CVE-2025-38069
Full vulnerability record from the local CVENow database.
Description
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]
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-06-18 10:15:40.090000
Last modified
2026-10-30 13:18:00.617000
View original CVE JSON
{
"id": "CVE-2025-38069",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-06-18T10:15:40.090",
"lastModified": "2026-10-30T13:18:00.617",
"vulnStatus": "Modified",
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"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() ->\n pci_epf_free_space()\n\ndoes not clear the previous assignment to epf_test->reg[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->reg[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->reg[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 liberación 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 deaserción PERST#: Durante la inicialización de EP, pci_epf_test_alloc_space() asigna todos los BAR, que se liberan aún más 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() -> pci_epf_free_space() no borra la asignación previa a epf_test->reg[bar]. Luego, si el host se reinicia, la desasignación PERST# reinicia la secuencia de asignación de BAR con el mismo fallo de asignación (sin ventana de entrada libre), lo que crea una situación de doble liberación, ya que epf_test->reg[bar] se desasignó y sigue siendo distinto de NULL. Por lo tanto, asegúrese de que las invocaciones de pci_epf_alloc_space() y pci_epf_free_space() sean simétricas y, por lo tanto, establezca epf_test->reg[bar] en NULL cuando se libere memoria. [kwilczynski: registro de confirmaciones]"
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"baseScore": 7.8,
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"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
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"availabilityImpact": "HIGH"
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"weaknesses": [
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"source": "[email protected]",
"type": "Primary",
"description": [
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"lang": "en",
"value": "CWE-415"
}
]
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