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The vulnerability exists in the `software_node_get_reference_args()` function within the Linux kernel’s software node subsystem, which is used to manage firmware and platform descriptions. Its purpose is to retrieve an array of reference arguments (like phandles) stored as a property for a given software node, where `index` specifies which reference to fetch. The security flaw is an incorrect out-of-bounds (OOB) memory access check. The function aimed to ensure the requested index-th element existed within the property’s data buffer (prop->length). However, the original validation logic was mathematically flawed. It failed to confirm that the property buffer had at least `(index + 1) sizeof(ref)` bytes available. Instead, it used an insufficient check that could incorrectly validate a malformed, shorter property. An attacker with the capability to create or manipulate a malicious software node property could craft data that tricks this check. When the function subsequently attempts to read the reference from the calculated memory location, it reads beyond the allocated buffer boundary. This leads to an OOB read, accessing kernel memory that should be inaccessible. Consequences include potential kernel crash (Denial of Service), exposure of sensitive kernel memory contents (information disclosure), or, in more complex scenarios, it could be leveraged as part of a chain to achieve arbitrary code execution or privilege escalation within the kernel context.
Platform: Linux Kernel
Version: All vulnerable versions
Vulnerability: Out-of-Bounds Access
Severity: Medium
date: 2025-07-10
Prediction: 2025-07-31
What Undercode Say:
Showing bash commands and codes related to the blog and another headings how Exploit:
`uname -r`
`git log –oneline –grep=”CVE-2025-38342″ –all`
` Vulnerable Code Snippet (Conceptual)`
`if (index sizeof(ref) > prop->length) { / Incorrect check /`
` return -EINVAL;`
`}`
`ref = (struct software_node_ref_args )prop->value + index;`
` Patched Code Snippet`
`if ((index + 1) sizeof(ref) > prop->length) { / Correct check /`
` return -EINVAL;`
`}`
how Exploit:
An attacker creates or supplies a malicious software node property with a manipulated `length` value. The flawed OOB check passes incorrectly. The kernel function then reads `struct software_node_ref_args` data from an out-of-bounds memory address. This leads to reading unintended kernel memory, causing a crash or leaking secrets.
Protection from this CVE
Apply the official kernel patch from kernel.org. Update the Linux kernel to a version that includes the fix for this commit. For distributors, apply the security update provided by your vendor (e.g., Canonical, Red Hat). Restrict untrusted users or modules from creating software node properties.
Impact:
Denial of Service (system crash). Information Disclosure (kernel memory leak). Potential privilege escalation if combined with other vulnerabilities.
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Sources:
Reported By: nvd.nist.gov
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