Private Relay activation failure via Kernel logic error
Published Jul 29, 2025 · Updated Apr 2, 2026
A logic error in the Kernel in Apple macOS before 15.6 prevents iCloud Private Relay from activating during concurrent user sessions. The Kernel applies incorrect error handling to the state created when more than one user is logged in, leaving Private Relay inactive. Apple has not published the specific function or operation involved; the consequence is limited to loss of Private Relay protection under that condition.
Summary
What happened
A logic error in the Kernel in Apple macOS before 15.6 prevents iCloud Private Relay from activating during concurrent user sessions. The Kernel applies incorrect error handling to the state created when more than one user is logged in, leaving Private Relay inactive. Apple has not published the specific function or operation involved; the consequence is limited to loss of Private Relay protection under that condition.
The record
- CVE
- CVE-2025-43276
- Published
- Jul 29, 2025
- Updated
- Apr 2, 2026
- Vendor
- Apple
- Product
- macOS
- Classifications
- CWE-367
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 29, 2025CVE publishedPublication date reported by the CVE source.
- Apr 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <15.6
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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