{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsch_cake: Fix out of bounds when parsing TCP options and header\n\nThe TCP option parser in cake qdisc (cake_get_tcpopt and\ncake_tcph_may_drop) could read one byte out of bounds. When the length\nis 1, the execution flow gets into the loop, reads one byte of the\nopcode, and if the opcode is neither TCPOPT_EOL nor TCPOPT_NOP, it reads\none more byte, which exceeds the 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 doff validation in cake_get_tcphdr to avoid parsing garbage as TCP\nheader. Although it wasn't strictly an out-of-bounds access (memory was\nallocated), garbage values could be read where CAKE expected the TCP\nheader if doff was smaller than 5."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/sched/sch_cake.c"
               ],
               "versions": [
                  {
                     "version": "8b7138814f29",
                     "lessThan": "595897ef118d",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "8b7138814f29",
                     "lessThan": "4cefa061fc63",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "8b7138814f29",
                     "lessThan": "3b491dd593d5",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "8b7138814f29",
                     "lessThan": "3371392c60e2",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "8b7138814f29",
                     "lessThan": "ba91c49dedbd",
                     "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/sched/sch_cake.c"
               ],
               "versions": [
                  {
                     "version": "4.19",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "4.19",
                     "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/595897ef118d6fe66690c4fc5b572028c9da95b7"
            },
            {
               "url": "https://git.kernel.org/stable/c/4cefa061fc63f4d2dff5ab4083f43857cd7a2335"
            },
            {
               "url": "https://git.kernel.org/stable/c/3b491dd593d582ceeb27aa617600712a6bd14246"
            },
            {
               "url": "https://git.kernel.org/stable/c/3371392c60e2685af30bd4547badd880f5df2b3f"
            },
            {
               "url": "https://git.kernel.org/stable/c/ba91c49dedbde758ba0b72f57ac90b06ddf8e548"
            }
         ],
         "title": "sch_cake: Fix out of bounds when parsing TCP options and header",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-47243",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}