CVE-2023-53083: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-53083 is a vulnerability discovered in the Linux kernel's Network File System daemon (nfsd). The vulnerability was published on May 2, 2025, and affects the handling of page continuations in the nfsdspliceactor function. This issue was introduced when commit 91e23b1c3982 ('NFSD: Clean up nfsdspliceactor()') removed a critical check in the system (NVD, Wiz).

The vulnerability occurs in the nfsdspliceactor function when handling splice results containing partial pages. When the filesystem returns a short read that doesn't cover the whole page, the function incorrectly manages these partial pages by adding them to the svcrqst->rqpages array multiple times. This improper handling can lead to array corruption, particularly when dealing with splice continuations (Wiz, Debian Tracker).

The exploitation of this vulnerability can result in corruption of the reply structure and potential array overrun, specifically affecting the rqrespages and rqnext_page pointers. This can lead to system instability and potential security implications for systems running affected Linux kernel versions (Wiz).

The vulnerability has been addressed in various Linux distributions. Debian has implemented fixes in versions 5.10.223-1 for bullseye, 6.1.129-1 for bookworm, and 6.12.22-1 for trixie. Security updates have also been released for Ubuntu systems (Debian Tracker).