GHSA-395H-H5JQ-GGP6

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-08 15:31
VLAI?
Details

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

netfilter: xt_tcpmss: check remaining length before reading optlen

Quoting reporter: In net/netfilter/xt_tcpmss.c (lines 53-68), the TCP option parser reads op[i+1] directly without validating the remaining option length.

If the last byte of the option field is not EOL/NOP (0/1), the code attempts to index op[i+1]. In the case where i + 1 == optlen, this causes an out-of-bounds read, accessing memory past the optlen boundary (either reading beyond the stack buffer _opt or the following payload).

Severity ?
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43190"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T12:16:37Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_tcpmss: check remaining length before reading optlen\n\nQuoting reporter:\n  In net/netfilter/xt_tcpmss.c (lines 53-68), the TCP option parser reads\n op[i+1] directly without validating the remaining option length.\n\n  If the last byte of the option field is not EOL/NOP (0/1), the code attempts\n  to index op[i+1]. In the case where i + 1 == optlen, this causes an\n  out-of-bounds read, accessing memory past the optlen boundary\n  (either reading beyond the stack buffer _opt or the\n  following payload).",
  "id": "GHSA-395h-h5jq-ggp6",
  "modified": "2026-05-08T15:31:17Z",
  "published": "2026-05-06T12:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43190"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07a9b32eaae792ff7d0fcac14d8920c937c0a9c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e13d0a37666955b6cfddc0f73cb40ed645b8a05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/735ee8582da3d239eb0c7a53adca61b79fb228b3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8b300f726640c48c3edfe9c453334dd801f4b74e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd5beda7e0e32865e214f28034bb92c1cecff885"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eaedc0bc18be46fe7f58170e967959a932c4f824"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6c412dcfd76b0516d51aa847d8f4c7b70381b09"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f895191dc32c53eaf443b6443fe40945b2f92287"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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