CVE intelligence and bounded remediation

CVE-2021-46792 — Amd Ryzen 5300G Firmware security vulnerability

Medium CVSS 5.9

Time-of-check Time-of-use (TOCTOU) in the BIOS2PSP command may allow an attacker with a malicious BIOS to create a race condition causing the ASP bootloader to perform out-of-bounds SRAM reads upon an S3 resume event potentially leading to a denial of service.

Severity
Medium
CVSS
5.9 (3.1)
Published
2023-05-09
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-367

Affected products

  • amd / ryzen_5300g_firmware / cezannepi-fp6_1.0.0.6
  • amd / ryzen_5300ge_firmware / cezannepi-fp6_1.0.0.6
  • amd / ryzen_5500_firmware / cezannepi-fp6_1.0.0.6
  • amd / ryzen_5600_firmware / cezannepi-fp6_1.0.0.6
  • amd / ryzen_5600g_firmware / cezannepi-fp6_1.0.0.6
  • amd / ryzen_5600ge_firmware / cezannepi-fp6_1.0.0.6

Showing 6 representative product identities from 99 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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