{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "bbd0d59809f923ea2b540cbd781b32110e249f6e"
            },
            {
              "fixed": "a129792b3aef15002746c13522781d92ed3522c3"
            },
            {
              "fixed": "5a022ac51ad83b4ce6c898f4b9eefc65bd26b247"
            },
            {
              "fixed": "6caf0e8590c0bf05a76b0d387726adf3a6f3725c"
            },
            {
              "fixed": "ec2e157fc9678a9bc411305a25aec3fd337d7efb"
            },
            {
              "fixed": "28c5fdce9dd955d2baf5e28987819b6d7cfaf646"
            },
            {
              "fixed": "18957373920caf5cdaf5cf32e5d1d7a99ca7700a"
            },
            {
              "fixed": "83f5031f2a6a49d696eb4cc0898345d12f9c6451"
            },
            {
              "fixed": "8e04823c120b376ef7dab14b60ebf6823aa16c14"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.24"
            },
            {
              "fixed": "5.10.265"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.216"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.183"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.148"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.101"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.42"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68300.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: auth: verify auth requirement when auth_chunk is NULL\n\nsctp_auth_chunk_verify() returns true unconditionally when\nchunk-\u003eauth_chunk is NULL, silently skipping authentication.\nThis is incorrect when:\n\n1. skb_clone() failed in the BH receive path, leaving auth_chunk\n   NULL. In sctp_endpoint_bh_rcv() asoc is NULL for new\n   connections, so the early sctp_auth_recv_cid() check cannot\n   catch this.\n\n2. No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never\n   called and auth_chunk remains NULL.\n\nFix by checking sctp_auth_recv_cid() when auth_chunk is NULL:\nif authentication is required, return false to drop the chunk;\notherwise continue normally.",
  "id": "CVE-2026-68300",
  "modified": "2026-08-21T03:30:09.250501408Z",
  "published": "2026-08-10T12:02:34.168Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18957373920caf5cdaf5cf32e5d1d7a99ca7700a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/28c5fdce9dd955d2baf5e28987819b6d7cfaf646"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5a022ac51ad83b4ce6c898f4b9eefc65bd26b247"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6caf0e8590c0bf05a76b0d387726adf3a6f3725c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83f5031f2a6a49d696eb4cc0898345d12f9c6451"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e04823c120b376ef7dab14b60ebf6823aa16c14"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a129792b3aef15002746c13522781d92ed3522c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ec2e157fc9678a9bc411305a25aec3fd337d7efb"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68300.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68300"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "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": "sctp: auth: verify auth requirement when auth_chunk is NULL"
}