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

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-24 · updated 2026-08-13
Weakness: CWE-667

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.

Affected products

Linux kernel: from 6.19.12 before 7.0; from 7.0.1 before 7.0.12; 7.0, 7.0-rc7, 7.1-rc1, 7.1-rc2, 7.1-rc3, 7.1-rc4 (+1) — fixed in 7.0, 7.0.12

How to fix

Upgrade to a fixed version: Linux kernel 7.0, 7.0.12. Check the vendor advisory for mitigations.

References

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