Description
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, watchOS 27. An app may be able to cause unexpected system termination or write kernel memory.
Published: 2026-09-14
Score: 5.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Kernel Memory Write Leading to System Crash
Action: Immediate Patch
AI Analysis

Impact

An application can trigger an out-of-bounds write that bypasses bounds checking, resulting in unintended writes to kernel memory. The consequence is unexpected system termination or kernel memory corruption; the CVE does not specify that this leads to arbitrary code execution. Based on the description, the likely attack vector is an application that invokes the vulnerable code path, potentially a malicious or compromised app.

Affected Systems

Affected releases include iOS 26.7 and 27, iPadOS 26.7 and 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, and watchOS 27.

Risk and Exploitability

The CVSS score of 5.5 indicates a medium baseline risk. The EPSS score of <1% suggests a low probability of widespread exploitation at present. The vulnerability is not listed in the CISA KEV catalog. Exploitation would require a malicious or compromised application to invoke the vulnerable code; no public exploits are known, but kernel memory corruption could still destabilize the device.

Generated by OpenCVE AI on September 20, 2026 at 18:35 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest operating system updates for all affected Apple platforms, which include iOS 27, iPadOS 27, macOS 27 or 15.8, macOS 26.7, tvOS 27, visionOS 27, and watchOS 27.
  • Ensure that only applications distributed through the official App Store or certified channels are installed; block side‑loaded or unsigned apps through device management policies.
  • Use MDM or enterprise mobility management to monitor for unexpected kernel panics or crashes and investigate any incidents promptly.

Generated by OpenCVE AI on September 20, 2026 at 18:35 UTC.

Tracking

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Advisories

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History

Sun, 20 Sep 2026 19:00:00 +0000

Type Values Removed Values Added
Title Out-of-Bounds Kernel Memory Write Causing System Crash

Wed, 16 Sep 2026 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Apple ipados
Apple iphone Os
CPEs cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
Vendors & Products Apple ipados
Apple iphone Os

Wed, 16 Sep 2026 10:00:00 +0000

Type Values Removed Values Added
Title Out-of-Bounds Write Leading to Kernel Memory Modification and System Crash in Apple Operating Systems
Weaknesses CWE-119

Tue, 15 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-787
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 15 Sep 2026 09:15:00 +0000

Type Values Removed Values Added
Title Out-of-Bounds Write Leading to Kernel Memory Modification and System Crash in Apple Operating Systems
Weaknesses CWE-119

Tue, 15 Sep 2026 02:00:00 +0000

Type Values Removed Values Added
First Time appeared Apple
Apple ios And Ipados
Apple macos
Apple tvos
Apple visionos
Apple watchos
Vendors & Products Apple
Apple ios And Ipados
Apple macos
Apple tvos
Apple visionos
Apple watchos

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Description An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, watchOS 27. An app may be able to cause unexpected system termination or write kernel memory.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: apple

Published:

Updated: 2026-09-15T15:07:45.300Z

Reserved: 2026-09-01T21:13:17.749Z

Link: CVE-2026-84523

cve-icon Vulnrichment

Updated: 2026-09-15T15:07:19.495Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-14T21:17:28.863

Modified: 2026-09-16T18:26:48.857

Link: CVE-2026-84523

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-20T18:45:02Z

Weaknesses