CVE-2021-26342

3.3 LOW 0.2% exploit odds Fix listed

What it is

In SEV guest VMs, the CPU may fail to flush the Translation Lookaside Buffer (TLB) following a particular sequence of operations that includes creation of a new virtual machine control block (VMCB). The failure to flush the TLB may cause the microcode to use stale TLB translations which may allow for disclosure of SEV guest memory contents. Users of SEV-ES/SEV-SNP guest VMs are not impacted by this vulnerability.

At a glance

Exploitability: Can be exploited locally on the machine with a low-privilege account. Limited direct impact.
Exploit odds: 0.2% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2022-05-11 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:43 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.2% in the next 30 days (EPSS).
Severity: 3.3 LOW (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2022-05-11 17:15 UTC
Last modified: 2026-06-17 03:43 UTC
Exploit probability: 0.2% · EPSS, next 30 days
Record status: Modified

Affected

Amd Epyc 7763 Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 7713p Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 7713 Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 7663 Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 7643 Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 75f3 Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 7543p Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 7543 Firmware < milanpi-sp3_1.0.0.7

Attack profile CVSS 3.1 · 3.3

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
Availability: None

Raw vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-26342.md and follow it. Check whether this project is affected by CVE-2021-26342. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record