GHSA-PCV5-GX25-24WJ

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:

gue: validate REMCSUM private option length

GUE private flags can indicate that remote checksum offload metadata is present. The private flags field itself is accounted for by guehdr_flags_len(), but guehdr_priv_flags_len() currently returns 0 even when GUE_PFLAG_REMCSUM is set.

This lets a packet with only the private flags field pass validate_gue_flags(), after which gue_remcsum() and gue_gro_remcsum() read the missing REMCSUM start/offset fields from the following bytes.

Account for GUE_PLEN_REMCSUM when GUE_PFLAG_REMCSUM is present so that malformed packets are rejected during option validation.

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-2026-72351"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:08Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngue: validate REMCSUM private option length\n\nGUE private flags can indicate that remote checksum offload metadata is\npresent. The private flags field itself is accounted for by\nguehdr_flags_len(), but guehdr_priv_flags_len() currently returns 0 even\nwhen GUE_PFLAG_REMCSUM is set.\n\nThis lets a packet with only the private flags field pass\nvalidate_gue_flags(), after which gue_remcsum() and gue_gro_remcsum()\nread the missing REMCSUM start/offset fields from the following bytes.\n\nAccount for GUE_PLEN_REMCSUM when GUE_PFLAG_REMCSUM is present so that\nmalformed packets are rejected during option validation.",
  "id": "GHSA-pcv5-gx25-24wj",
  "modified": "2026-08-17T06:33:24Z",
  "published": "2026-08-15T06:32:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72351"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/158b9995d3c87f3b93f5c22df54a12e12a3438b3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a99224c120823987e4d829726f4ecb33e03fc1e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c4de9988e9ddc760b750d6b6e701c35ff60ad14"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a4a1d41c6e901e773bcf795f562a47fa71f692a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/61e78679c7c9ca685bff58e4b6348304dc60aafd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c6876ec1b227261b51803f784c7be1b2242a1a0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d335dcc6f521571d57117b8deeebc940836e5450"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f618cbe9b24cd0202004d2db781d5f80ab77037f"
    }
  ],
  "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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