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GHSA-WFQW-582V-82VH

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

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

net/sched: cls_flow: Dont expose folded kernel pointers

The flow classifier falls back to addr_fold() for fields that are missing from packet headers. In map mode, userspace controls mask, xor, rshift, addend and divisor, and can observe the resulting classid through class statistics. This allows a tc classifier in a user/network namespace to recover the 32-bit folded value of skb->sk, skb_dst() or skb_nfct().

Align with standard kernel practices for pointer hashing and replace the XOR folding with a keyed siphash (which is cryptographically secure)

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74290"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:28Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_flow: Dont expose folded kernel pointers\n\nThe flow classifier falls back to addr_fold() for fields that are missing\nfrom packet headers. In map mode, userspace controls mask, xor, rshift,\naddend and divisor, and can observe the resulting classid through class\nstatistics. This allows a tc classifier in a user/network namespace to\nrecover the 32-bit folded value of skb-\u003esk, skb_dst() or skb_nfct().\n\nAlign with standard kernel practices for pointer hashing and replace the\nXOR folding with a keyed siphash (which is cryptographically secure)",
  "id": "GHSA-wfqw-582v-82vh",
  "modified": "2026-08-15T06:32:28Z",
  "published": "2026-08-15T06:32:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74290"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/19f2ecf8ea564562c7e7a919cf38068dd9aa1c96"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d054001860270748405a3f9270c5fa0bf7ffc19"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6151159618198675e01c391676e579738286c135"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f294fc71c4a0fa4964f6428a1b4e7929c1d83125"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb31fbe51c233f3bf47021121f63d2e42cac2d08"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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