CVE intelligence and bounded remediation

CVE-2023-20578 — Amd Epyc 8024Pn Firmware security vulnerability

High CVSS 7.5

A TOCTOU (Time-Of-Check-Time-Of-Use) in SMM may allow an attacker with ring0 privileges and access to the BIOS menu or UEFI shell to modify the communications buffer potentially resulting in arbitrary code execution.

Severity
High
CVSS
7.5 (3.1)
Published
2024-08-13
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-367

Affected products

  • amd / epyc_8024pn_firmware
  • amd / epyc_8024p_firmware
  • amd / epyc_8124pn_firmware
  • amd / epyc_8124p_firmware
  • amd / epyc_8224pn_firmware
  • amd / epyc_8224p_firmware

Showing 6 representative product identities from 105 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Race condition, TOCTOU, and lifecycle synchronization

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Check exposure

  • Map concurrent actors, shared state, lock boundaries, signals, callbacks, retries, and check-then-use sequences in the affected path.
  • Determine whether untrusted users can influence timing, object names, filesystem state, or repeated state transitions.
  • Identify clustered and multi-process behavior that repository-local tests may not represent.

Remediate safely

  • Make the sensitive state transition atomic or protect it with a consistently ordered synchronization primitive.
  • Perform authorization and invariant checks on the same authoritative object and transaction used for the operation.
  • Use unique private resources, safe ownership transfer, and idempotent operations; add deterministic concurrency regression tests.

Authoritative sources

Complete CVE record and remediation plan

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