CVE-2025-38704 (GCVE-0-2025-38704)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:32 – Updated: 2026-10-15 01:07
VLAI
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3a5761dc025da47960755ac64d9fbf1c32e8cd80 , < b097ae798298885695c339d390b48b4e39619fa7 (git)
Affected: 3a5761dc025da47960755ac64d9fbf1c32e8cd80 , < 3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9 (git)
Affected: 3a5761dc025da47960755ac64d9fbf1c32e8cd80 , < cce3d027227c69e85896af9fbc6fa9af5c68f067 (git)
Affected: 3a5761dc025da47960755ac64d9fbf1c32e8cd80 , < 1c951683a720b17c9ecaad1932bc95b29044611f (git)
Affected: 3a5761dc025da47960755ac64d9fbf1c32e8cd80 , < 9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d (git)
Affected: 3a5761dc025da47960755ac64d9fbf1c32e8cd80 , < 1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.43 , ≤ 6.12.* (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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                    "version": "V3.1.7",
                    "versionType": "custom"
                  }
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                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
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                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
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                "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
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                    "version": "V3.1.5",
                    "versionType": "custom"
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              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
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                    "status": "affected",
                    "version": "V3.1.7",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
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                    "version": "V3.1.6",
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                "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
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                "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
                "vendor": "Siemens",
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                "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
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                "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
                "vendor": "Siemens",
                "versions": [
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                    "status": "affected",
                    "version": "0",
                    "versionType": "custom"
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                "defaultStatus": "unknown",
                "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
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                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
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                ]
              },
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                "defaultStatus": "unknown",
                "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
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                    "status": "affected",
                    "version": "V3.1.5",
                    "versionType": "custom"
                  }
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              },
              {
                "defaultStatus": "unknown",
                "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.7",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "1936DB45-ECC5-4A1A-A924-0D4E14DFE578",
                    "versionEndExcluding": "6.12.43",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "BC242347-F722-43AE-B910-BE0B22386977",
                    "versionEndExcluding": "6.15.11",
                    "versionStartIncluding": "6.13",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "BD7C087D-2415-4521-B624-30003352F899",
                    "versionEndExcluding": "6.16.2",
                    "versionStartIncluding": "6.16",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nrcu/nocb: Correcci\u00f3n de posible acceso inv\u00e1lido al puntero rdp\u0027s-\u003enocb_cb_kthread\n\nEn la etapa de preparaci\u00f3n de CPU online, si el rdp\u0027s-\u003enocb_cb_kthread correspondiente no existe, ser\u00e1 creado, existe una situaci\u00f3n en la que la creaci\u00f3n de los kthreads rcuop del rdp falla, y luego se des-descarga el rdp de esta CPU, no asigna el puntero rdp-\u003enocb_cb_kthread de esta CPU, pero este rdp\u0027s-\u003enocb_gp_rdp y rdp\u0027s-\u003erdp_gp-\u003enocb_gp_kthread siguen siendo v\u00e1lidos.\n\nEsto causar\u00e1 la operaci\u00f3n de re-descarga posterior de esta CPU offline, que pasar\u00e1 la verificaci\u00f3n condicional y el kthread_unpark() acceder\u00e1 a un puntero rdp\u0027s-\u003enocb_cb_kthread inv\u00e1lido.\n\nEste commit, por lo tanto, usa rdp\u0027s-\u003enocb_gp_kthread en lugar de rdp_gp\u0027s-\u003enocb_gp_kthread para la verificaci\u00f3n de seguridad."
          }
        ],
        "id": "CVE-2025-38704",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-09-04T16:15:39.263",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
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            "url": "https://git.kernel.org/stable/c/1c951683a720b17c9ecaad1932bc95b29044611f"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
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            "url": "https://git.kernel.org/stable/c/9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b097ae798298885695c339d390b48b4e39619fa7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/cce3d027227c69e85896af9fbc6fa9af5c68f067"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:23:09+00:00",
      "cve": "CVE-2025-38704",
      "id": "CVE-2025-38704",
      "initial_release_date": "2025-09-04T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rcu/nocb: Fix possible invalid rdp\u0027s-\u003enocb_cb_kthread pointer access",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38704.json",
      "version": "3"
    }
  }
}



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