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Linux 7.4 Gains AMD PerfOpt, a Speed Boost for Radeon Integrated Graphics
AMD PerfOpt has been merged into the Linux 7.4 kernel. It lets integrated GPUs access system memory without going through the IOMMU, delivering a noticeable boost for AI workloads.
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Linux 7.4 makes a RISC-V memory copy optimization portable
The RISC-V architecture changes have been merged into Linux 7.4. The main one moves the decision to skip software alignment during memory copies to run time, so distribution kernel builds can now use the optimization.
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Linux kernel TCP flaw rated 9.8 still unpatched on Ubuntu and RHEL
A race condition in the Linux kernel's TCP code leads to a use-after-free. Anthropic says its Claude model wrote an exploit for it that gives a remote attacker root.
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Linux 7.4 Sound: "The AI Flood Continues"
Sound subsystem maintainer Takashi Iwai of SUSE notes that AI agents keep churning out patches and uncovering fresh kernel bugs.
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A 37-Year-Old Bug Surfaces: Rooting OpenBSD via Code Older Than BSD Itself
Researchers at Calif gained root on OpenBSD with KARL, SMAP and SMEP enabled by overflowing a counter that had stayed 16-bit since the original BSD sources.
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Linux 7.3-rc7 Is Out, Stable Kernel Expected Next Sunday
Linus Torvalds has published what is hopefully the final release candidate ahead of Linux 7.3. If all goes to plan, the stable kernel should arrive next Sunday.
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Linus Torvalds Turns to Claude Code for Linux Kernel Work
Linux creator Linus Torvalds is leaning further into AI tooling — he is now using Claude Code to work on new kernel features.
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Linux 7.4 Brings AMD Zen 6 BTB Context Isolation
The Linux 7.4 kernel is picking up support for a new AMD Zen 6 security feature — Branch Target Buffer Context Isolation (BTB CTX Isolation).
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Debian ships a record-long list of Linux kernel fixes
Advisory DSA-6528-1 patches hundreds of kernel vulnerabilities that could lead to privilege escalation, denial of service or information leaks. In Debian stable they are fixed in version 6.12.111-1.
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Exploit Published for Unpatched Ubuntu Flaw: Container Escape to Host Root
A use-after-free bug in the Linux kernel's AF_UNIX socket subsystem lets an attacker break out of a container and gain root on the host. The kernel fix shipped on August 6, but Ubuntu has yet to release a patch for any affected LTS release.
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io_uring learns to swap thread identities for the sake of speed
io_uring maintainer Jens Axboe has proposed a radical way to shed the overhead of asynchrony: if an operation ends up blocking anyway, the kernel swaps the "identities" of two threads.
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The Linux 7.4 Kernel Will Open Files for Reading Nearly 40% Faster
A small optimization of the do_open() function in the VFS subsystem, more than two years in the making, promises a noticeable boost in the speed of opening files for reading.
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CISA Adds Three Linux Kernel Vulnerabilities to Its Actively Exploited Catalog
The U.S. agency CISA has added three Linux kernel flaws to its catalog of known exploited vulnerabilities, citing evidence of attacks in the wild. Federal agencies are ordered to remediate them by September 21.
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The Linux Kernel Bids Farewell to Binder in C: Rust Wins
The Linux 7.4 kernel is set to remove the old C implementation of Binder. The Rust version will become the sole option for inter-process communication on Android.
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Four Local Root Vulnerabilities in the Linux Kernel: DirtyAH6, TUNderflow, PPPoEject and DiagSpill
Researcher Asim Manizada has disclosed four vulnerabilities in the Linux kernel that let an unprivileged user gain root. The bugs are between 10 and 21 years old, and the fixes have already landed in the stable branches.
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Linux 7.4 to Speed Up Software RAID: Optimizing xor_gen for AVX-512
The Linux 7.4 kernel will get an AVX-512-rewritten xor_gen() function that noticeably speeds up computing and verifying parity blocks for RAID5 and RAID6.
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EROFS Disables LZ4 Rolling Decompression Over Data Corruption Risk
The developers of the EROFS filesystem have temporarily removed the rolling decompression optimization for LZ4: in rare cases it led to data corruption. The change will land in Linux 7.3.
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Ubuntu 24.04.5 LTS Released with Linux 7.0 Kernel in the HWE Stack
The fifth update to the long-term Ubuntu 24.04 branch brings a fresh hardware enablement stack with the Linux 7.0 kernel and Mesa 26.0 graphics drivers.
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AI wrote “ugly” code, but found the bottlenecks and sped up the Linux kernel build
ARM engineer Lorenzo Stoakes used a language model to uncover single-threaded bottlenecks in the Linux kernel build — and achieved speedups of up to 70% on incremental builds.
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Linux 7.3 Will Disable RandStruct by Default for the Sake of Rust Support
In the Linux 7.3 kernel, the RandStruct protection feature is now turned off by default whenever Rust support is available. The developers made a compromise for the sake of complete build coverage.
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