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

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Summary

CVECVE-2026-64238
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-24 16:16:53 UTC
Updated2026-07-24 16:16:53 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 710abda58055ed5eaa8958107633cc12a365c328 a554dfcd30dd5e41d1d67387b3bb85cea83e12e1 git Not specified
CNA Linux Linux affected 710abda58055ed5eaa8958107633cc12a365c328 a1b836607304f71051f9f9dcccf8b5097b86a1fb git Not specified
CNA Linux Linux affected 28f488e7b327630686378bb1d24e22cfc3fc162d git Not specified
CNA Linux Linux affected 6.19.12 6.20 semver Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a1b836607304f71051f9f9dcccf8b5097b86a1fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a554dfcd30dd5e41d1d67387b3bb85cea83e12e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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