GHSA-FP4G-WH5W-9XF4

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-17 06:33
VLAI
Details

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

keys: fix out-of-bounds read in keyring_get_key_chunk()

For description-level chunks keyring_get_key_chunk() advances the read pointer by level * sizeof(long) past the inline prefix but only bounds-checks the prefix, so a long enough key description is read past its kmemdup(desc, desc_len + 1) allocation. Compute the full byte offset and bounds-check the description against it before reading.

The walk only reaches a description-level chunk when two keys collide through the hash, x, type and domain_tag chunks, so this is reached from an unprivileged add_key(2) with a crafted pair of same-type keys whose index hashes collide; KASAN reports a slab-out-of-bounds read.

Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-74567"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:18:02Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: fix out-of-bounds read in keyring_get_key_chunk()\n\nFor description-level chunks keyring_get_key_chunk() advances the read\npointer by level * sizeof(long) past the inline prefix but only\nbounds-checks the prefix, so a long enough key description is read past\nits kmemdup(desc, desc_len + 1) allocation.  Compute the full byte\noffset and bounds-check the description against it before reading.\n\nThe walk only reaches a description-level chunk when two keys collide\nthrough the hash, x, type and domain_tag chunks, so this is reached from\nan unprivileged add_key(2) with a crafted pair of same-type keys whose\nindex hashes collide; KASAN reports a slab-out-of-bounds read.",
  "id": "GHSA-fp4g-wh5w-9xf4",
  "modified": "2026-08-17T06:33:54Z",
  "published": "2026-08-15T15:30:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74567"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a744838453fb9309ce5a5526d3252e211d60152"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63918731f9ae25b5deb022f118e941e6dddfcef4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8dba33c1e779d0fb9a2acb31e354cf0fc0229111"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1933e03e8c74a018550c31a393b79c4d95bff40"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e9417d21a22ad2ec398e78fcf084b717ce92cf2f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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