CVE-2025-38069 (GCVE-0-2025-38069)
Vulnerability from cvelistv5
Published
2025-06-18 09:33
Modified
2025-06-18 09:33
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: PCI: endpoint: pci-epf-test: Fix double free that causes kernel to oops Fix a kernel oops found while testing the stm32_pcie Endpoint driver with handling of PERST# deassertion: During EP initialization, pci_epf_test_alloc_space() allocates all BARs, which are further freed if epc_set_bar() fails (for instance, due to no free inbound window). However, when pci_epc_set_bar() fails, the error path: pci_epc_set_bar() -> pci_epf_free_space() does not clear the previous assignment to epf_test->reg[bar]. Then, if the host reboots, the PERST# deassertion restarts the BAR allocation sequence with the same allocation failure (no free inbound window), creating a double free situation since epf_test->reg[bar] was deallocated and is still non-NULL. Thus, make sure that pci_epf_alloc_space() and pci_epf_free_space() invocations are symmetric, and as such, set epf_test->reg[bar] to NULL when memory is freed. [kwilczynski: commit log]
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/endpoint/functions/pci-epf-test.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fe2329eff5bee461ebcafadb6ca1df0cbf5945fd",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "8b83893d1f6c6061a7d58169ecdf9d5ee9f306ee",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "934e9d137d937706004c325fa1474f9e3f1ba10a",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/endpoint/functions/pci-epf-test.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.31",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.31",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: endpoint: pci-epf-test: Fix double free that causes kernel to oops\n\nFix a kernel oops found while testing the stm32_pcie Endpoint driver\nwith handling of PERST# deassertion:\n\nDuring EP initialization, pci_epf_test_alloc_space() allocates all BARs,\nwhich are further freed if epc_set_bar() fails (for instance, due to no\nfree inbound window).\n\nHowever, when pci_epc_set_bar() fails, the error path:\n\n  pci_epc_set_bar() -\u003e\n    pci_epf_free_space()\n\ndoes not clear the previous assignment to epf_test-\u003ereg[bar].\n\nThen, if the host reboots, the PERST# deassertion restarts the BAR\nallocation sequence with the same allocation failure (no free inbound\nwindow), creating a double free situation since epf_test-\u003ereg[bar] was\ndeallocated and is still non-NULL.\n\nThus, make sure that pci_epf_alloc_space() and pci_epf_free_space()\ninvocations are symmetric, and as such, set epf_test-\u003ereg[bar] to NULL\nwhen memory is freed.\n\n[kwilczynski: commit log]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T09:33:46.711Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fe2329eff5bee461ebcafadb6ca1df0cbf5945fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b83893d1f6c6061a7d58169ecdf9d5ee9f306ee"
        },
        {
          "url": "https://git.kernel.org/stable/c/934e9d137d937706004c325fa1474f9e3f1ba10a"
        }
      ],
      "title": "PCI: endpoint: pci-epf-test: Fix double free that causes kernel to oops",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38069",
    "datePublished": "2025-06-18T09:33:46.711Z",
    "dateReserved": "2025-04-16T04:51:23.980Z",
    "dateUpdated": "2025-06-18T09:33:46.711Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38069\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T10:15:40.090\",\"lastModified\":\"2025-06-18T13:46:52.973\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nPCI: endpoint: pci-epf-test: Fix double free that causes kernel to oops\\n\\nFix a kernel oops found while testing the stm32_pcie Endpoint driver\\nwith handling of PERST# deassertion:\\n\\nDuring EP initialization, pci_epf_test_alloc_space() allocates all BARs,\\nwhich are further freed if epc_set_bar() fails (for instance, due to no\\nfree inbound window).\\n\\nHowever, when pci_epc_set_bar() fails, the error path:\\n\\n  pci_epc_set_bar() -\u003e\\n    pci_epf_free_space()\\n\\ndoes not clear the previous assignment to epf_test-\u003ereg[bar].\\n\\nThen, if the host reboots, the PERST# deassertion restarts the BAR\\nallocation sequence with the same allocation failure (no free inbound\\nwindow), creating a double free situation since epf_test-\u003ereg[bar] was\\ndeallocated and is still non-NULL.\\n\\nThus, make sure that pci_epf_alloc_space() and pci_epf_free_space()\\ninvocations are symmetric, and as such, set epf_test-\u003ereg[bar] to NULL\\nwhen memory is freed.\\n\\n[kwilczynski: commit log]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: PCI: endpoint: pci-epf-test: Se corrige la doble liberaci\u00f3n que provoca un error en el kernel. Se corrige un error en el kernel detectado al probar el controlador de endpoint stm32_pcie con el manejo de la deaserci\u00f3n PERST#: Durante la inicializaci\u00f3n de EP, pci_epf_test_alloc_space() asigna todos los BAR, que se liberan a\u00fan m\u00e1s si epc_set_bar() falla (por ejemplo, debido a que no hay una ventana de entrada libre). Sin embargo, cuando pci_epc_set_bar() falla, la ruta de error: pci_epc_set_bar() -\u0026gt; pci_epf_free_space() no borra la asignaci\u00f3n previa a epf_test-\u0026gt;reg[bar]. Luego, si el host se reinicia, la desasignaci\u00f3n PERST# reinicia la secuencia de asignaci\u00f3n de BAR con el mismo fallo de asignaci\u00f3n (sin ventana de entrada libre), lo que crea una situaci\u00f3n de doble liberaci\u00f3n, ya que epf_test-\u0026gt;reg[bar] se desasign\u00f3 y sigue siendo distinto de NULL. Por lo tanto, aseg\u00farese de que las invocaciones de pci_epf_alloc_space() y pci_epf_free_space() sean sim\u00e9tricas y, por lo tanto, establezca epf_test-\u0026gt;reg[bar] en NULL cuando se libere memoria. [kwilczynski: registro de confirmaciones]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/8b83893d1f6c6061a7d58169ecdf9d5ee9f306ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/934e9d137d937706004c325fa1474f9e3f1ba10a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fe2329eff5bee461ebcafadb6ca1df0cbf5945fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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