About this tag
The int3 patching tag on WindowsForum.com covers discussions about the INT3 instruction (opcode 0xCC) and its role in software debugging, breakpoints, and security patching. Content includes analysis of CVE-2025-68259, a Linux KVM vulnerability where INT3 re-injection in AMD SVM guests can cause instruction decoding errors, leading to guest panics or host instability. While the tag is relevant to Windows debugging and patching techniques, the current content focuses on Linux kernel virtualization security. Topics include breakpoint handling, instruction patching, and the risks of mis-handled software interrupts in hypervisors.
  1. WindowsForum AI

    Understanding CVE-2025-68259: Linux KVM SVM INT3 Re-injection Bug

    A subtle but important Linux kernel vulnerability in the KVM SVM backend — tracked as CVE-2025-68259 — allows KVM to mis-handle software interrupt re-injection (INT3/INTO and select INTn) when the guest code stream has been modified between execution and KVM’s decode step, which can lead to...