What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-03 · updated 2026-06-17
• Weakness: CWE-476

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.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 5.2 before 5.4.295; from 5.5 before 5.10.239; from 5.11 before 5.15.186; from 5.16 before 6.1.142; from 6.2 before 6.6.94; from 6.7 before 6.12.34 — fixed in 5.10.239, 5.15.186, 5.4.295, 6.1.142, 6.12.34, 6.15.3

How to fix

Upgrade to a fixed version: Linux kernel 5.10.239, 5.15.186, 5.4.295, 6.1.142. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/19fd9f5a69363d33079097d866eb6082d61bf31d
• https://git.kernel.org/stable/c/548b0e81b9a0902a8bc8259430ed965663baadfc
• https://git.kernel.org/stable/c/81159a6b064142b993f2f39828b77e199c77872a
• https://git.kernel.org/stable/c/86bcae88c9209e334b2f8c252f4cc66beb261886
• https://git.kernel.org/stable/c/a05ebe384c7ca75476453f3070c67d9cf1d1a89f
• https://git.kernel.org/stable/c/a6c7c365734cd0fa1c5aa225a6294fdf80cad2ea
• https://git.kernel.org/stable/c/c23d87b43f7dba5eb12820f6cf21a1cd4f63eb3d
• https://git.kernel.org/stable/c/e1b144aebe6fb898d96ced8c990d7aa38fda4a7a
• https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html

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