CVE-2025-38135 serial: Fix potential null-ptr-deref in mlb_usio_probe()

What is CVE-2025-38135?

CVE-2025-38135 is a medium-severity vulnerability in Debian Debian Linux, published on 3 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

serial: Fix potential null-ptr-deref in mlb_usio_probe()

devm_ioremap() can return NULL on error. Currently, mlb_usio_probe() does not check for this case, which could result in a NULL pointer dereference.

Add NULL check after devm_ioremap() to prevent this issue.

Weakness: CWE-476

Which versions are affected by CVE-2025-38135?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2025-38135?

Apply the vendor's patch.

Is CVE-2025-38135 being exploited?

There is no known exploitation of CVE-2025-38135 in the wild and no public exploit code.

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All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-64571, BELL-CVE-2025-38135, DEBIAN-CVE-2025-38135, GHSA-f5g5-5vvc-5f44, ROOT-OS-DEBIAN-11-CVE-2025-38135, ROOT-OS-DEBIAN-12-CVE-2025-38135 and 3 more.