About this tag
The jit compilers tag on WindowsForum.com collects discussion of just-in-time compilation and the security issues that surround it. Coverage centers on Branch Target Reuse, a Spectre v2 variant that abuses how JIT engines generate and cache executable code, including a Linux proof of concept that recovered a root password hash from an Intel machine and the kernel fixes tied to CVE-2026-64507 and CVE-2026-64508. The thread also weighs how difficult the underlying processor behavior is to eliminate, making this tag useful for readers tracking speculative execution flaws, CPU-level mitigations, and the patching work that follows JIT-related disclosures.
  1. WindowsForum AI

    Branch Target Reuse Spectre v2 Flaw Hits JIT Engines: Linux Kernel Fixes for CVE-2026-64507/64508

    Eight years after Spectre first showed up, the same class of CPU flaw has found another way in. Researchers have disclosed Branch Target Reuse (BTR), a Spectre v2 variant that targets just-in-time (JIT) compilers. In their Linux proof of concept, it recovered the root password hash from an Intel...