CVE-2025-38069 Information

Jun 19, 2025 cve

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]

Reference

https://git.kernel.org/stable/c/8b83893d1f6c6061a7d58169ecdf9d5ee9f306ee https://git.kernel.org/stable/c/934e9d137d937706004c325fa1474f9e3f1ba10a https://git.kernel.org/stable/c/fe2329eff5bee461ebcafadb6ca1df0cbf5945fd

CNNVD-202506-2204 (Published: 2025-06-18)

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