CVE-2024-56161
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedImproper signature verification in AMD CPU ROM microcode patch loader may allow an attacker with local administrator privilege to load malicious CPU microcode resulting in loss of confidentiality and integrity of a confidential guest running under AMD SEV-SNP.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceImproper signature verification in the AMD CPU ROM microcode patch loader allows a local administrator to load malicious CPU microcode, potentially compromising confidential guests running under AMD SEV-SNP by breaking confidentiality and integrity guarantees.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- High
- Privileges
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify CPU vendorRun 'lscpu' or check system information to confirm the processor is AMD-basedAffected if System uses a non-AMD processor - the vulnerability only applies to AMD CPUs
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Verify SEV-SNP is enabledCheck BIOS/UEFI settings or query SEV-SNP status via 'cat /sys/kernel/debug/sev/status' (Linux) or relevant hypervisor commandsAffected if SEV-SNP is actively enabled and running confidential VMs - the flaw compromises SEV-SNP confidentiality/integrity guarantees
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Check current microcode versionQuery the loaded microcode version using 'dmesg | grep microcode' or 'cat /proc/cpuinfo' on Linux, or check BIOS/firmware version on WindowsAffected if Microcode version is older than AMD-provided patches addressing signature verification flaws
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Review local administrator accessAudit local administrator or root account access, review privileged user lists, and check for unauthorized accounts with administrative rightsAffected if Untrusted or unauthorized local administrators exist - exploitation requires local administrator privileges to load malicious microcode
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Confirm hypervisor support for SEV-SNPCheck hypervisor (e.g., QEMU/KVM, Hyper-V) version and SEV-SNP capability status via hypervisor documentation or 'virsh capabilities' outputAffected if Hypervisor supports SEV-SNP but lacks updated microcode validation - vulnerable to loading improperly signed microcode
A system is affected if it runs on AMD CPU hardware with SEV-SNP enabled and has microcode versions prior to AMD's signature verification fix, combined with any untrusted local administrator access.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply AMD-provided microcode/BIOS firmware updates when available, and strictly limit local administrator access to trusted personnel to reduce exploitation risk.
- Consultation12.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $13,632.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-56161 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-56161 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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