fkie_cve-2025-38704
Vulnerability from fkie_nvd
Published
2025-09-04 16:15
Modified
2025-09-05 17:47
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1c951683a720b17c9ecaad1932bc95b29044611f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cce3d027227c69e85896af9fbc6fa9af5c68f067
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2025-38704",
  "lastModified": "2025-09-05T17:47:24.833",
  "metrics": {},
  "published": "2025-09-04T16:15:39.263",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1c951683a720b17c9ecaad1932bc95b29044611f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cce3d027227c69e85896af9fbc6fa9af5c68f067"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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