{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hso: fix null-ptr-deref during tty device unregistration\n\nMultiple ttys try to claim the same the minor number causing a double\nunregistration of the same device. The first unregistration succeeds\nbut the next one results in a null-ptr-deref.\n\nThe get_free_serial_index() function returns an available minor number\nbut doesn't assign it immediately. The assignment is done by the caller\nlater. But before this assignment, calls to get_free_serial_index()\nwould return the same minor number.\n\nFix this by modifying get_free_serial_index to assign the minor number\nimmediately after one is found to be and rename it to obtain_minor()\nto better reflect what it does. Similary, rename set_serial_by_index()\nto release_minor() and modify it to free up the minor number of the\ngiven hso_serial. Every obtain_minor() should have corresponding\nrelease_minor() call."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/net/usb/hso.c"
               ],
               "versions": [
                  {
                     "version": "72dc1c096c70",
                     "lessThan": "a462067d7c8e",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "72dc1c096c70",
                     "lessThan": "145c89c441d2",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "72dc1c096c70",
                     "lessThan": "caf5ac93b3b5",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "72dc1c096c70",
                     "lessThan": "92028d7a31e5",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "72dc1c096c70",
                     "lessThan": "4a2933c88399",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "72dc1c096c70",
                     "lessThan": "dc195928d7e4",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "72dc1c096c70",
                     "lessThan": "388d05f70f1e",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "72dc1c096c70",
                     "lessThan": "8a12f8836145",
                     "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/net/usb/hso.c"
               ],
               "versions": [
                  {
                     "version": "2.6.27",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "2.6.27",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.4.268",
                     "lessThanOrEqual": "4.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.9.268",
                     "lessThanOrEqual": "4.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.14.232",
                     "lessThanOrEqual": "4.14.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.187",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.112",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.30",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.11.14",
                     "lessThanOrEqual": "5.11.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.12",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/a462067d7c8e6953a733bf5ade8db947b1bb5449"
            },
            {
               "url": "https://git.kernel.org/stable/c/145c89c441d27696961752bf51b323f347601bee"
            },
            {
               "url": "https://git.kernel.org/stable/c/caf5ac93b3b5d5fac032fc11fbea680e115421b4"
            },
            {
               "url": "https://git.kernel.org/stable/c/92028d7a31e55d53e41cff679156b9432cffcb36"
            },
            {
               "url": "https://git.kernel.org/stable/c/4a2933c88399c0ebc738db39bbce3ae89786d723"
            },
            {
               "url": "https://git.kernel.org/stable/c/dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac"
            },
            {
               "url": "https://git.kernel.org/stable/c/388d05f70f1ee0cac4a2068fd295072f1a44152a"
            },
            {
               "url": "https://git.kernel.org/stable/c/8a12f8836145ffe37e9c8733dce18c22fb668b66"
            }
         ],
         "title": "net: hso: fix null-ptr-deref during tty device unregistration",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-46904",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}