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SinkClose is a high-severity vulnerability in AMD processors caused by improper validation in a model-specific register used in System Management Mode-related configuration. An attacker who already has Ring 0 privileges can abuse the flaw to modify SMM configuration even when the SMI lock is enabled. This undermines protections intended to isolate System Management Mode and can enable execution of attacker-controlled code in the highly privileged Ring -2 / SMM context. Reported exploitation paths include bypassing or weakening protections around SMRAM and TSeg, which can expose sensitive data and permit persistent low-level compromise.
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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.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity AMD processor vulnerability, known as SinkClose, that allows an attacker with kernel-level access to manipulate SMM settings, bypass protections, and achieve code execution at Ring -2 / SMM privilege level.
A high-severity privilege escalation vulnerability in AMD CPUs (EPYC, Ryzen, Threadripper) allowing attackers with kernel-level access to escalate to Ring-2 and modify SMM settings, potentially installing undetectable malware.
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.