GHSA-FJXQ-H4GG-VF5R

Vulnerability from github – Published: 2026-07-19 12:30 – Updated: 2026-07-20 15:31
VLAI
Details

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

pNFS: Fix use-after-free in pnfs_update_layout()

When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(), the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds, pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(), which still references 'lo'. This results in a use-after-free when the tracepoint accesses lo's fields.

Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).

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-2026-63800"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T12:16:52Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix use-after-free in pnfs_update_layout()\n\nWhen hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),\nthe code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,\npnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),\nwhich still references \u0027lo\u0027. This results in a use-after-free when the\ntracepoint accesses lo\u0027s fields.\n\nFix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).",
  "id": "GHSA-fjxq-h4gg-vf5r",
  "modified": "2026-07-20T15:31:46Z",
  "published": "2026-07-19T12:30:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63800"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385"
    }
  ],
  "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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