On 11 October 2021, Apple released iOS 15.0.2 with a fix for CVE-2021-30883, a vulnerability in IOMobileFrameBuffer which allows kernel code execution, and has been exploited in the wild according to Apple. The bug is also present in iOS 15.1 betas 1, 2 and 3. It was fixed in 14.8.1, 15.0.2, and 15.1b4.
Note that despite also involving IOMFB, this is a different vulnerability than CVE-2021-30807 which was fixed in 14.7.1.
Saar Amar quickly bindiff'd the kernel and wrote a blog post and PoC about this vulnerability.
Unlike CVE-2021-30807, this vulnerability is apparently exploitable from the app sandbox without any special entitlement.
Saar's PoC works on A10X, A11, A12, and A13 devices. Apparently, A14/A15 moved this code to the DCP. A small change to the PoC makes it panic the DCP coprocessor, which then panics the iOS kernel, but this is unlikely to allow exploiting the kernel.
- Tweet from Adam Donenfeld (Zimperium): This has been moved to the display coprocessor (DCP) starting from 15, at least on iPhone 12 (and most probably other ones as well)