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In 2019, researchers published a way to identify which file-backed pages were being accessed on a system using timing information from the page cache, leading to a handful of unpleasant consequences and a change to the design of the mincore() system call. Discussion at the time led to a number of ad-hoc patches to address the problem. The lack of new page-cache attacks suggested that attempts to fix things in a piecemeal fashion had succeeded. Now, however, Sudheendra Raghav Neela, Jonas Juffinger, Lukas Maar, and Daniel Gruss have found a new set of holes in the Linux kernel's page-cache-timing protections that allow the same general class of attack.

Security updates have been issued by Debian (chromium, kernel, and multipart), Fedora (dnf5, dr_libs, easyrpg-player, libmaxminddb, python3.12, strongswan, task, and udisks2), Oracle (.NET 10.0, .NET 8.0, .NET 9.0, gnutls, ImageMagick, kernel, libvpx, mingw-libpng, nginx:1.26, python3.11, and uek-kernel), Red Hat (delve, git-lfs, mingw-libpng, osbuild-composer, and rhc-worker-playbook), SUSE (cjson, curl, dnsdist, libsoup2, postgresql16, postgresql17, postgresql18, python-lxml_html_clean, python-pypdf2, python36, and thunderbird), and Ubuntu (dotnet8, dotnet9, dotnet10, freetype, golang-github-go-git-go-git, golang-golang-x-net, openssh, python-cryptography, sudo, and util-linux).

One of the first changes merged for the upcoming 7.0 release was nullfs, an empty filesystem that cannot actually contain any files. One might logically wonder why the kernel would need such a thing. It turns out, though, that there are places where a null filesystem can come in handy. For 7.0, nullfs will be used to make life a bit easier for init programs; future releases will likely use nullfs to increase the isolation of kernel threads from the init process.

Sasha Levin has announced the release of the 6.19.7 and 6.18.17 stable kernels. As usual, each contains important fixes throughout the tree; users are advised to upgrade.

Security updates have been issued by AlmaLinux (gimp, git-lfs, grafana-pcp, kernel, mysql8.4, nfs-utils, opentelemetry-collector, osbuild-composer, postgresql:16, and python3.12), Debian (imagemagick and netty), Fedora (dr_libs and python-lxml-html-clean), Slackware (libarchive and libxml2), SUSE (busybox, coredns, firefox, freerdp, ghostty, gnutls, go1.25, go1.26, GraphicsMagick, grype, helm, helm3, ImageMagick, perl-Compress-Raw-Zlib, python, python311-lxml_html_clean, python311-PyPDF2, tomcat11, and traefik), and Ubuntu (curl, gimp, and libpng).

Inside this week's LWN.net Weekly Edition:

• Front: Chardet; Linux and age verification; Debian AI; Python lazy imports; Python type-system PEP; PQC HTTPS certificates; MGLRU; Fedora strategy.
• Briefs: LLM vulnerability; NTP security; OpenWrt 25.12.0; SUSE sale; Buildroot 2026.02; digiKam 9.0.0; Rust 1.94.0; Quotes; ...
• Announcements: Newsletters, conferences, security updates, patches, and more.

A recently enacted law in California imposes an age-verification requirement on operating-system providers beginning next year. The language of the Digital Age Assurance Act does not restrict its requirements to proprietary or commercial operating systems; projects like Debian, FreeBSD, Fedora, and others seem to be on the hook just as much as Apple or Microsoft. There is some hope that the law will be amended, but there is no guarantee that it will be. This means that the developer communities behind Linux distributions are having to discuss whether and how to comply with the law with little time and even less legal guidance.

Igalia has announced the Moonforge Linux distribution, based on OpenEmbedded and Yocto.

Moonforge is an operating system framework for Linux devices that simplifies the process of building and maintaining custom operating systems.

It provides a curated collection of Yocto layers and configuration files that help developers generate immutable, maintainable, and easily updatable operating system images.

The goal is to offer the best possible developer experience for teams building embedded Linux products. Moonforge handles the complex aspects of operating system creation, such as system integration, security, updates, and infrastructure, so developers can focus on building and deploying their applications or devices.

There has been ongoing discussion in the Internet Engineering Task Force (IETF) about how to protect internet traffic against future quantum computers. So far, that work has focused on key exchange as the most urgent problem; now, a new IETF working group is looking at adopting post-quantum cryptography for authentication and certificate transparency as well. The main challenge to doing so is the increased size of certificates — around 40 times larger. The techniques that the working group is investigating to reduce that overhead could have efficiency benefits for traditional certificates as well.

Security updates have been issued by AlmaLinux (kernel, kernel-rt, libvpx, nfs-utils, nginx:1.26, osbuild-composer, postgresql, postgresql:12, postgresql:13, postgresql:15, postgresql:16, and python-pyasn1), Debian (imagemagick), Fedora (perl-Crypt-SysRandom-XS and systemd), Mageia (yt-dlp), Oracle (delve, gimp, git-lfs, go-rpm-macros, image-builder, kernel, libpng, libvpx, mysql8.4, nfs-utils, osbuild-composer, postgresql16, postgresql:12, postgresql:13, postgresql:15, postgresql:16, python-pyasn1, python3, python3.12, python3.9, and thunderbird), SUSE (python-aiohttp, python-maturin, python311-pymongo, rclone, and util-linux), and Ubuntu (linux-nvidia, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, and python-geopandas).

The advent of lazy imports in the Python language is upon us, now that PEP 810 ("Explicit lazy imports") was accepted by the steering council and the feature will appear in the upcoming Python 3.15 release in October. There are a number of good reasons, performance foremost, for wanting to defer spending—perhaps wasting—the time to do an import before a needed symbol is used. However, there are also good reasons not to want that behavior, at least in some cases. The tension between those two positions is what led to an earlier PEP rejection, but it is also playing into a recent discussion of the API used to control lazy imports.

Reuters is reporting that private-equity firm EQT may be looking to sell SUSE:

EQT has hired investment bank Arma Partners to sound out a group of private equity investors for a possible sale of the company, said the sources, who requested anonymity to discuss confidential matters. The ​deliberations are at an early stage and there is no certainty that EQT will ​proceed with a transaction, the sources said.

SUSE has traded hands a number of times over the years. Most recently it was acquired by EQT in 2018, was listed on the Frankfurt Stock Exchange in 2021, and then taken private again by EQT in August 2023.

Debian is the latest in an ever-growing list of projects to wrestle (again) with the question of LLM-generated contributions; the latest debate stared in mid-February, after Lucas Nussbaum opened a discussion with a draft general resolution (GR) on whether Debian should accept AI-assisted contributions. It seems to have, mostly, subsided without a GR being put forward or any decisions being made, but the conversation was illuminating nonetheless.

Security updates have been issued by Debian (imagemagick), Fedora (chromium, matrix-synapse, mingw-zlib, perl-Net-CIDR, polkit, and rust-pythonize), Mageia (coturn, firefox, and thunderbird), Oracle (delve, git-lfs, gnutls, go-rpm-macros, image-builder, kernel, libsoup, nfs-utils, nginx:1.24, osbuild-composer, postgresql, thunderbird, udisks2, and valkey), Red Hat (grafana, image-builder, and opentelemetry-collector), SUSE (c3p0 and mchange-commons, corepack24, go1, ImageMagick, python-Flask, tomcat, tomcat10, tomcat11, virtiofsd, and weblate), and Ubuntu (apache2 and yara).

Python has a unique approach to static typing. Python programs can contain type annotations, and even access those annotations at run time, but the annotations aren't evaluated by default. Instead, it is up to external programs to ascribe meaning to those annotations. The annotations themselves can be arbitrary Python expressions, but in practice usually involve using helpers from the built-in typing module, the meanings of which external type-checkers mostly agree upon. Yet the type system implicitly defined by the typing module and common type-checkers is insufficiently powerful to model all of the kinds of dynamic metaprogramming found in real-world Python programs. PEP 827 ("Type Manipulation") aims to add additional capabilities to Python's type system to fix this, but discussion of the PEP has been of mixed sentiment.

Version 9.0.0 of the digiKam photo-management system has been released. "This major version introduces groundbreaking improvements in performance, usability, and workflow efficiency, with a strong focus on modernizing the user interface, enhancing metadata management, and expanding support for new camera models and file formats." Some of the changes include a new survey tool, more advanced search and sorting options, as well as bulk editing of geolocation coordinates.

Security updates have been issued by AlmaLinux (delve, git-lfs, and postgresql16), Fedora (cef, chezmoi, chromium, coturn, erlang-hex_core, firefox, gh, gimp, k9s, keylime, keylime-agent-rust, libsixel, microcode_ctl, nextcloud, nss, perl-Crypt-URandom, pgadmin4, php-zumba-json-serializer, postgresql16-anonymizer, prometheus, python-asyncmy, python3.10, python3.11, python3.9, staticcheck, valkey, and vim), SUSE (chromedriver, chromium, coredns, expat, freetype2-devel, gitea-tea, go1.24-openssl, go1.25-openssl, grpc, gstreamer-rtsp-server, gstreamer-plugins-ugly,, helm, jetty-annotations, kubeshark-cli, libaec, libblkid-devel, libsoup, libxml2, libxslt, NetworkManager-applet-strongswan, podman, python-joserfc, python-Markdown, python-pypdf2, python-tornado, python-uv, python311-Django, python311-joserfc, python311-nltk, roundcubemail, and valkey), and Ubuntu (python3.4, python3.5, python3.6, python3.7, python3.8, python3.9, python3.10, python3.11, python3.12, python3.13, python3.14).

Linus has released 7.0-rc3 for testing. "So it's still pretty early in the release cycle, and it just feels a bit busier than I'd like. But nothing particularly stands out or looks bad."

Geoff Huston looks at the network time protocol, and efforts to secure it, in detail.

NTP operates in the clear, and it is often the case that the servers used by a client are not local. This provides an opportunity for an adversary to disrupt an NTP session, by masquerading as a NTP server, or altering NTP payloads in an effort to disrupt a client's time-of-day clock. Many application-level protocols are time sensitive, including TLS, HTTPS, DNSSEC and NFS. Most Cloud applications rely on a coordinated time to determine the most recent version of a data object. Disrupting time can cause significant chaos in distributed network environments.

While it can be relatively straightforward to secure a TCP-based protocol by adding an initial TLS handshake and operating a TLS shim between TCP and the application traffic, it's not so straightforward to use TLS in place of a UDP-based protocol for NTP. TLS can add significant jitter to the packet exchange. Where the privacy of the UDP payload is essential, then DTLS might conceivably be considered, but in the case of NTP the privacy of the timestamps is not essential, but the veracity and authenticity of the server is important.

NTS, a secured version of NTP, is designed to address this requirement relating to the veracity and authenticity of packets passed from a NTS server to an NTS client. The protocol adds a NTS Key Establishment protocol (NTS-KE) in additional to a conventional NTPv4 UDP packet exchange (RFC 8915).

In early February, members of the Fedora Council met in Tirana, Albania to discuss and set the strategic direction for the Fedora Project. The council has published summaries from its strategy summit, and Fedora Project Leader (FPL) Jef Spaleta, as well as some of the council members, held a video meeting to discuss outcomes from the summit on February 25. Topics included a plan to experiment with Open Collective to raise funds for specific Fedora projects, tools to build image-based editions, and more. Spaleta also explained his model for Fedora governance.