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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54
Impacted products
Vendor Product Version
Linux Linux Version: ab520be8cd5d56867fc95cfbc34b90880faf1f9d
Version: ab520be8cd5d56867fc95cfbc34b90880faf1f9d
Version: ab520be8cd5d56867fc95cfbc34b90880faf1f9d
Version: ab520be8cd5d56867fc95cfbc34b90880faf1f9d
 Create a notification for this product.
   Linux Linux Version: 4.11
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/xen/privcmd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6de50db104af0dc921f593fd95c55db86a52ceef",
              "status": "affected",
              "version": "ab520be8cd5d56867fc95cfbc34b90880faf1f9d",
              "versionType": "git"
            },
            {
              "lessThan": "c2b7bae7c90051fd6a679d5dee00400d67ebbf4a",
              "status": "affected",
              "version": "ab520be8cd5d56867fc95cfbc34b90880faf1f9d",
              "versionType": "git"
            },
            {
              "lessThan": "45d47bd9b96e7874b98dbcc7602fe2826c5d62a6",
              "status": "affected",
              "version": "ab520be8cd5d56867fc95cfbc34b90880faf1f9d",
              "versionType": "git"
            },
            {
              "lessThan": "c5deb27895e017a0267de0a20d140ad5fcc55a54",
              "status": "affected",
              "version": "ab520be8cd5d56867fc95cfbc34b90880faf1f9d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/xen/privcmd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
              "lessThan": "4.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.140",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.64",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.6",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": [
        {
          "url": "https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef"
        },
        {
          "url": "https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a"
        },
        {
          "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"
      }
    }
  },
  "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"
  },
  "dataType": "CVE_RECORD",
  "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.\"}],\"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\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.