CVE-2025-39697

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> NFS: Fix a race when updating an existing write<br /> <br /> After nfs_lock_and_join_requests() tests for whether the request is<br /> still attached to the mapping, nothing prevents a call to<br /> nfs_inode_remove_request() from succeeding until we actually lock the<br /> page group.<br /> The reason is that whoever called nfs_inode_remove_request() doesn&amp;#39;t<br /> necessarily have a lock on the page group head.<br /> <br /> So in order to avoid races, let&amp;#39;s take the page group lock earlier in<br /> nfs_lock_and_join_requests(), and hold it across the removal of the<br /> request in nfs_inode_remove_request().