Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of UMTX_OP_SHM can lead to decreasing the reference count of the object representing the mapping too many times, causing it to be freed too early.

A malicious code exercizing the UMTX_SHM_DESTROY sub-request in parallel can panic the kernel or enable further Use-After-Free attacks, potentially including code execution or Capsicum sandbox escape.

Related CVEs

CVE-2024-43102

Key Information

GHSA ID

GHSA-v72r-7947-x8jx

Published

September 5, 2024 6:31 AM

Last Modified

September 5, 2024 3:33 PM

CVSS Score

9.0 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: November 25, 2025 6:29 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.