{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: synproxy: Fix out of bounds when parsing TCP options\n\nThe TCP option parser in synproxy (synproxy_parse_options) could read\none byte out of bounds. When the length is 1, the execution flow gets\ninto the loop, reads one byte of the opcode, and if the opcode is\nneither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds\nthe length of 1.\n\nThis fix is inspired by commit 9609dad263f8 (\"ipv4: tcp_input: fix stack\nout of bounds when parsing TCP options.\").\n\nv2 changes:\n\nAdded an early return when length < 0 to avoid calling\nskb_header_pointer with negative length."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/netfilter/nf_synproxy_core.c"
               ],
               "versions": [
                  {
                     "version": "48b1de4c110a",
                     "lessThan": "e1eb98cfeafd",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "48b1de4c110a",
                     "lessThan": "576c1526b4d8",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "48b1de4c110a",
                     "lessThan": "674b5f0c6a4f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "48b1de4c110a",
                     "lessThan": "7d9a9a1a88a3",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "48b1de4c110a",
                     "lessThan": "6defc77d48ef",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "48b1de4c110a",
                     "lessThan": "9cdf299ba4e1",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "48b1de4c110a",
                     "lessThan": "f648089337cb",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "48b1de4c110a",
                     "lessThan": "5fc177ab7594",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/netfilter/nf_synproxy_core.c"
               ],
               "versions": [
                  {
                     "version": "3.12",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "3.12",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.4.274",
                     "lessThanOrEqual": "4.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.9.274",
                     "lessThanOrEqual": "4.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.14.238",
                     "lessThanOrEqual": "4.14.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.196",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.128",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.46",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.12.13",
                     "lessThanOrEqual": "5.12.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.13",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8"
            },
            {
               "url": "https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4"
            },
            {
               "url": "https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1"
            },
            {
               "url": "https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0b"
            },
            {
               "url": "https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98"
            },
            {
               "url": "https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02"
            },
            {
               "url": "https://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96b"
            },
            {
               "url": "https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915"
            }
         ],
         "title": "netfilter: synproxy: Fix out of bounds when parsing TCP options",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-47245",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}