CVE-2026-43681 in macOS
Summary
by MITRE • 07/28/2026
A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. A local user may be able to read kernel memory.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a classic buffer overflow condition that was remediated through enhanced bounds checking mechanisms within the macOS kernel. The flaw existed in the operating system's memory management subsystem where insufficient input validation allowed maliciously crafted data to exceed allocated buffer boundaries. Such vulnerabilities are particularly dangerous because they can be exploited to gain unauthorized access to sensitive kernel memory regions, potentially enabling privilege escalation and system compromise. The issue affected multiple versions of the macos operating system including Sequoia 15.7.8, Sonoma 14.8.8, and Tahoe 26.6, indicating a widespread impact across the platform's ecosystem.
The technical implementation of this vulnerability aligns with common software security flaws categorized under CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows data to overwrite adjacent memory locations. When exploited, the buffer overflow could enable an attacker to read kernel memory contents, potentially exposing sensitive system information such as cryptographic keys, user credentials, or other confidential data stored in privileged memory segments. The local nature of this vulnerability means that exploitation requires prior access to the system, but the potential impact remains severe given the privileged context from which the attack originates.
The operational implications of this vulnerability extend beyond simple memory corruption scenarios, as it represents a significant security gap that could be leveraged for advanced persistent threats or privilege escalation attacks. Attackers with local access could potentially use this flaw to extract kernel memory contents and build more sophisticated exploitation techniques. The fix implemented through improved bounds checking aligns with defensive programming practices recommended in the software security community and addresses fundamental weaknesses in input validation mechanisms. This type of vulnerability is particularly concerning because it affects the core operating system components that provide essential security services.
Organizations should prioritize patching affected systems to mitigate this vulnerability, as the potential for kernel memory disclosure represents a serious threat to system integrity and confidentiality. The remediation approach taken by apple demonstrates proper vulnerability management practices, addressing the root cause through enhanced bounds checking rather than merely applying workarounds or temporary fixes. Security teams should monitor for any indicators of exploitation attempts and ensure that all affected macos systems are updated to the patched versions. This vulnerability serves as a reminder of the critical importance of proper memory management in operating system design and the necessity of continuous security auditing to identify and remediate such fundamental flaws before they can be exploited by malicious actors. The ATT&CK framework would categorize this vulnerability under privilege escalation techniques, specifically targeting the kernel memory access capabilities that enable deeper system compromise.