An out-of-bounds write occurs when mounting certain exFAT volumes. The flaw in the bounds‑checking routine can corrupt memory, leading the operating system to terminate unexpectedly or expose kernel memory contents. This constitutes a kernel integrity breach that could disclose sensitive data or destabilize the system.

Apple macOS Golden Gate 27 is affected. Any device running that release or earlier must be considered vulnerable, as a crafted exFAT image can trigger the fault.

Because the exploit requires mounting a malicious file system, an attacker would need local access or the ability to insert removable media. No CVSS or EPSS data are available and the vulnerability is not listed in the CISA KEV catalog, but the potential for kernel memory exposure makes it a high‑impact concern. Administrators should treat it as a serious, post‑poned vulnerability until a patch is applied.