New Spectre-v2 BTR Attack Leaks Linux Memory Despite Existing Defenses

A group of academics from VUSec and Scuola Superiore Sant'Anna have disclosed details of a new Spectre CPU vulnerability variant that affects Just-In-Time (JIT) engines present in web browsers, language runtimes, and the operating system kernel, across multiple CPU vendors.

The new Spectre-v2 variant has been codenamed Branch Target Reuse (BTR).

"The key insight is that, while modern CPUs

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id: 3330
uid: L79HC
insdate: 2026-09-29 17:10:06
title: New Spectre-v2 BTR Attack Leaks Linux Memory Despite Existing Defenses
additional: A group of academics from VUSec and Scuola Superiore Sant'Anna have disclosed details of a new Spectre CPU vulnerability variant that affects Just-In-Time (JIT) engines present in web browsers, language runtimes, and the operating system kernel, across multiple CPU vendors.

The new Spectre-v2 variant has been codenamed Branch Target Reuse (BTR).

"The key insight is that, while modern CPUs
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