ghsa-8f3q-p7pf-m5wj
Vulnerability from github
Published
2025-09-05 18:31
Modified
2025-09-05 18:31
Details

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

rcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access

In the preparation stage of CPU online, if the corresponding the rdp's->nocb_cb_kthread does not exist, will be created, there is a situation where the rdp's rcuop kthreads creation fails, and then de-offload this CPU's rdp, does not assign this CPU's rdp->nocb_cb_kthread pointer, but this rdp's->nocb_gp_rdp and rdp's->rdp_gp->nocb_gp_kthread is still valid.

This will cause the subsequent re-offload operation of this offline CPU, which will pass the conditional check and the kthread_unpark() will access invalid rdp's->nocb_cb_kthread pointer.

This commit therefore use rdp's->nocb_gp_kthread instead of rdp_gp's->nocb_gp_kthread for safety check.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38704"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-04T16:15:39Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu/nocb: Fix possible invalid rdp\u0027s-\u003enocb_cb_kthread pointer access\n\nIn the preparation stage of CPU online, if the corresponding\nthe rdp\u0027s-\u003enocb_cb_kthread does not exist, will be created,\nthere is a situation where the rdp\u0027s rcuop kthreads creation fails,\nand then de-offload this CPU\u0027s rdp, does not assign this CPU\u0027s\nrdp-\u003enocb_cb_kthread pointer, but this rdp\u0027s-\u003enocb_gp_rdp and\nrdp\u0027s-\u003erdp_gp-\u003enocb_gp_kthread is still valid.\n\nThis will cause the subsequent re-offload operation of this offline\nCPU, which will pass the conditional check and the kthread_unpark()\nwill access invalid rdp\u0027s-\u003enocb_cb_kthread pointer.\n\nThis commit therefore use rdp\u0027s-\u003enocb_gp_kthread instead of\nrdp_gp\u0027s-\u003enocb_gp_kthread for safety check.",
  "id": "GHSA-8f3q-p7pf-m5wj",
  "modified": "2025-09-05T18:31:16Z",
  "published": "2025-09-05T18:31:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38704"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c951683a720b17c9ecaad1932bc95b29044611f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cce3d027227c69e85896af9fbc6fa9af5c68f067"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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