{
   "CVE_data_meta" : {
      "ASSIGNER" : "cve@mitre.org",
      "ID" : "CVE-2018-18955",
      "STATE" : "PUBLIC"
   },
   "affects" : {
      "vendor" : {
         "vendor_data" : [
            {
               "product" : {
                  "product_data" : [
                     {
                        "product_name" : "n/a",
                        "version" : {
                           "version_data" : [
                              {
                                 "version_value" : "n/a"
                              }
                           ]
                        }
                     }
                  ]
               },
               "vendor_name" : "n/a"
            }
         ]
      }
   },
   "data_format" : "MITRE",
   "data_type" : "CVE",
   "data_version" : "4.0",
   "description" : {
      "description_data" : [
         {
            "lang" : "eng",
            "value" : "In the Linux kernel 4.15.x through 4.19.x before 4.19.2, map_write() in kernel/user_namespace.c allows privilege escalation because it mishandles nested user namespaces with more than 5 UID or GID ranges. A user who has CAP_SYS_ADMIN in an affected user namespace can bypass access controls on resources outside the namespace, as demonstrated by reading /etc/shadow. This occurs because an ID transformation takes place properly for the namespaced-to-kernel direction but not for the kernel-to-namespaced direction."
         }
      ]
   },
   "problemtype" : {
      "problemtype_data" : [
         {
            "description" : [
               {
                  "lang" : "eng",
                  "value" : "n/a"
               }
            ]
         }
      ]
   },
   "references" : {
      "reference_data" : [
         {
            "name" : "45886",
            "refsource" : "EXPLOIT-DB",
            "url" : "https://www.exploit-db.com/exploits/45886/"
         },
         {
            "name" : "45915",
            "refsource" : "EXPLOIT-DB",
            "url" : "https://www.exploit-db.com/exploits/45915/"
         },
         {
            "name" : "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd",
            "refsource" : "MISC",
            "url" : "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd"
         },
         {
            "name" : "https://bugs.chromium.org/p/project-zero/issues/detail?id=1712",
            "refsource" : "MISC",
            "url" : "https://bugs.chromium.org/p/project-zero/issues/detail?id=1712"
         },
         {
            "name" : "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.19",
            "refsource" : "MISC",
            "url" : "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.19"
         },
         {
            "name" : "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.2",
            "refsource" : "MISC",
            "url" : "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.2"
         },
         {
            "name" : "https://github.com/torvalds/linux/commit/d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd",
            "refsource" : "MISC",
            "url" : "https://github.com/torvalds/linux/commit/d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd"
         },
         {
            "name" : "USN-3832-1",
            "refsource" : "UBUNTU",
            "url" : "https://usn.ubuntu.com/3832-1/"
         },
         {
            "name" : "USN-3833-1",
            "refsource" : "UBUNTU",
            "url" : "https://usn.ubuntu.com/3833-1/"
         },
         {
            "name" : "USN-3835-1",
            "refsource" : "UBUNTU",
            "url" : "https://usn.ubuntu.com/3835-1/"
         },
         {
            "name" : "USN-3836-1",
            "refsource" : "UBUNTU",
            "url" : "https://usn.ubuntu.com/3836-1/"
         },
         {
            "name" : "USN-3836-2",
            "refsource" : "UBUNTU",
            "url" : "https://usn.ubuntu.com/3836-2/"
         },
         {
            "name" : "105941",
            "refsource" : "BID",
            "url" : "http://www.securityfocus.com/bid/105941"
         }
      ]
   }
}