Race Condition in Linux Kernel SMB Client During Rename Operations
CVE-2025-39825
What is CVE-2025-39825?
A race condition vulnerability has been identified in the SMB client of the Linux kernel during rename operations. This issue arises when a rename request is processed by the server, which simultaneously involves closing any deferred closes and waiting for outstanding I/O operations to complete. As a result, there is an increased window for potential concurrent opens on the target file, which can lead to unintended consequences. To mitigate this issue, the solution involves unhashing the dentry beforehand, which effectively prevents any concurrent opens of the file during the rename process.
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Affected Version(s)
Linux 78c09634f7dc061a3bd09704cdbebb3762a45cdf
Linux 78c09634f7dc061a3bd09704cdbebb3762a45cdf < 24b9ed739c8c5b464d983e12cf308982f3ae93c2
Linux 78c09634f7dc061a3bd09704cdbebb3762a45cdf