CVE-2026-86903

Kernel Memory Disclosure via an Out‑of‑Bounds Read in Apple Operating Systems

Published Sep 14, 2026 CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Description

An out-of-bounds read was addressed with improved input validation. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27, tvOS 27, visionOS 27, watchOS 27. An app may be able to disclose kernel memory.

Analysis

Technical impact

An out‑of‑bounds read can expose kernel memory to applications. Until the public releases of Apple iOS 27, iPadOS 27, macOS Golden Gate 27, tvOS 27, visionOS 27 and watchOS 27, any app that can trigger the flaw may read sensitive kernel data.

Affected Systems

Apple iOS, iPadOS, macOS, tvOS, visionOS, and watchOS are impacted. All builds prior to the 27 releases contain the issue; the patch is incorporated in the 27 releases and later.

Risk and Exploitability

The EPSS is below 1 % and the vulnerability is not listed in CISA KEV, indicating a low exploitation probability. The CVSS score of 5.5 denotes moderate severity. The likely attack vector is a compromised or malicious application that initiates the out‑of‑bounds read; successful exploitation would leak kernel memory, potentially aiding later attacks. No public exploits are known.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Apple

iOS and iPadOS

affected

Version	Status	Constraints
`0`	affected	< 27

Apple

macOS

affected

Version	Status	Constraints
`0`	affected	< 27

Apple

tvOS

affected

Version	Status	Constraints
`0`	affected	< 27

Apple

visionOS

affected

Version	Status	Constraints
`0`	affected	< 27

Apple

watchOS

affected

Version	Status	Constraints
`0`	affected	< 27

Configuration 1 [-]

OR	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::::::::

No data.

Vendor Product Versions

Apple

Ios And Ipados

Version	Status	Scheme	Platform
`[0,27)`	affected	generic	—

Apple

Macos

Version	Status	Scheme	Platform
`[0,27)`	affected	generic	—

Apple

Tvos

Version	Status	Scheme	Platform
`[0,27)`	affected	generic	—

Apple

Visionos

Version	Status	Scheme	Platform
`[0,27)`	affected	generic	—

Apple

Watchos

Version	Status	Scheme	Platform
`[0,27)`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Update the device to Apple iOS 27, iPadOS 27, macOS Golden Gate 27, tvOS 27, visionOS 27 or watchOS 27, or later releases.
Restart the device after the update to ensure kernel changes take effect.
If the device cannot be updated, restrict it to run only sandboxed applications and consider limiting network access for non‑essential apps.

Generated by OpenCVE AI on September 20, 2026 at 18:53 UTC.

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.158% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://support.apple.com/en-us/149034
https://support.apple.com/en-us/149035
https://support.apple.com/en-us/149036
https://support.apple.com/en-us/149037
https://support.apple.com/en-us/149038

History

Sep 20, 2026 7:15 PM Title updated View changes

Type	Values Removed	Values Added
Title		Kernel Memory Disclosure via an Out‑of‑Bounds Read in Apple Operating Systems

Sep 16, 2026 9:45 AM Title updated View changes

Type	Values Removed	Values Added
Title	Kernel Memory Disclosure via Out‑Of‑Bounds Read in Apple Operating Systems

Sep 16, 2026 1:15 AM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

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

Sep 15, 2026 4:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sep 15, 2026 8:30 AM Title updated. Weaknesses updated View changes

Type	Values Removed	Values Added
Title		Kernel Memory Disclosure via Out‑Of‑Bounds Read in Apple Operating Systems
Weaknesses		CWE-125

Sep 15, 2026 3:30 AM First appearance in the feed. Affected vendors updated View changes

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

Sep 14, 2026 9:00 PM Description updated. Added references View changes

Type	Values Removed	Values Added
Description		An out-of-bounds read was addressed with improved input validation. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27, tvOS 27, visionOS 27, watchOS 27. An app may be able to disclose kernel memory.
References		https://support.apple.com/en-us/149034 https://support.apple.com/en-us/149035 https://support.apple.com/en-us/149036 https://support.apple.com/en-us/149037 https://support.apple.com/en-us/149038