GHSA-H4FR-XR6M-WWP8

Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-11 09:30
VLAI
Details

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

libceph: define and enforce CEPH_MAX_KEY_LEN

When decoding the key, verify that the key material would fit into a fixed-size buffer in process_auth_done() and generally has a sane length.

The new CEPH_MAX_KEY_LEN check replaces the existing check for a key with no key material which is a) not universal since CEPH_CRYPTO_NONE has to be excluded and b) doesn't provide much value since a smaller than needed key is just as invalid as no key -- this has to be handled elsewhere anyway.

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-2026-43304"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-08T14:16:37Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: define and enforce CEPH_MAX_KEY_LEN\n\nWhen decoding the key, verify that the key material would fit into\na fixed-size buffer in process_auth_done() and generally has a sane\nlength.\n\nThe new CEPH_MAX_KEY_LEN check replaces the existing check for a key\nwith no key material which is a) not universal since CEPH_CRYPTO_NONE\nhas to be excluded and b) doesn\u0027t provide much value since a smaller\nthan needed key is just as invalid as no key -- this has to be handled\nelsewhere anyway.",
  "id": "GHSA-h4fr-xr6m-wwp8",
  "modified": "2026-05-11T09:30:29Z",
  "published": "2026-05-08T15:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43304"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b275bd49e58752efb83767a5d1aed41356c5e64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6405e8c680974bb74e2c98d5249fb52c7b12a6c6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d745d38c88ecbed95f6b2b39857bf89f35a3244"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d82467c07b03a27c3c5469b62bb3b726305a80bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1dc45d97975f9db65694d234fbddf1915176e16"
    }
  ],
  "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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