CVE-2025-21804

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

PCI: rcar-ep: Fix incorrect variable used when calling devm_request_mem_region()

The rcar_pcie_parse_outbound_ranges() uses the devm_request_mem_region()

macro to request a needed resource. A string variable that lives on the

stack is then used to store a dynamically computed resource name, which

is then passed on as one of the macro arguments. This can lead to

undefined behavior.

Depending on the current contents of the memory, the manifestations of

errors may vary. One possible output may be as follows:

$ cat /proc/iomem

30000000-37ffffff :

38000000-3fffffff :

Sometimes, garbage may appear after the colon.

In very rare cases, if no NULL-terminator is found in memory, the system

might crash because the string iterator will overrun which can lead to

access of unmapped memory above the stack.

Thus, fix this by replacing outbound_name with the name of the previously

requested resource. With the changes appli

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References