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CVE-2025-39697 is a race condition in the Linux kernel NFS write path when updating an existing write request. After nfs_lock_and_join_requests() verifies that a request remains attached to its mapping, a concurrent nfs_inode_remove_request() call can remove the request before the page-group lock is acquired. This occurs because the removal caller does not necessarily hold the page-group-head lock. The race can result in use-after-free and kernel instability or crashes. The issue was introduced in Linux kernel 4.14; the correction acquires the page-group lock earlier and holds it throughout request removal.
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A race condition in the Linux kernel's NFS write-request handling caused by insufficient page-group locking. The fix acquires the lock earlier and holds it during request removal. The listed CVSS v3 score is 4.7, indicating a local, high-complexity attack requiring low privileges, with high availability impact and no confidentiality or integrity impact.
A race condition in the Linux kernel's NFS implementation involving write-request updates and removal without adequate page-group locking. The listed CVSS v3 score is 4.7, indicating a local, high-complexity attack requiring low privileges, with high availability impact and no confidentiality or integrity impact. The prescribed fix is to update Echo linux and related packages to version 6.1.153-1 or later.
Linux kernel NFS race condition when updating an existing write.
A Linux kernel NFS race condition vulnerability when updating an existing write.
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