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Miscompilation in cortex-m-rt 0.7.1 and 0.7.2

GHSA-xw5j-gv2g-mjm2

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (cortex-m-rt 0.7.3), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • crates.io cortex-m-rt

    Affected
    >= 0.7.0, < 0.7.3
    Fixed in
    0.7.3

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Version 0.7.1 of the cortex-m-rt crate introduced a regression causing the stack to NOT be eight-byte aligned prior to calling main (or any other specified entrypoint), violating the [stack ABI of AAPCS32], the default ABI used by all Cortex-M targets. This regression is also present in version 0.7.2 of the cortex-m-rt crate. This regression can cause certain compiler optimizations (which assume the eight-byte alignment) to produce incorrect behavior at runtime. This incorrect behavior has been [observed in real-world applications]. It is advised that ALL users of v0.7.1 and v0.7.2 of the cortex-m-rt crate update to the latest version (v0.7.3), AS SOON AS POSSIBLE. Users of v0.7.0 and prior versions of cortex-m-rt are not affected by this regression. It will be necessary to rebuild all affected firmware binaries, and flash or deploy the new firmware binaries to affected devices. [stack ABI of AAPCS32]:…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-xw5j-gv2g-mjm2

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-xw5j-gv2g-mjm2

Advisory: Miscompilation in cortex-m-rt 0.7.1 and 0.7.2
IDs: GHSA-xw5j-gv2g-mjm2
Record: https://patchnext.com/advisories/ghsa-xw5j-gv2g-mjm2 (revision 1, source checked 26 Oct 2026, 15:33 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: cortex-m-rt 0.7.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io cortex-m-rt: affected >= 0.7.0, < 0.7.3; fixed in 0.7.3

## Suggested inspection (read-only)
- crates.io cortex-m-rt: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on cortex-m-rt.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-xw5j-gv2g-mjm2 (GitHub-reviewed advisory GHSA-xw5j-gv2g-mjm2 lists affected ranges: crates.io cortex-m-rt >=0.7.0 <0.7.3)

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