GHSA-33W3-5969-WXFC

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32
VLAI
Details

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

libceph: reject zero bucket types in crush_decode

CRUSH bucket type 0 is reserved for devices. The mapper relies on that invariant and uses type 0 to identify leaf devices.

If crush_decode() accepts a bucket with type 0, a malformed CRUSH map can make the mapper treat a negative bucket ID as a device and pass it to is_out(), which then indexes the OSD weight array with a negative value.

Reject zero bucket types while decoding the CRUSH map so the invalid state never reaches the mapper.

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-2026-68154"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:01Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: reject zero bucket types in crush_decode\n\nCRUSH bucket type 0 is reserved for devices.  The mapper relies on\nthat invariant and uses type 0 to identify leaf devices.\n\nIf crush_decode() accepts a bucket with type 0, a malformed CRUSH map\ncan make the mapper treat a negative bucket ID as a device and pass it\nto is_out(), which then indexes the OSD weight array with a negative\nvalue.\n\nReject zero bucket types while decoding the CRUSH map so the invalid\nstate never reaches the mapper.",
  "id": "GHSA-33w3-5969-wxfc",
  "modified": "2026-08-19T18:32:07Z",
  "published": "2026-08-10T15:33:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68154"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/05f90284223381005d6bcddab3fda4a97f9c3401"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/146461f09565afe3665e65b0423d3d6b0fe806c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70998f91030ee083ecb336a1dff0701c20a38081"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80fc40e11cda1b5d990a3f69c6efa344fb5cd987"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/826cd1de5802fd392922785f9b64d76e65d2a100"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/952ca5dc99913d169263f59fd689f586729a13c1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8a9fb6bf806f9c4891e71ae1beab0c07c23a877"
    }
  ],
  "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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