CVE-2025-43510: Apple Improper Locking Flaw Exposes Shared Memory Across Six Platforms

CVE ID: CVE-2025-43510 Vendor: Apple Affected Products: watchOS, iOS, iPadOS, macOS, visionOS, tvOS Vulnerability Type: Improper Locking (CWE-667) Attack Vector: Local — requires a malicious application running on the target device CISA KEV Patch Deadline: April 3, 2026 (mandatory for U.S. federal agencies under BOD 22-01)

Vulnerability Description

CVE-2025-43510 is an improper locking vulnerability residing in Apple's kernel-level memory management subsystem. The flaw affects the synchronization mechanisms governing shared memory regions between processes. When locking primitives are applied incorrectly or inconsistently, a malicious application can introduce race conditions that allow it to write to — or otherwise manipulate — memory shared with other processes outside its intended access scope.

The vulnerability requires local code execution to exploit. An attacker must deliver and execute a malicious application on the target device, making the initial access vector a crafted app distributed through a compromised developer account, enterprise provisioning profile, sideloading mechanism, or — on macOS — direct execution by a logged-in user.

The flaw spans all six major Apple operating system families: iOS and iPadOS (iPhones and iPads), macOS (Mac desktops and laptops), watchOS (Apple Watch), tvOS (Apple TV), and visionOS (Apple Vision Pro). The breadth of affected platforms indicates the vulnerable code exists in a shared kernel component rather than a platform-specific subsystem.

Technical Impact

Successful exploitation of CVE-2025-43510 enables an attacker to cause unexpected modifications to memory shared between processes. Practically, this opens several attack paths:

  • Privilege escalation: By corrupting shared memory used by a higher-privileged process, an attacker running as an unprivileged user can manipulate execution flow or data structures in a system-level process, potentially gaining elevated privileges.
  • Process memory corruption: Writing arbitrary data into shared memory regions can cause targeted processes to crash, behave unpredictably, or execute attacker-controlled data as code under the right conditions.
  • System service destabilization: Critical daemons and system services that rely on shared memory for inter-process communication (IPC) can be disrupted, resulting in denial-of-service conditions or service degradation.

The local attack vector limits opportunistic remote exploitation, but enterprise environments face meaningful risk from insider threats, malicious MDM profiles, or supply-chain-compromised applications deployed at scale across managed Apple device fleets.

Real-World Risk Context

CISA has added CVE-2025-43510 to its Known Exploited Vulnerabilities (KEV) catalog, mandating that all U.S. federal civilian executive branch agencies apply patches by April 3, 2026. Inclusion in the KEV catalog confirms active exploitation in the wild, making this a priority remediation item — not a theoretical risk.

Organizations running large fleets of Apple devices through Mobile Device Management (MDM) platforms such as Jamf, Microsoft Intune, or Apple Business Manager should treat this as an active threat. Enterprises that permit employee-owned devices (BYOD) with corporate data access face additional exposure, as those devices may not receive patches on the same timeline as managed endpoints.

Environments running macOS in developer or research contexts — where application restrictions are relaxed and unsigned or locally-signed binaries execute routinely — carry elevated exploitation risk compared to locked-down iOS deployments where app installation is gated through the App Store.

Patching and Mitigation Guidance

1. Apply Apple security updates immediately. Apple has issued patches addressing CVE-2025-43510 across all affected platforms. Push updates to all managed devices through your MDM solution without delay. Verify update compliance using MDM reporting dashboards and flag non-compliant devices for follow-up.

Target platform update channels:

  • iOS / iPadOS: Settings → General → Software Update
  • macOS: System Settings → General → Software Update
  • watchOS: Watch app on paired iPhone → General → Software Update
  • tvOS: Settings → System → Software Updates
  • visionOS: Settings → General → Software Update

2. Restrict application installation vectors. On iOS and iPadOS, enforce App Store-only installation through MDM configuration profiles. Disable developer mode on devices that do not require it. On macOS, enforce Gatekeeper policies and restrict execution to App Store apps or identified developers at minimum. Block enterprise provisioning profiles from unauthorized sources.

3. Audit enrolled device application inventories. Use MDM telemetry to identify applications installed from outside official channels. Remove or quarantine applications that cannot be traced to a vetted source. Flag devices with developer profiles or TestFlight applications for additional review.

4. Monitor for local privilege escalation indicators. SOC teams should configure endpoint detection rules to alert on process privilege escalation events on Apple devices. On macOS, Endpoint Security framework-compatible EDR tools (e.g., CrowdStrike Falcon, SentinelOne, Microsoft Defender for Endpoint on macOS) can surface anomalous process behavior consistent with shared memory abuse.

5. Prioritize federal and government-adjacent environments. Any organization operating under FISMA obligations or contracting with U.S. federal agencies must meet the CISA-mandated April 3, 2026 deadline. Document patching actions and retain compliance evidence.

Summary Table

| Attribute | Detail | |---|---| | CVE | CVE-2025-43510 | | Vendor | Apple | | Platforms | iOS, iPadOS, macOS, watchOS, tvOS, visionOS | | Flaw Type | Improper Locking (CWE-667) | | Attack Vector | Local (malicious application) | | Impact | Memory corruption, privilege escalation, DoS | | CISA KEV | Yes — patch deadline April 3, 2026 | | Fix | Apply Apple platform security updates |