Python's support for multithreaded programs has improved considerably over the last few years with the advent of the "free-threaded" version of the language. But testing multithreaded programs is notoriously difficult, because the underlying host system determines the thread-execution ordering, which adds an element of non-determinism. At PyCon US, Larry Hastings gave a talk (YouTube video) about his blanket project, which is meant to provide mechanisms for deterministic testing of multithreaded Python code.

Version 2026.09, code-named "Hättiwaritätti", of the Debian-based Grml live Linux distribution for system administrators has been released. It is based on packages from the upcoming Debian 14 ("forky") release. Notable changes include an update to the Linux 7.1.8 kernel, support for booting from exfat-formatted USB devices, and an update to GNU Screen 5.0.1.

Security updates have been issued by Debian (chromium, firefox-esr, and pcre2), Fedora (cockpit, expat, freeipa, kbd, kernel, mrtg, python-pip, and valkey), Mageia (libopenmpt and python-gitpython), Oracle (dbus-broker, freerdp, gegl, gegl04, gimp:2.8, go-fdo-client, go-fdo-server, golang-github-openprinting-ipp-usb, grafana, gzip, image-builder, iperf3, kernel, libssh, libxml2, microcode_ctl, nodejs:22, nodejs:24, openssl-fips-provider, pam, php:7.4, php:8.2, tar, and wget), SUSE (apache2-mod_auth_openidc, apptainer, busybox, cpio, cups-filters, curl, dracut, ffmpeg, file-roller, glibc, grafana, kubevirt, virt-pr-helper-container, lcms2, libtree-sitter0_26, libvirt, postgresql14, postgresql15, postgresql16, postgresql18, suseconnect-ng, terraform-provider-susepubliccloud, and yast2-users), and Ubuntu (FFmpeg, gnupg2, librabbitmq, libssh2, openssh, and spice-vdagent).

Tiered-memory systems are built with multiple types of memory, each of which has different performance characteristics. In addition to the usual DRAM, a tiered system might also provide faster high-bandwidth memory or slower CXL memory. On these systems, the placement of memory allocations has a significant effect on the performance that a workload will obtain. While work on tiered-memory improvements has been ongoing for years, it feels like the pace has slowed a bit recently. Even so, there are a few efforts underway, but they are facing questions about whether the tiering design makes sense.

Version 4.0 of the Audacity audio editor has been released. Notable changes in this release include a rewritten interface using Qt, ability to save user-interface layouts as "Workspaces", improvements in working with audio clips, and a new .aup4 project format.

The release is not fully feature-compatible with the Audacity 3.x series; see the compatibility notes for a list of missing features.

Security updates have been issued by AlmaLinux (freerdp, go-fdo-server, golang-github-openprinting-ipp-usb, kernel, kernel-rt, nodejs:24, perl-DBI, and php), Debian (firefox-esr, libapache2-mod-auth-openidc, and libass), Fedora (dracut, exiv2, firefox, freerdp, gvfs, mingw-expat, mingw-gstreamer1, mingw-gstreamer1-plugins-bad-free, mingw-gstreamer1-plugins-base, mingw-gstreamer1-plugins-good, mingw-openexr, nss, proftpd, and syncthing), Mageia (apr-util, bubblewrap, libalsa2, libarchive, perl-Net-OAuth, perl-Text-CSV_XS, perl-XML-Bare, and perl-YAML-Syck), Oracle (freerdp, gimp, golang, iperf3, nginx:1.24, nodejs:22, nodejs:24, pipewire, wget, xmlrpc-c, and xorg-x11-server-Xwayland), SUSE (apache2-mod_auth_openidc, apptainer, apr-util, bzip2, c-ares, cosign, dhcpcd, dovecot22, emacs, erlang, gegl, gopass, gzip, httpcomponents-client, incus, kernel-devel, libgpg-error, libsoup2, mozillafirefox, mozilla-nss, mozilla-nspr,, MozillaFirefox, mozilla-nss, mozilla-nspr, rust-cbindgen, nodejs20, orthanc, orthanc-authorization, orthanc-postgresql,, postgresql14, python-cryptography, python-msgpack, quagga, snpguest, snphost, texlive, tuxguitar, udisks2, vim, wget, and yast2-users), and Ubuntu (apr-util, biosig, linux, linux-aws, linux-azure, linux-azure-fips, linux-fips, linux-hwe-5.4, linux-ibm, linux-ibm-5.4, linux-iot, linux-kvm, linux-oracle, linux-raspi, linux-raspi-5.4, linux-xilinx-zynqmp, linux-aws-5.15, linux-gcp-5.15, linux-oracle-5.4, sssd, and tika).

Inside this week's LWN.net Weekly Edition:

• Front: Python JIT; rnull block driver; steal time; GNOME governance; 7.3 merge window; LUKS.
• Briefs: Kernel infrastructure; Debian AI; Dolphin 26.08; Firefox 155; Incus 7.4; OpenShot 4.0; Quotes; ...
• Announcements: Newsletters, conferences, security updates, patches, and more.

When a laptop is asleep, its memory is not unreadable. The right tooling can attach to the computer's memory bus and read out its contents, and cold-boot attacks can theoretically read values from memory for a short time after the computer loses power. That is really an unavoidable fact about the hardware, but some users would still like to ensure that, even if this happens, their long-term encryption keys, such as the key for full-disk encryption, remain unreadable. In June 2026, Ingo Blechschmidt discovered that Linux kernel versions after 6.9 (released in May 2024) were not erasing disk-encryption keys when a laptop was put to sleep, even when configured to do so. He quickly identified a potential fix, which has been merged, but it was not a comprehensive solution.

Emmanuele Bassi kicked off a project to improve GNOME's technical governance with a presentation about his ideas (video) at GUADEC 2025. His nudging has led the project to, slowly, work on creating more formal structures for technical governance. It is adopting a teams structure and looking toward creating a steering committee, as well as bootstrapping a Request for Comments (RFC) process. If adopted, GNOME would require RFCs for design, user experience, architectural, and other changes that carry a major impact on the project.

Version 7.4 of the Incus container and virtual-machine management system has been released. Notable changes in this release include UEFI Secure Boot key management, "near-live" migration of containers between Incus instances, as well as burst I/O limits for disk and network devices.

Greg Kroah-Hartman has announced the 7.2.3, 7.1.13, 6.18.49, 6.12.108, 6.6.156, 6.1.187, 5.15.220, and 5.10.269 stable kernels. Each contains a number of important fixes throughout the tree. Users are advised to upgrade.

Note that 7.1.13 is the last of the 7.1 updates

Security updates have been issued by AlmaLinux (dbus-broker, freerdp, gegl, gegl04, gimp, gimp:2.8, glib2, grafana, gzip, iperf3, libssh, nodejs22, nodejs24, nodejs:22, nodejs:24, php:7.4, php:8.2, pipewire, ruby:3.3, ruby:4.0, tar, wget, and xmlrpc-c), Debian (cyrus-imapd, keystone, and lemonldap-ng), Fedora (bubblewrap, cockpit, emacs, gdk-pixbuf2, openssl, openvkl, python-linkify-it-py, python-llm, and rkcommon), Gentoo (Chromium, Google Chrome, Microsoft Edge, Opera, Vivaldi), Oracle (glib2, gzip, mingw-sqlite, nodejs22, xorg-x11-server, and xorg-x11-server-Xwayland), Red Hat (go-toolset:rhel8, golang, and grafana), Slackware (pcre2), SUSE (apache2-mod_auth_openidc, busybox, cups-filters, java-17-openj9, java-1_8_0-openj9, libapr-util1, libgcrypt, python-sqlparse, python3-sqlparse, python313-uv, terraform-provider-aws, terraform-provider-azurerm, terraform-provider-external, terraform-provider-google, terraform-provider-helm, terraform-provider-kubernetes, terraform-provid, ucode-intel, wicked, and yast2-auth-client), and Ubuntu (libevent, libgcrypt20, ncurses, opencryptoki, pam, pyasn1, rust-sudo-rs, and ubuntu-advantage-tools).

The online publication industry, as a whole, is struggling, with challenges coming from multiple directions. Thanks to the support of all of you, our readers, LWN would appear to be doing better than most. But the world has changed around us and, in particular, prices have changed considerably. By now, you probably know where this is going: subscription prices at LWN will be increasing as of September 15.

In 2024 the Python 3.13 release added an experimental just-in-time (JIT) compiler to optimize the way that CPython executes Python code. Since then, work has proceeded on the JIT, albeit perhaps less formally than some might like. In June, Python's steering council (SC) put out an announcement that no new development on the JIT land (with the exception of bug and security fixes) in Python's main branch, until it accepts a Python Enhancement Proposal (PEP) that would make the case for the JIT as a supported part of CPython. That has led to the creation of PEP 836 ("JIT Go Brrr: The Path to a Supported JIT Compiler for CPython"), which is currently under discussion. As it stands, it seems likely that work on JIT will continue, but when that will happen is less certain.

Version 155 of the Firefox web browser has been released. Notable changes include a count in the address bar of how many ad trackers Firefox has blocked, container reordering, and ensuring that mailto: links are only opened by explicit user actions. There is also a change of the domain used for "captive portals" (such as the ones used to sign into hotel WiFI): Firefox now uses "firefox-portal-detection.com" instead of "detectportal.firefox.com", which may require a change in network allow lists.

The release also includes a number of changes that may impact web developers, as well as a number of bug fixes and security fixes.

Security updates have been issued by AlmaLinux (gzip, iperf3, libxml2, mingw-sqlite, mysql:8.4, nginx:1.26, nodejs:24, php, and tar), Debian (expat and libdbd-csv-perl), Fedora (apache-ivy, bind, bluez, bubblewrap, curl, emacs, epiphany, expat, freerdp, gdk-pixbuf2, GitPython, hcloud, kbd, kernel, lego, libopenmpt, mqttcli, nebula, opkssh, python-mkdocs-git-revision-date-localized-plugin, python-pip, rpki-client, rubygem-mechanize, srt, and subfinder), Mageia (c-ares, clamav, expat, mingq-expat, firefox, nspr, nss, flatpak, hplip, jbig2dec, nodejs, openssl, perl-Catalyst-Plugin-Authentication, perl-Date-Manip, perl-HTML-FormHandler, perl-HTTP-Date, perl-Mojolicious, perl-Plack, postgresql15, postgresql18, python-hpack, redis, roundcubemail, thunderbird, varnish, and vim), Oracle (golang and libxml2), Red Hat (bind, bind9.18, dracut, glib2, golang, gzip, kernel, kernel-rt, openssl, osbuild-composer, tar, and unbound), SUSE (7zip, busybox, bzip2, c-ares, chromedriver, chromium, cpio, curl, dhcpcd, dovecot24, dracut, firefox, go1.25, go1.26, go1.26-openssl, google-cloud-sap-agent, gstreamer-plugins-bad, gzip, helm, ImageMagick, istioctl, jfrog-cli, jupyter-jupyterlab, libarchive, libcares2, libheif, liboqs, librest, openssl-1_1, openssl-3, owasp-modsecurity-crs, pcp, php-composer2, postgresql14, postgresql15, postgresql17, postgresql18, python-cryptography, python-httplib2, python-pip, python313, python313-djangorestframework, python313-starlette, qemu, qt6-svg, quagga, rav1e, rmt-server, rsync, rsyslog, snphost, sssd, thunderbird, unbound, vim, wget, xmlrpc-c, yast2-auth-client, and yast2-samba-client), and Ubuntu (attr, bind9, coreutils, cpio, diffutils, freerdp3, libssh, mysql-8.0, mysql-8.4, openjdk-17-crac, openjdk-21-crac, openjdk-25-crac, openssl, p11-kit, perl, pillow, udisks2, util-linux, webkit2gtk, zfs-linux, and zlib).

Version 4.0 of the OpenShot video editor has been released.

OpenShot 4.0 has arrived, bringing some of the biggest creative workflow upgrades in our history. You can now record your screen, webcam, microphone, and system audio directly into a project. You can correct and grade footage with color wheels, curves, LUTs, and professional video scopes. You can also isolate subjects with locally run machine learning models and create everything from animated audio visualizations to cinematic film looks.

See the release notes for a full list of changes.

The Netdev 0x1A conference was held in Rome, Italy from July 13 through July 16. Conference organizer Jami Hadi Salim has let us know that the videos and slides for all sessions are now available. Topics include Linux QUIC, shared memory socket transport, eBPF-based DDoS protection, and more.

By the time Linus Torvalds released 7.3-rc1 and closed the merge window for this release, 15,267 non-merge changesets had been pulled into the mainline repository. That is the second-highest commit count for an -rc1 release in the kernel's history; only the 6.7-rc1 release, which included nearly 3,000 commits of bcachefs history, had more. About 13,000 of those commits entered the mainline after the first 7.3 merge-window summary was written so, needless to say, there are a lot of changes to cover.

Security updates have been issued by Debian (kernel, libarchive, libdbi-perl, libnet-dns-perl, librabbitmq, roundcube, starlette, and xrdp), Fedora (bluez, postgresql16-anonymizer, pyOpenSSL, python-cryptography, python-pynitrokey, and rust-h2), Gentoo (Chromium, Google Chrome, Microsoft Edge, Opera, Freenet, and Tor), Mageia (golang and python-nltk), Red Hat (nodejs22, nodejs24, nodejs:22, and nodejs:24), SUSE (7zip, apptainer, broot, cadvisor, coredns, coturn, distribution-registry, gh, git-lfs, grafana, gzip, java-25-openjdk, libopenssl-3-devel, libsoup-3_0-0, mozjs102, OpenRGB, openssl-3, openvpn, podman, pyenv, python, python-PyPDF2, python310, python312, python313-Authlib, python36, rekor, rsync, rsyslog, tor, trivy, v2ray-core, vim, wget, and wicked), and Ubuntu (bzip2 and openjdk-26).