Privilege Escalation via CPU Opcode Cache Corruption on AMD Zen 2
CVE-2025-54518 is a hardware/microarchitectural vulnerability affecting AMD Family 17h processors based on the Zen 2 microarchitecture. The issue is described by AMD and Xen as improper isolation of shared resources within the CPU operation/opcode cache, which can allow instructions to be corrupted or executed at a higher privilege level than intended. In Xen’s assessment, this can permit code running at one privilege level to influence instructions executed at another privilege level. In virtualized environments, Xen states that all Xen versions are affected when running on vulnerable Zen 2 CPUs. The issue is referred to in Xen Security Advisory XSA-490 as “x86: CPU Opcode Cache corruption.”
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Improper isolation of shared resources within the CPU operation cache on AMD Zen 2-based products that could enable privilege escalation.
A CPU opcode cache corruption vulnerability affecting certain AMD Fam17h (Zen2) CPUs that can allow code to execute at a higher privilege, including userspace-to-kernel and guest-to-host escalation in Xen environments.
A specific vulnerability affecting AMD Zen 2 processors, discussed in the context of CPU behavior and mitigations/updates for Xen and Linux environments.
The version that knows your environment.
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.