{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix masking negation logic upon negative dst register\n\nThe negation logic for the case where the off_reg is sitting in the\ndst register is not correct given then we cannot just invert the add\nto a sub or vice versa. As a fix, perform the final bitwise and-op\nunconditionally into AX from the off_reg, then move the pointer from\nthe src to dst and finally use AX as the source for the original\npointer arithmetic operation such that the inversion yields a correct\nresult. The single non-AX mov in between is possible given constant\nblinding is retaining it as it's not an immediate based operation."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "kernel/bpf/verifier.c"
               ],
               "versions": [
                  {
                     "version": "ae03b6b1c880",
                     "lessThan": "4d542ddb88fb",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f92a819b4cbe",
                     "lessThan": "0e2dfdc74a7f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "979d63d50c0c",
                     "lessThan": "53e0db429b37",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "979d63d50c0c",
                     "lessThan": "2cfa537674cd",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "979d63d50c0c",
                     "lessThan": "6eba92a4d4be",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "979d63d50c0c",
                     "lessThan": "7cf64d8679ca",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "979d63d50c0c",
                     "lessThan": "b9b34ddbe207",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "kernel/bpf/verifier.c"
               ],
               "versions": [
                  {
                     "version": "5.0",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.0",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.14.233",
                     "lessThanOrEqual": "4.14.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.190",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.117",
                     "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/4d542ddb88fb2f39bf7f14caa2902f3e8d06f6ba"
            },
            {
               "url": "https://git.kernel.org/stable/c/0e2dfdc74a7f4036127356d42ea59388f153f42c"
            },
            {
               "url": "https://git.kernel.org/stable/c/53e0db429b37a32b8fc706d0d90eb4583ad13848"
            },
            {
               "url": "https://git.kernel.org/stable/c/2cfa537674cd1051a3b8111536d77d0558f33d5d"
            },
            {
               "url": "https://git.kernel.org/stable/c/6eba92a4d4be8feb4dc33976abac544fa99d6ecc"
            },
            {
               "url": "https://git.kernel.org/stable/c/7cf64d8679ca1cb20cf57d6a88bfee79a0922a66"
            },
            {
               "url": "https://git.kernel.org/stable/c/b9b34ddbe2076ade359cd5ce7537d5ed019e9807"
            }
         ],
         "title": "bpf: Fix masking negation logic upon negative dst register",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-46974",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}