher-order folio.  If that\nhappens, we'll see a sibling entry for the new folio in the next iteration\nof the loop.  This manifests as a NULL pointer dereference while holding\nthe RCU read lock.\n\nHandle this by simply returning.  The next call will find the new folio\nand handle it correctly.  The other ways of handling this rare race are\nmore complex and it's just not worth it."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: filemap: Manejar entradas hermanas en filemap_get_read_batch() Si una lectura compite con una invalidación seguida de otra lectura, es posible que un folio sea reemplazado por un folio de orden superior. Si eso sucede, veremos una entrada hermana para el nuevo folio en la siguiente iteración del bucle. Esto se manifiesta como una desreferencia de puntero NULL mientras se mantiene el bloqueo de lectura de RCU. Gestiona esto simplemente regresando. La siguiente llamada encontrará el nuevo folio y lo manejará correctamente. Las otras formas de gestionar esta rara ejecución son más complejas y simplemente no vale la pena."
    }
  ],
  "lastModified": "2026-06-17T05:18:53.970",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}