CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's NFSv4 implementation, where a failure during client allocation can lead to a stale pointer being referenced in the callback identifier registry. This flaw may allow an attacker to exploit the stale pointer, potentially leading to unexpected behavior or system instability. Organizations using NFSv4 in their Linux environments should prioritize addressing this vulnerability to mitigate the risk of exploitation.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: NFSv4: remove callback IDR entry on client allocation failure nfs4_alloc_client() allocates an NFSv4.0 callback identifier before it finishes setting up the client. If any later initialization step fails, the error path frees the nfs_client directly with nfs_free_client(). That bypasses nfs_put_client(), which is where the callback IDR entry is removed during normal teardown. A failed allocation can therefore leave cb_ident_idr pointing at a freed nfs_client. A later NFSv4.0 callback lookup by cb_ident would find the stale pointer and take a reference to it. Make the callback IDR removal helper callable by the allocation failure path, and remove the callback identifier before freeing the client. This was found by a local static-analysis checker for publish-before-free lifetime bugs and confirmed by manual inspection.