Memory Corruption via Improper Lock State Checking in Apple OS 26.1
CVE-2025-43510 Published on December 12, 2025
A memory corruption issue was addressed with improved lock state checking. This issue is fixed in watchOS 26.1, iOS 18.7.2 and iPadOS 18.7.2, macOS Tahoe 26.1, visionOS 26.1, tvOS 26.1, macOS Sonoma 14.8.2, macOS Sequoia 15.7.2, iOS 26.1 and iPadOS 26.1. A malicious application may cause unexpected changes in memory shared between processes.
Known Exploited Vulnerability
This Apple Multiple Products Improper Locking Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Apple watchOS, iOS, iPadOS, macOS, visionOS, and tvOS contain an improper locking vulnerability that could allow a malicious application to cause unexpected changes in memory shared between processes.
The following remediation steps are recommended / required by April 3, 2026: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vulnerability Analysis
CVE-2025-43510 is exploitable with local system access, requires user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
Improper Locking
The software does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.
Products Associated with CVE-2025-43510
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Affected Versions
Apple macOS:- Version unspecified and below 14.8 is affected.
- Version unspecified and below 26.1 is affected.
- Version unspecified and below 26.1 is affected.
- Version unspecified and below 26.1 is affected.
- Version unspecified and below 26.1 is affected.
- Version unspecified and below 15.7 is affected.
- Version unspecified and below 26.1 is affected.
- Version unspecified and below 18.7 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.