Loading vulnerability…
Alfredo Milani Comparetti SpeedFan 4.33 includes a signed kernel driver, speedfan.sys, that on Microsoft Windows Vista x64 exposes the device \Device\speedfan with IOCTLs that permit unprivileged local users to directly read and write model-specific registers (MSRs). Specifically, the driver exposes IOCTL_RDMSR (0x9C402438) and IOCTL_WRMSR (0x9C40243C) without sufficient access restriction or validation. By issuing these IOCTLs, an attacker can perform arbitrary RDMSR/WRMSR operations, including modification of critical MSRs such as MSR_LSTAR, which controls the 64-bit system-call entry point. This creates a kernel-privileged primitive that can be abused to redirect execution in kernel context, bypass driver-signing protections, and load unsigned code.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Privilege escalation via vulnerable speedfan.sys driver, exploited by InvisiMole to obtain kernel-mode privileges.
A vulnerability in the SpeedFan signed kernel driver that exposes unsafe MSR (Model-Specific Register) access via IOCTLs, enabling attackers to gain kernel-level execution (often used in BYOVD scenarios).
speedfan.sys driver vulnerability used to obtain Windows kernel-mode privileges by InvisiMole.
Privilege escalation vulnerability in the SpeedFan speedfan.sys driver exploited by InvisiMole to gain kernel-mode privileges.
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.