UBUNTU-CVE-2026-64238
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.
02 / AFFECTED SOFTWARE
Affected packages
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16 explicit affected versions
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26 explicit affected versions
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13 explicit affected versions
43 explicit affected versions
10 explicit affected versions
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14 explicit affected versions
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78 explicit affected versions
11 explicit affected versions
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/a1b836607304f71051f9f9dcccf8b5097b86a1fb
- https://git.kernel.org/stable/c/a1b836607304f71051f9f9dcccf8b5097b86a1fb
- https://git.kernel.org/stable/c/a554dfcd30dd5e41d1d67387b3bb85cea83e12e1
- https://ubuntu.com/security/CVE-2026-64238
- https://ubuntu.com/security/notices/USN-8618-1
- https://www.cve.org/CVERecord?id=CVE-2026-64238