GHSA-GFFV-4HWX-62GG

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33
VLAI
Details

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

sctp: validate embedded address parameter length

sctp_verify_asconf() and sctp_verify_param() only validate ADD_IP, DEL_IP, and SET_PRIMARY parameters against a fixed minimum size of sizeof(struct sctp_addip_param) + sizeof(struct sctp_paramhdr). This ensures the outer parameter is large enough to contain an embedded address parameter header, but does not verify that the embedded address parameter's declared length fits within the bounds of the outer parameter.

Later, sctp_process_param() and sctp_process_asconf_param() extract the embedded address parameter and pass it to af->from_addr_param(), which uses the address parameter length to parse the variable-length address payload. A malformed peer can therefore advertise an embedded address parameter length that exceeds the remaining bytes in the enclosing parameter.

Validate that addr_param->p.length does not exceed the space available after the sctp_addip_param header before processing the embedded address parameter. Reject malformed parameters when the embedded address length extends beyond the enclosing parameter bounds.

This prevents out-of-bounds reads when parsing malformed parameters carried in INIT or ASCONF processing paths.

Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-74287"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:28Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate embedded address parameter length\n\nsctp_verify_asconf() and sctp_verify_param() only validate ADD_IP, DEL_IP,\nand SET_PRIMARY parameters against a fixed minimum size of sizeof(struct\nsctp_addip_param) + sizeof(struct sctp_paramhdr). This ensures the outer\nparameter is large enough to contain an embedded address parameter header,\nbut does not verify that the embedded address parameter\u0027s declared length\nfits within the bounds of the outer parameter.\n\nLater, sctp_process_param() and sctp_process_asconf_param() extract the\nembedded address parameter and pass it to af-\u003efrom_addr_param(), which uses\nthe address parameter length to parse the variable-length address payload.\nA malformed peer can therefore advertise an embedded address parameter\nlength that exceeds the remaining bytes in the enclosing parameter.\n\nValidate that addr_param-\u003ep.length does not exceed the space available\nafter the sctp_addip_param header before processing the embedded address\nparameter. Reject malformed parameters when the embedded address length\nextends beyond the enclosing parameter bounds.\n\nThis prevents out-of-bounds reads when parsing malformed parameters carried\nin INIT or ASCONF processing paths.",
  "id": "GHSA-gffv-4hwx-62gg",
  "modified": "2026-08-17T06:33:36Z",
  "published": "2026-08-15T06:32:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74287"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06c8bf48505f2fef265931db82d5003d302a347b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c674b20c9cdb54f8a46c88b4d00cadf82b8f0c0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/28ba1d3c956604a89168adfb4c97cfc6c509bba5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a44b2602d57e11e2eb85958d4cd500d14a27d9e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/85f54cf589163a75fa06e37d8c2a4a72824c6dd1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92e4adfee56f32a963ebb105c6cd9a1ed707262a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e9361d0ca55c4af12aac09e2572852fa91046229"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed8605c6f39b9b84f9a4631db6deb25e7f1e973c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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