CVE-2024-46801: libfs: fix get_stashed_dentry()

First published: Wed Sep 18 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: libfs: fix get_stashed_dentry() get_stashed_dentry() tries to optimistically retrieve a stashed dentry from a provided location. It needs to ensure to hold rcu lock before it dereference the stashed location to prevent UAF issues. Use rcu_dereference() instead of READ_ONCE() it's effectively equivalent with some lockdep bells and whistles and it communicates clearly that this expects rcu protection.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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