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

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
6.1.167, 6.12.43, 6.15.11, 6.16.2, 6.6.130
CVEs
CVE-2025-38704
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 04:25 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 4 Sept 2025, 15:32 UTC

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.

osv:CVE-2025-38704

Kernel

Fixed versions: 6.1.167, 6.6.130, 6.12.43, 6.15.11, 6.16.2

Complete source record
{
  "id": "57c39970ef57141445e5ca05de0530bd421bf220318db1600eb8f91ddbe840db",
  "url": "https://osv.dev/vulnerability/CVE-2025-38704",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "rcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access",
    "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.",
    "evidence": "osv:CVE-2025-38704",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.167",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.130",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.43",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.15.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.16.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-38704",
      "aliases": [
        "CVE-2025-38704"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3a5761dc025da47960755ac64d9fbf1c32e8cd80"
                },
                {
                  "fixed": "b097ae798298885695c339d390b48b4e39619fa7"
                },
                {
                  "fixed": "3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9"
                },
                {
                  "fixed": "cce3d027227c69e85896af9fbc6fa9af5c68f067"
                },
                {
                  "fixed": "1c951683a720b17c9ecaad1932bc95b29044611f"
                },
                {
                  "fixed": "9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d"
                },
                {
                  "fixed": "1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38704.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.0.0"
                },
                {
                  "fixed": "6.1.167"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.130"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.43"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.15.11"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.16.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38704.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.633679409Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-784472.html",
        "https://git.kernel.org/stable/c/1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1",
        "https://git.kernel.org/stable/c/1c951683a720b17c9ecaad1932bc95b29044611f",
        "https://git.kernel.org/stable/c/3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9",
        "https://git.kernel.org/stable/c/9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d",
        "https://git.kernel.org/stable/c/b097ae798298885695c339d390b48b4e39619fa7",
        "https://git.kernel.org/stable/c/cce3d027227c69e85896af9fbc6fa9af5c68f067",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38704.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38704",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38704.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38704",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 518112,
  "published_at": "2025-09-04T15:32:55.718+00:00"
}