GHSA-987H-MX48-C6MP

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-15 15:30
VLAI
Details

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

keys: make keyring key-chunk byte order agree with keyring_diff_objects()

keyring_get_key_chunk() loads description bytes into the index chunk low address first, while keyring_diff_objects() numbers the first differing bit from the low end and folds the absolute byte index into the level without removing the inline-prefix offset the level already carries. The two disagree on byte order and bit position, so the array can be told two keys first differ at a bit that does not differ in the chunk the walker uses, letting crafted descriptions collide into one node.

Load the chunk in the order keyring_diff_objects() assumes and drop the inline-prefix length when folding the byte index into the level. This only changes the in-memory ordering used to place keys within a keyring; add, search and read of non-colliding keys are unaffected.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74566"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:18:02Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: make keyring key-chunk byte order agree with keyring_diff_objects()\n\nkeyring_get_key_chunk() loads description bytes into the index chunk low\naddress first, while keyring_diff_objects() numbers the first differing\nbit from the low end and folds the absolute byte index into the level\nwithout removing the inline-prefix offset the level already carries.\nThe two disagree on byte order and bit position, so the array can be\ntold two keys first differ at a bit that does not differ in the chunk\nthe walker uses, letting crafted descriptions collide into one node.\n\nLoad the chunk in the order keyring_diff_objects() assumes and drop the\ninline-prefix length when folding the byte index into the level.  This\nonly changes the in-memory ordering used to place keys within a keyring;\nadd, search and read of non-colliding keys are unaffected.",
  "id": "GHSA-987h-mx48-c6mp",
  "modified": "2026-08-15T15:30:36Z",
  "published": "2026-08-15T15:30:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74566"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d9f16c0b643ceac305526b2e2fe25c2c6166926"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58565eef0f8d861aae92abfb7658458d661cee17"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7269df3e7fcfa308e6a456305162f7788747bdbd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e5397a3fed0dee7779bd084bec3c0584db3c930"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd0f976ef89dce6db458bf75bc2cf51127becc41"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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