{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/type1: Unpin zero pages\n\nThere's currently a reference count leak on the zero page.  We increment\nthe reference via pin_user_pages_remote(), but the page is later handled\nas an invalid/reserved page, therefore it's not accounted against the\nuser and not unpinned by our put_pfn().\n\nIntroducing special zero page handling in put_pfn() would resolve the\nleak, but without accounting of the zero page, a single user could\nstill create enough mappings to generate a reference count overflow.\n\nThe zero page is always resident, so for our purposes there's no reason\nto keep it pinned.  Therefore, add a loop to walk pages returned from\npin_user_pages_remote() and unpin any zero pages."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/vfio/vfio_iommu_type1.c"
               ],
               "versions": [
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "578d644edc7d",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "5321908ef74f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "5d721bf22293",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "873aefb376bb",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/vfio/vfio_iommu_type1.c"
               ],
               "versions": [
                  {
                     "version": "5.10.146",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.68",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.19.9",
                     "lessThanOrEqual": "5.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.0",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/578d644edc7d2c1ff53f7e4d0a25da473deb4a03"
            },
            {
               "url": "https://git.kernel.org/stable/c/5321908ef74fb593e0dbc8737d25038fc86c9986"
            },
            {
               "url": "https://git.kernel.org/stable/c/5d721bf222936f5cf3ee15ced53cc483ecef7e46"
            },
            {
               "url": "https://git.kernel.org/stable/c/873aefb376bbc0ed1dd2381ea1d6ec88106fdbd4"
            }
         ],
         "title": "vfio/type1: Unpin zero pages",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2022-48700",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}