Apple has released macOS Sequoia 15.4.1 update

Apple has just released an urgent security update to macOS Sequoia to bring it to version 15.4.1. There are no matching security updates for Sonoma or Ventura.

This is claimed to install more reliably on those M1 and other Macs that struggled or failed to update to 15.4. However, it still terminates early with a kernel panic on some Apple silicon Virtual Machines.

For Apple silicon Macs the download is about 1.8 GB in size, and a mere 840 MB or so for Intel Macs.

This fixes two vulnerabilities in CoreAudio and RPAC that appear to have been exploited already in “an extremely sophisticated attack against targeted individuals on iOS” according to Apple’s security release notes.

macOS 15.4.1 has a build number of 24E263, and Safari is unchanged with a version number of 18.4 (20621.1.15.11.10). There are no changes in iBoot firmware for Apple silicon Macs, nor in firmware for Intel Macs.

Updated 1917 GMT 16 April 2025.