CVE-2025-40159 xsk: Harden userspace-supplied xdp_desc validation

In the Linux kernel, the following vulnerability has been resolved: xsk: Harden userspace-supplied xdpdesc validation Turned out certain clearly invalid values passed in xdpdesc from userspace can pass xp,unalignedvalidatedesc and then lead to UBs or just invalid frames to be queued for xmit...

CVE-2025-40159

CVE-2025-40159 applies to the Linux kernel’s XSK/XDP path. The issue arises from accepting clearly invalid userspace-provided xdp_desc values, allowing validation to pass under certain overflow conditions. Root cause: desc->len can reach values near U32_MAX, and desc->addr (u64) can interac...