CVE-2024-27840 is a vulnerability in the kernel of Apple iOS and iPadOS that permits an attacker with existing kernel code execution privileges to bypass kernel memory protections. The underlying issue relates to insufficient memory handling in the kernel, which Apple has corrected in updates iOS 16.7.8, iPadOS 16.7.8, iOS 17.5, and iPadOS 17.5, among other OS versions. The vulnerability is classified under CWE-786 (Access of Memory Location Before Start of Buffer) and has a CVSS v3.1 base score of 7.5, reflecting high severity with attack vector local, high attack complexity, and requiring high privileges. The vendor advisory confirms the availability of official fixes and improved memory handling as remediation. There are no known exploits in the wild reported at this time.

An attacker who has already achieved kernel code execution privileges on a vulnerable Apple device may exploit this vulnerability to bypass kernel memory protections. This could potentially allow the attacker to escalate privileges further, compromise system integrity, or execute arbitrary code at the kernel level. The CVSS score of 7.5 indicates a high impact on confidentiality, integrity, and availability of the affected systems. However, exploitation requires prior kernel code execution access, which limits the initial attack surface.

Apple has released official patches addressing this vulnerability in iOS 16.7.8, iPadOS 16.7.8, iOS 17.5, and iPadOS 17.5. Users and administrators should apply these updates promptly to remediate the issue. Since this is a local vulnerability requiring prior kernel code execution, ensuring devices are updated reduces the risk of privilege escalation and kernel memory protection bypass. No additional mitigations are specified by the vendor advisory beyond applying the official fixes.