CVE-2023-53711: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-53711 is a vulnerability discovered in the Linux kernel's Network File System (NFS) implementation. The vulnerability was disclosed on October 22, 2025, and affects various Linux kernel versions. The issue relates to potential data corruption in NFS operations when handling subrequests and retransmission of requests (NVD).

The vulnerability stems from a flaw in how the NFS implementation handles subrequests and their retransmission. Specifically, the issue occurs when subrequests are not properly joined back into the head before retransmission, particularly in cases where the server wrote synchronously. The problem also affects O_DIRECT operations, requiring a fix similar to the nfs_cancel_remove_inode() function (Ubuntu).

The primary impact of this vulnerability is potential data corruption in NFS operations. This could affect systems using NFS for file sharing and storage, particularly in scenarios involving synchronous writes and O_DIRECT operations (NVD).

Several Linux distributions have released patches to address this vulnerability. Ubuntu has fixed the issue in multiple kernel versions, including linux-hwe-5.15 (5.15.0-94.104~20.04.1), linux-kvm (5.15.0-1050.55), and linux-azure (5.15.0-1056.64) (Ubuntu).