CVE-2022-48618: Apple Multiple Products Memory Corruption Vulnerability

CVE-2022-48618 is a time-of-check/time-of-use (TOCTOU) memory corruption vulnerability affecting multiple Apple operating systems: iOS, iPadOS, macOS, tvOS, and watchOS. It allows an attacker who already has read and write capabilities to bypass Pointer Authentication. For IT and security teams managing Apple fleets, this matters because Pointer Authentication is a hardware-backed control that helps prevent certain classes of memory corruption from being turned into reliable code execution; a successful bypass can expand an attacker’s foothold on a compromised device. Specifics such as exact fixed builds and attack preconditions must be confirmed against the vendor advisory.

How it works

The underlying weakness is CWE-367, a classic TOCTOU race condition. In this pattern the software checks a condition (for example, the validity or state of a memory object or pointer) and later uses that result, but the window between check and use can be altered by an attacker who can race the check. Here the result is memory corruption that undermines Pointer Authentication. Pointer Authentication codes (PACs) are intended to make it harder for an attacker to forge or reuse pointers; bypassing that protection can let an attacker with existing read/write access manipulate control flow or data structures more freely. The CISA summary does not describe remote unauthenticated exploitation or provide exploit mechanics, so defenders should treat the issue as requiring prior access and should not invent additional attack chains. Confirm the precise trigger conditions and any required privileges in Apple’s advisory.

Am I affected? How to find it in your systems

The vulnerability is present in Apple’s mobile, desktop, set-top, and wearable operating systems. Typical environments include managed iPhones and iPads, Macs used as endpoints or servers, Apple TVs, and Apple Watches enrolled in MDM or used by employees. Inventory steps:

• Query your MDM, Apple Business Manager, or endpoint management console for device models and OS build numbers for iOS, iPadOS, macOS, tvOS, and watchOS.
• On individual Macs, check System Settings (or System Preferences) → General → About, or use the command-line tools that report the OS version and build.
• For mobile devices, use MDM inventory reports or the Settings → General → About screen.
• Compare collected builds against the fixed versions listed in Apple’s security advisory for CVE-2022-48618; do not rely on version ranges published elsewhere.

Because the flaw is a local TOCTOU memory-corruption issue that requires read/write capability, routine network logs alone are unlikely to show exploitation. Look instead for signs of prior compromise that could grant those capabilities: unexpected process crashes, kernel panics, anomalous memory-related diagnostics, or indicators of privilege escalation already present on the device. Enable and review crash reports, unified logs, and any EDR telemetry that surfaces memory-safety or pointer-authentication failures. Confirm detection guidance against the vendor advisory and your EDR vendor’s coverage notes.

How to remediate

Patch first. Apply the security updates Apple released for the affected products, following the vendor’s instructions exactly. CISA’s required action is to apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. After updating:

• Verify the installed build matches a fixed release listed in the advisory.
• Reboot devices where required so the new kernel and system components load.
• For managed fleets, push the update via MDM and confirm compliance with a follow-up inventory scan.
• As general hardening for this class of issue, keep devices on supported OS trains, enforce automatic security updates where policy allows, and limit the ability of untrusted code or users to obtain arbitrary read/write access (for example, through application allow-listing, reduced privileges, and careful review of developer or enterprise profiles).

No additional version numbers or CVSS scores are stated in the provided facts; always cross-check the advisory for the definitive list of fixed releases.

If you can't patch immediately

Until the vendor update can be applied, reduce risk with compensating controls appropriate to a local TOCTOU / memory-corruption issue that needs existing read/write access:

• Segment high-value Apple devices from untrusted networks and restrict lateral movement paths that could deliver the initial access needed to exploit the flaw.
• Where possible, disable or tightly control features that grant broad memory or debugging access (for example, limit developer tools, jailbreak/root detection policies, and unsigned code execution).
• Increase monitoring for post-exploitation activity: unusual process injection, unexpected kernel extensions or system extensions, and anomalous use of privileged APIs.
• Virtual patching or network WAF rules have limited value against a local memory-corruption race; focus instead on endpoint controls and rapid patching windows.
• If a device cannot be updated and the risk is unacceptable, remove it from production use as CISA guidance allows when mitigations are unavailable.

Document the temporary controls and set a hard deadline for applying the official update.

If your data may have been exposed

Actively exploited vulnerabilities can lead to device compromise and subsequent data exposure even when ransomware use is not documented for this CVE. If you suspect devices were vulnerable and accessible to an attacker with read/write capability, treat them as potentially compromised: isolate, image for forensics if needed, re-image or restore from a known-good state after patching, and rotate credentials that may have been present on the device. As a quick check for whether associated accounts appear in known breach data, you can run a free exposure scan of your email addresses against public breach corpora. Continue to follow your incident-response playbook and confirm any additional indicators with Apple’s advisory and your own telemetry.