MacFix
What's broken in macOS 26 on Apple Silicon (so far)
This page changes as the fleet gets updated and more gets tested — it's a status report, not a one-time review.
On this page
macOS 26.6.2 is the current release, but it's the tail end of the Tahoe line — macOS 27 was announced at WWDC in June 2026 and is due for public release any day now. On the machines in the verification fleet, 26.6.2 has no unresolved regressions specific to Apple Silicon. A small set of narrower, confirmed issues are listed below — none of them apply to typical daily use. This page gets updated in place, not replaced, whenever that changes.
Current status
macOS 26.6.2 (build 25G83) is the current release as of this update. macOS 27 "Golden Gate" was announced at WWDC on June 8, 2026, has been in public beta since July, and is expected to ship publicly within days of this update — at which point it drops Intel support entirely (26.x is the last version with Rosetta 2). If you're reading this after that date and still on 26.x, that's now a legacy branch getting security fixes only, not active development.
Known issues on Apple Silicon
| Issue | Scope | Source |
|---|---|---|
| MacBook Air (M5) and MacBook Pro (M5 Pro/Max) restarted unexpectedly and failed to join 802.1X Wi-Fi with certain content-filtering network extensions active | M5 family only, enterprise/managed networks | Apple's own release notes, fixed in a later Tahoe update |
| Kernel panic under macFUSE (60-second watchdogd/IOMediaBSDClient timeout) | M4 MacBook Pro on 26.2, macFUSE users only | Reported and tracked on the macFUSE GitHub issue tracker |
| Gatekeeper bypass (CVE-2026-64708) and a code-signing enforcement bypass via CloudAttestation (CVE-2026-43813) | All Apple Silicon Macs before the fix | Fixed in the 26.6 security update — apply it if you haven't |
None of these affect ordinary use outside their stated scope. The security fixes are already in 26.6 and later — if your build number is 25G72 or newer, you have them.
What's been checked on this fleet
| Area | Result | Checked |
|---|---|---|
| Thermal management / kernel_task behavior | Normal — see kernel_task high CPU | 2026-09-07 |
| Sleep / power assertions | Normal — see Mac won't sleep | 2026-09-07 |
| External display detection after wake | Normal — see external monitor not detected | 2026-09-07 |
| Xcode Command Line Tools after update | No breakage found on this cycle | 2026-09-07 |
Confirm what you're running
Before assuming a symptom is version-specific, confirm the exact build you're on — "26" covers several point releases with different fixes:
Reads the system
What it does: prints the exact macOS version and build number.
After: nothing changes, this only reads.
sw_versOutput
ProductName: macOS
ProductVersion: 26.6.2
BuildVersion: 25G83Captured live on the verification machine.
Verified on
| Chip | macOS | Verified |
|---|---|---|
| M1 (MacBook Air) | 26.6 | 2026-09-07 |
| M2 Pro (Mac mini) | 26.6 | 2026-09-07 |
| M3 (MacBook Pro) | 26.6.2 | 2026-09-07 |
| M4 (MacBook Pro) | 26.6 | 2026-09-07 |