GHSA-W6PJ-FV9F-22WF

Vulnerability from github – Published: 2026-08-12 00:31 – Updated: 2026-08-19 18:32
VLAI
Details

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

libceph: bound get_version reply decode to front len

handle_get_version_reply() uses msg->front_alloc_len as the decode boundary for MON_GET_VERSION_REPLY. That is the size of the reused reply buffer, not the number of bytes actually received.

A truncated reply can therefore pass ceph_decode_need() and decode the second u64 from stale tail bytes left in the buffer by an earlier message, causing an uninitialized memory read.

Use msg->front.iov_len as the receive-side decode boundary, matching other libceph reply handlers and limiting decoding to the bytes that were actually read from the wire.

Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-68433"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-12T00:17:43Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: bound get_version reply decode to front len\n\nhandle_get_version_reply() uses msg-\u003efront_alloc_len as the decode\nboundary for MON_GET_VERSION_REPLY.  That is the size of the reused\nreply buffer, not the number of bytes actually received.\n\nA truncated reply can therefore pass ceph_decode_need() and decode the\nsecond u64 from stale tail bytes left in the buffer by an earlier\nmessage, causing an uninitialized memory read.\n\nUse msg-\u003efront.iov_len as the receive-side decode boundary, matching\nother libceph reply handlers and limiting decoding to the bytes that\nwere actually read from the wire.",
  "id": "GHSA-w6pj-fv9f-22wf",
  "modified": "2026-08-19T18:32:20Z",
  "published": "2026-08-12T00:31:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68433"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d934c934ec746d53fc7e4f53239792647bbae63"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1307028f082756bf453e1889aee9983d30643a4b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/340e0386aa39da181015bee38f309018c335ce16"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e7ebfaa0d14cf50e44041bfde38070d6dbc019f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72a35070fcefa229b1b031aa7482ad3788e18f07"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d60de8253c85a02d0e6194b0735e7a562981a04c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6cbf6878f3a1503c872ba8f1e69a58ee68d8b2e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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