{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "9aaaa56845a06aeabdd597cbe19492dc01f281ec"
            },
            {
              "fixed": "73963a375885d5ccb7def39fd0b4f542e0f343dd"
            },
            {
              "fixed": "47110c3a9ac247b688657337f5981efcfcb240dc"
            },
            {
              "fixed": "84158c2997159df4a0d70cd9c46774512d32a522"
            },
            {
              "fixed": "131ef12057d92b77b636321b7849c69222405a97"
            },
            {
              "fixed": "66339b71f105e6f83e0da3b9583d95077534fe1d"
            },
            {
              "fixed": "eca989eab4b2599dcb02f72140a7c08f08838520"
            },
            {
              "fixed": "2fb0dc7e0099686c4e9d2732745d8a31b18c3628"
            },
            {
              "fixed": "285943c6e7ca309bbea84b253745154241d9788a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "d529d6c9f7e3aaeac13c4948f79799ccb825f29d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.4.14"
            },
            {
              "fixed": "5.5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.5.0"
            },
            {
              "fixed": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.142"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.92"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.34"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64047.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring\n\nWhen an sk_msg scatterlist ring wraps (sg.end \u003c sg.start),\ntls_push_record() chains the tail portion of the ring to the head\nusing sg_chain(). An extra entry in the sg array is reserved for\nthis:\n\n  struct sk_msg_sg {\n        [...]\n        /* The extra two elements:\n         * 1) used for chaining the front and sections when the list becomes\n         *    partitioned (e.g. end \u003c start). The crypto APIs require the\n         *    chaining;\n         * 2) to chain tailer SG entries after the message.\n         */\n        struct scatterlist              data[MAX_MSG_FRAGS + 2];\n\nThe current code uses MAX_SKB_FRAGS + 1 as the ring size:\n\n    sg_chain(\u0026msg_pl-\u003esg.data[msg_pl-\u003esg.start],\n             MAX_SKB_FRAGS - msg_pl-\u003esg.start + 1,\n             msg_pl-\u003esg.data);\n\nThis places the chain pointer at\n\n  sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. =\n  \u0026data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 =\n  data[start + (MAX_SKB_FRAGS - start + 1) - 1] =\n  data[MAX_SKB_FRAGS]\n\ninstead of the true last entry. This is likely due to a \"race\" of\nthe commit under Fixes landing close to\ncommit 031097d9e079 (\"bpf: sk_msg, zap ingress queue on psock down\")\n\nConvert to ARRAY_SIZE and drop the data[start] / - start (as suggested\nby Sabrina).",
  "id": "CVE-2026-64047",
  "modified": "2026-07-22T05:29:37.652545223Z",
  "published": "2026-07-19T15:39:31.960Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/131ef12057d92b77b636321b7849c69222405a97"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/285943c6e7ca309bbea84b253745154241d9788a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2fb0dc7e0099686c4e9d2732745d8a31b18c3628"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47110c3a9ac247b688657337f5981efcfcb240dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66339b71f105e6f83e0da3b9583d95077534fe1d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73963a375885d5ccb7def39fd0b4f542e0f343dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/84158c2997159df4a0d70cd9c46774512d32a522"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eca989eab4b2599dcb02f72140a7c08f08838520"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64047.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64047"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring"
}