ktext: update AppleIGB to Tahoe-compatible fork (v5.11.5)

[ayushere]

What

Updates the AppleIGB link from the deprecated donatengit/AppleIGB (last commit Nov 2022) to ayushere/AppleIGB v5.11.5, which fixes two kernel panic bugs that affect macOS Tahoe 26.x.

Also updates the description to remove the outdated "might have instability issues / stay on Big Sur" note and adds a Tahoe-specific callout.

Why

donatengit/AppleIGB is self-described as deprecated. The upstream Shaneee/AppleIGB (v5.11.4) causes repeated kernel panics on macOS Tahoe 26.x due to two bugs in the Apple-specific driver code:

Bug 1 — TX path mbuf out-of-bounds (panics on Tahoe 26.4 and 26.5)

tcp6_hdr() and igb_tx_csum() walked IPv6 extension headers using ip6++ — a stride of sizeof(struct ip6_hdr) = 40 bytes. Real extension headers have variable lengths; correct stride is (cursor[1] + 1) * 8. No bounds check existed.

macOS Tahoe introduced Probabilistic GZAlloc (PGZ) which places guard pages after mbuf zone elements. The wrong-stride read hits the guard page → type=14 page fault panic:

Zone: mbuf, Kind: out-of-bounds (high confidence), Access: 29 byte(s) past
Kernel Extensions in backtrace: com.amdosx.driver.AppleIGB(5.11.4)

Bug 2 — RX path silent mbuf corruption (panic: mbuf len -3)

igb_add_rx_frag() called mbuf_copyback(MBUF_WAITOK) in interrupt context and silently passed a partially-written, corrupted mbuf to the network stack on failure. Tahoe's stricter mbuf validity check panics on it.

Fix

Both bugs are fixed in ayushere/AppleIGB v5.11.5, built against the macOS 26.5 SDK. Pre-built kext available in releases — drop-in replacement, no config.plist changes needed.

• Repo: https://github.com/ayushere/AppleIGB
• Release: https://github.com/ayushere/AppleIGB/releases/tag/v5.11.5

Changes

-* [AppleIGB](https://github.com/donatengit/AppleIGB/releases)
-  * Required for I211 NICs running on macOS Monterey and above
-  * Might have instability issues on some NICs, recommended to stay on Big Sur and use SmallTree
+* [AppleIGB](https://github.com/ayushere/AppleIGB/releases)
+  * Required for I210/I211 NICs running on macOS Monterey and above
+  * Use the ayushere fork (v5.11.5+) for macOS Tahoe 26.x — fixes kernel panics caused by mbuf out-of-bounds bugs caught by Probabilistic GZAlloc introduced in Tahoe

[Copilot]

Pull request overview

Updates the main kext documentation to recommend the Tahoe-compatible AppleIGB fork and clarify I210/I211 support for Monterey and newer macOS versions.

Changes:

• Repoints the AppleIGB releases link from donatengit to ayushere.
• Updates supported NIC wording from I211 to I210/I211.
• Adds a Tahoe 26.x note about using v5.11.5+ to avoid kernel panics.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.