CVE-2026-43754 Overview
CVE-2026-43754 is an information disclosure vulnerability affecting Apple macOS. The flaw allows a local application to leak sensitive kernel state due to insufficient redaction of sensitive information. Apple addressed the issue through improved redaction routines across supported macOS releases.
The vulnerability is classified under [CWE-200] (Exposure of Sensitive Information to an Unauthorized Actor). Exploitation requires local access and user interaction, but successful attacks expose kernel memory contents that adversaries can leverage to bypass mitigations such as kernel address space layout randomization (KASLR).
Critical Impact
A local application may read sensitive kernel state, enabling reconnaissance that supports subsequent privilege escalation and mitigation bypass on unpatched macOS systems.
Affected Products
- Apple macOS Sequoia versions prior to 15.7.8
- Apple macOS Sonoma versions prior to 14.8.8
- Apple macOS Tahoe versions prior to 26.6
Discovery Timeline
- 2026-07-27 - CVE-2026-43754 published to NVD
- 2026-07-29 - Last updated in NVD database
Technical Details for CVE-2026-43754
Vulnerability Analysis
The vulnerability resides in a macOS component that returns data derived from kernel structures to user space. Insufficient redaction of sensitive fields allows a local, unprivileged application to observe kernel state that should remain isolated from user-mode processes.
Exposed kernel state commonly includes pointer values, memory layout artifacts, and internal identifiers. Attackers use this information to defeat address randomization and to build reliable exploitation primitives for other kernel vulnerabilities. Apple resolved the issue by improving how sensitive information is redacted before it crosses the user-kernel boundary.
Exploitation requires code execution on the host, which aligns with the local attack vector and low complexity characteristics of the flaw. No authentication is required, but user interaction is needed to launch or run the malicious application.
Root Cause
The root cause is inadequate sanitization of kernel-originating data returned to user space. Fields containing pointers or memory offsets were not masked, allowing them to reach a caller with lower privileges than the data required.
Attack Vector
An attacker delivers or installs an application on a target macOS system. When executed, the application invokes the affected interface and reads back kernel state that leaks memory layout details. The leaked data is then paired with a separate memory corruption bug to achieve reliable code execution or privilege escalation. Technical specifics are not published by Apple; refer to the Apple Support Document #128067 for advisory details.
Detection Methods for CVE-2026-43754
Indicators of Compromise
- Unexpected user-mode processes issuing repeated queries against kernel diagnostic or statistics interfaces.
- Unsigned or ad-hoc signed macOS applications launched from user-writable locations such as /tmp, /Users/Shared, or ~/Downloads.
- Newly installed launch agents or launch daemons in ~/Library/LaunchAgents or /Library/LaunchDaemons correlated with the above process activity.
Detection Strategies
- Monitor Endpoint Security framework (ES) events for processes calling kernel information APIs at high frequency from non-system binaries.
- Baseline expected consumers of kernel state interfaces and alert on deviations by unsigned or newly seen binaries.
- Correlate application installs with subsequent kernel-interface access to surface reconnaissance behavior preceding privilege escalation attempts.
Monitoring Recommendations
- Track macOS system version telemetry to identify hosts still running builds below 15.7.8, 14.8.8, or 26.6.
- Log and review Gatekeeper and XProtect events for blocked or newly permitted binaries on endpoints.
- Retain process execution and code-signing telemetry for at least 90 days to support retrospective hunting after related kernel CVEs are disclosed.
How to Mitigate CVE-2026-43754
Immediate Actions Required
- Update affected systems to macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, or macOS Tahoe 26.6.
- Inventory macOS hosts and prioritize patching for developer workstations and privileged users whose systems run untrusted third-party code.
- Restrict installation of unsigned applications and enforce Gatekeeper policies through MDM configuration profiles.
Patch Information
Apple published fixes in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. Advisory details are available in Apple Support Document #128067, Apple Support Document #128071, and Apple Support Document #128072.
Workarounds
- No vendor-supplied workaround exists. Apply the referenced macOS updates as the authoritative remediation.
- Reduce exposure by limiting local user privileges and by blocking execution of unsigned binaries through MDM-enforced policy.
- Enable System Integrity Protection (SIP) and verify it remains active on all managed endpoints.
# Verify installed macOS version meets patched build
sw_vers -productVersion
# Confirm System Integrity Protection status
csrutil status
# Trigger available Apple software updates
sudo softwareupdate -ia --restart
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
