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CVE-2018-3639, also known as Speculative Store Bypass (SSB) or Variant 4, is an industry-wide hardware information-disclosure vulnerability in microprocessors that speculatively execute memory loads before the addresses of older stores are resolved. Under a suitable privileged-code instruction sequence, a speculative load may observe a stale value after a recent write. Although the speculative operation does not retire architecturally, it can alter cache state. A local attacker can use targeted cache-timing analysis to infer data from privileged memory. The issue has affected implementations on x86, including AMD systems, and PowerPC systems.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (3 hidden).
This repository is a proof-of-concept (PoC) exploit for CVE-2018-3639, also known as Speculative Store Bypass (Spectre Variant 4). The main code file, 'spectre.c', implements a side-channel attack that leverages speculative execution vulnerabilities in certain x86 CPUs to leak a secret value from memory. The exploit works by manipulating CPU cache behavior and measuring access times to infer the value of a protected string ('PASSWORD_SPECTRE'). The repository includes a Makefile for building the exploit and a README with usage instructions and references. The attack is purely local and requires execution on a vulnerable Linux system. No network or external endpoints are involved; the only fingerprintable endpoint is the local file 'spectre.c'. The exploit demonstrates the vulnerability but does not provide weaponized or operational payloads beyond proof of concept.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
38 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A CPU speculative execution vulnerability added to Google's mitigation overview in May 2018 and tracked across affected Google products.
A speculative execution vulnerability addressed via SSBD-related mitigations, referenced in Windows mitigation guidance.
A speculative store bypass / speculative-execution information-disclosure vulnerability that can expose privileged memory through cache side channels on affected PowerPC systems.
A speculative store bypass (Spectre Variant 4) information-disclosure flaw in modern x86 AMD processors. An unprivileged local attacker could potentially infer privileged memory contents using a cache side-channel attack.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.