CVE-2026-64238 gpio: shared: fix deadlock on shared proxy's parent removal

What is CVE-2026-64238?

CVE-2026-64238 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:

gpio: shared: fix deadlock on shared proxy's parent removal

Commit 710abda58055 ("gpio: shared: call gpio_chip::of_xlate() if set") used the mutex embedded in struct gpio_shared_entry to protect the offset field which now can be modified after assignment. The critical section however is too wide and introduced a potential deadlock on the removal of the shared GPIO proxy's parent.

Make the critical section shorter - only protect the offset when it's being read.

While at it: mention the fact that the entry lock is now also used to protect against concurrent access to the offset field in the structure's documentation.

Weakness: CWE-667

Which versions are affected by CVE-2026-64238?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-64238?

Apply the vendor's patch.

Is CVE-2026-64238 being exploited?

There is no known exploitation of CVE-2026-64238 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 DEBIAN-CVE-2026-64238, GHSA-3qfm-27pw-9j46, ROOT-OS-UBUNTU-2204-CVE-2026-64238, UBUNTU-CVE-2026-64238.