CVE-2025-38704 (GCVE-0-2025-38704)
Vulnerability from cvelistv5
Published
2025-09-04 15:32
Modified
2025-09-29 05:56
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
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/rcu/tree_nocb.h"
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              "operator": "OR"
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      "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:56:23.541Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1"
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      ],
      "title": "rcu/nocb: Fix possible invalid rdp\u0027s-\u003enocb_cb_kthread pointer access",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38704",
    "datePublished": "2025-09-04T15:32:55.718Z",
    "dateReserved": "2025-04-16T04:51:24.032Z",
    "dateUpdated": "2025-09-29T05:56:23.541Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38704\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-04T16:15:39.263\",\"lastModified\":\"2025-09-05T17:47:24.833\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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