GHSA-438P-HR89-Q323

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

sctp: auth: verify auth requirement when auth_chunk is NULL

sctp_auth_chunk_verify() returns true unconditionally when chunk->auth_chunk is NULL, silently skipping authentication. This is incorrect when:

  1. skb_clone() failed in the BH receive path, leaving auth_chunk NULL. In sctp_endpoint_bh_rcv() asoc is NULL for new connections, so the early sctp_auth_recv_cid() check cannot catch this.

  2. No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never called and auth_chunk remains NULL.

Fix by checking sctp_auth_recv_cid() when auth_chunk is NULL: if authentication is required, return false to drop the chunk; otherwise continue normally.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-68300"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:19Z",
    "severity": "CRITICAL"
  },
  "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": "GHSA-438p-hr89-q323",
  "modified": "2026-08-19T18:32:13Z",
  "published": "2026-08-10T15:33:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68300"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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