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CVE-2022-49989

Estado: AnalizadaMedia (5.5)—

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

xen/privcmd: fix error exit of privcmd_ioctl_dm_op()

The error exit of privcmd_ioctl_dm_op() is calling unlock_pages() potentially with pages being NULL, leading to a NULL dereference.

Additionally lock_pages() doesn't check for pin_user_pages_fast() having been completely successful, resulting in potentially not locking all pages into memory. This could result in sporadic failures when using the related memory in user mode.

Fix all of that by calling unlock_pages() always with the real number of pinned pages, which will be zero in case pages being NULL, and by checking the number of pages pinned by pin_user_pages_fast() matching the expected number of pages.

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-2022-49989",
  "cveTags": [],
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        "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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          "programFiles": [
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  "published": "2025-06-18T11:15:26.530",
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/privcmd: fix error exit of privcmd_ioctl_dm_op()\n\nThe error exit of privcmd_ioctl_dm_op() is calling unlock_pages()\npotentially with pages being NULL, leading to a NULL dereference.\n\nAdditionally lock_pages() doesn't check for pin_user_pages_fast()\nhaving been completely successful, resulting in potentially not\nlocking all pages into memory. This could result in sporadic failures\nwhen using the related memory in user mode.\n\nFix all of that by calling unlock_pages() always with the real number\nof pinned pages, which will be zero in case pages being NULL, and by\nchecking the number of pages pinned by pin_user_pages_fast() matching\nthe expected number of pages."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xen/privcmd: corrección del error de salida de privcmd_ioctl_dm_op(). La salida de error de privcmd_ioctl_dm_op() está llamando a unlock_pages() potencialmente con páginas NULL, lo que lleva a una desreferencia NULL. Además, lock_pages() no comprueba si pin_user_pages_fast() ha sido completamente exitoso, lo que resulta en que potencialmente no se bloqueen todas las páginas en la memoria. Esto podría resultar en fallos esporádicos al usar la memoria relacionada en modo de usuario. Corrija todo esto llamando a unlock_pages() siempre con el número real de páginas ancladas, que será cero en caso de que pages sea NULL, y comprobando que el número de páginas ancladas por pin_user_pages_fast() coincida con el número esperado de páginas."
    }
  ],
  "lastModified": "2026-06-17T05:19:41.570",
  "configurations": [
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      "nodes": [
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