CVE-2022-49989 (GCVE-0-2022-49989)
Vulnerability from cvelistv5
Published
2025-06-18 11:00
Modified
2025-06-18 11:00
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: ab520be8cd5d56867fc95cfbc34b90880faf1f9d
Version: ab520be8cd5d56867fc95cfbc34b90880faf1f9d
Version: ab520be8cd5d56867fc95cfbc34b90880faf1f9d
Version: ab520be8cd5d56867fc95cfbc34b90880faf1f9d
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/xen/privcmd.c"
          ],
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          "vendor": "Linux",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "4.11"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
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            {
              "lessThanOrEqual": "5.15.*",
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            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.6",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
            }
          ]
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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\u0027t 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:00:50.126Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef"
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        {
          "url": "https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a"
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        {
          "url": "https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54"
        }
      ],
      "title": "xen/privcmd: fix error exit of privcmd_ioctl_dm_op()",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49989",
    "datePublished": "2025-06-18T11:00:50.126Z",
    "dateReserved": "2025-06-18T10:57:27.386Z",
    "dateUpdated": "2025-06-18T11:00:50.126Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49989\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:26.530\",\"lastModified\":\"2025-06-18T13:46:52.973\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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\u0027t 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: correcci\u00f3n del error de salida de privcmd_ioctl_dm_op(). La salida de error de privcmd_ioctl_dm_op() est\u00e1 llamando a unlock_pages() potencialmente con p\u00e1ginas NULL, lo que lleva a una desreferencia NULL. Adem\u00e1s, lock_pages() no comprueba si pin_user_pages_fast() ha sido completamente exitoso, lo que resulta en que potencialmente no se bloqueen todas las p\u00e1ginas en la memoria. Esto podr\u00eda resultar en fallos espor\u00e1dicos al usar la memoria relacionada en modo de usuario. Corrija todo esto llamando a unlock_pages() siempre con el n\u00famero real de p\u00e1ginas ancladas, que ser\u00e1 cero en caso de que pages sea NULL, y comprobando que el n\u00famero de p\u00e1ginas ancladas por pin_user_pages_fast() coincida con el n\u00famero esperado de p\u00e1ginas.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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