The PHP security team has let it be known that there is a high-stakes security update coming at 14:00 UTC on October 21. "All PHP users are encouraged to prepare now so they can upgrade as soon as the release is available". Anybody running a PHP site probably needs to be prepared for this one.

Setuid (and setgid) binaries have long been a source of headaches, and security vulnerabilities, on Linux systems. They are largely seen as something to be avoided; SUSE's security team, for example, forbids the inclusion of setuid or setgid binaries in packages unless they have been reviewed and explicitly allowed. Thorsten Kukuk wants to go a step further and disallow them entirely. At the 2026 All Systems Go! conference, he spoke about his work to disable setuid system-wide, as well as some of the hurdles that remain.

The work to support block sizes larger than the page size on XFS has been difficult. Many users of XFS run stable kernels, which means that they aren't testing new XFS code as it is released. That has made Daniel Gomez wonder whether adopting Rust for some of the data structures underlying XFS, particularly XArrays, could reduce the number of bugs lurking in the code. At Kangrejos 2026, he led a discussion about the potential problems with converting XArray to Rust. The assembled kernel developers had a number of reasons to be cautious about replacing the XArray code, but Gomez was determined to experiment with the possibility, citing both security and performance improvements.

Mozilla has announced that it has received a report that private keys associated with eight eMudhra intermediate certificates have been compromised:

These keys could allow attackers to issue fraudulent HTTPS certificates for websites they do not control. An attacker who could intercept a user's connection could use those certificates to impersonate websites and potentially read or modify traffic.

Mozilla has blocked the affected certificates using its OneCRL centralized list of revoked certificates, and has updated the trusted certificate list in Network Security Services (NSS) 3.131.1.

There is a single-page site about the compromise that goes into more detail. According to the site the certificates have also been blocked in Chrome since October 17, Apple devices since the 19th, and Microsoft blocked the certificates on the 20th. There is also a table that displays whether a browser or other client still trusts the compromised certificates.

The NetBSD foundation has issued instructions to block the certificates on NetBSD installations. Users of other browsers and operating systems may wish to check for updates or guidance to disable the compromised certificates.

OpenBSD 8.0 has been released. There are many new features, including the addition of hibernate support for arm64, an increase in the kernel virtual address space for amd64 to 512GB, quite a few improvements for the qwx driver that supports Qualcomm WiFi 6 devices, and much more. See the full changelog for details.

Security updates have been issued by AlmaLinux (environment-modules, kernel, pcs, perl-URI, python3.14-urllib3, and webkit2gtk3), Debian (python-django), Fedora (bind, bind-dyndb-ldap, chromium, cifs-utils, curl, haveged, python3.15, qt5-qtbase, rust-rbw, rust-routinator, rust-rustls, xorg-x11-server, and xorg-x11-server-Xwayland), Mageia (firefox, firefox-l10n, nss, flatpak-builder, imagemagick, libpng, libxi, libxpm, libxtst, openssh, postgis, and thunderbird), Oracle (emacs, environment-modules, libsoup, perl-URI, python3.14-urllib3, webkit2gtk3, and xorg-x11-server), Red Hat (go-fdo-client, go-fdo-server, golang, kernel, kernel-rt, openssh, postgresql:16, postgresql:18, and rust-sequoia-sq), SUSE (alsa, AusweisApp, chromedriver, ffmpeg-4, kubernetes, libsoup2, nvidia-open-driver-G07-signed, p11-kit, perl-Net-OAuth, perl-Net-Whois-Raw, pgvector-devel, pi-coding-agent, podman, python, python3, python3-base, python3-doc, python315, python36, thunderbird, and velociraptor), and Ubuntu (cifs-utils, curl, golang-1.22, libxtst, openssh, openssh-gssapi, and php8.5, php8.3, php8.1, php7.4, php7.2, php7.0, php5).