{
   "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: conntrack: Make global sysctls readonly in non-init netns\n\nThese sysctls point to global variables:\n- NF_SYSCTL_CT_MAX (&nf_conntrack_max)\n- NF_SYSCTL_CT_EXPECT_MAX (&nf_ct_expect_max)\n- NF_SYSCTL_CT_BUCKETS (&nf_conntrack_htable_size_user)\n\nBecause their data pointers are not updated to point to per-netns\nstructures, they must be marked read-only in a non-init_net ns.\nOtherwise, changes in any net namespace are reflected in (leaked into)\nall other net namespaces. This problem has existed since the\nintroduction of net namespaces.\n\nThe current logic marks them read-only only if the net namespace is\nowned by an unprivileged user (other than init_user_ns).\n\nCommit d0febd81ae77 (\"netfilter: conntrack: re-visit sysctls in\nunprivileged namespaces\") \"exposes all sysctls even if the namespace is\nunpriviliged.\" Since we need to mark them readonly in any case, we can\nforego the unprivileged user check altogether."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "versions": [
                  {
                     "version": "d0febd81ae77",
                     "lessThan": "da50f56e826e",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d0febd81ae77",
                     "lessThan": "68122479c128",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d0febd81ae77",
                     "lessThan": "9b288479f7a9",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d0febd81ae77",
                     "lessThan": "baea536cf51f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d0febd81ae77",
                     "lessThan": "d3598eb3915c",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d0febd81ae77",
                     "lessThan": "fbf85a34ce17",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d0febd81ae77",
                     "lessThan": "671c54ea8c7f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d0febd81ae77",
                     "lessThan": "2671fa4dc010",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "versions": [
                  {
                     "version": "5.7",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.7",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.9.269",
                     "lessThanOrEqual": "4.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.14.233",
                     "lessThanOrEqual": "4.14.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.191",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.120",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.35",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.11.19",
                     "lessThanOrEqual": "5.11.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.12.2",
                     "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/da50f56e826e1db141693297afb99370ebc160dd"
            },
            {
               "url": "https://git.kernel.org/stable/c/68122479c128a929f8f7bdd951cfdc8dd0e75b8f"
            },
            {
               "url": "https://git.kernel.org/stable/c/9b288479f7a901a14ce703938596438559d7df55"
            },
            {
               "url": "https://git.kernel.org/stable/c/baea536cf51f8180ab993e374cb134b5edad25e2"
            },
            {
               "url": "https://git.kernel.org/stable/c/d3598eb3915cc0c0d8cab42f4a6258ff44c4033e"
            },
            {
               "url": "https://git.kernel.org/stable/c/fbf85a34ce17c4cf0a37ee253f4c582bbfb8231b"
            },
            {
               "url": "https://git.kernel.org/stable/c/671c54ea8c7ff47bd88444f3fffb65bf9799ce43"
            },
            {
               "url": "https://git.kernel.org/stable/c/2671fa4dc0109d3fb581bc3078fdf17b5d9080f6"
            }
         ],
         "title": "netfilter: conntrack: Make global sysctls readonly in non-init netns",
         "x_generator": {
            "engine": "bippy-c298863b1525"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-46975",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}