CVE-2026-64220 device property: set fwnode->secondary to NULL in fwnode_init()

What is CVE-2026-64220?

CVE-2026-64220 is a medium-severity vulnerability in Linux kernel, published on 24 Jul 2026. 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:

device property: set fwnode->secondary to NULL in fwnode_init()

If a firmware node is allocated on the stack (for instance: temporary software node whose life-time we control) or on the heap - but using a non-zeroing allocation function - and initialized using fwnode_init(), its secondary pointer will contain uninitalized memory which likely will be neither NULL nor IS_ERR() and so may end up being dereferenced (for example: in dev_to_swnode()). Set fwnode->secondary to NULL on initialization.

Weakness: CWE-908

Which versions are affected by CVE-2026-64220?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-64220?

Apply the vendor's patch.

Is CVE-2026-64220 being exploited?

There is no known exploitation of CVE-2026-64220 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

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

Also known as BELL-CVE-2026-64220, DEBIAN-CVE-2026-64220, GHSA-wjrp-p8qr-8jr3, ROOT-OS-UBUNTU-2204-CVE-2026-64220, UBUNTU-CVE-2026-64220.