Linux Kernel: PowerPC Fixes Close Security and Stability Gaps
Linus Torvalds merged a batch of PowerPC fixes addressing a use-after-free and a secure page leak in KVM's Book3S HV code, plus an overflow validation bug in the IOMMU. All three are correctness fixes aimed at hardening virtualization and memory handling on PowerPC systems.
Duration: PT2M16S
Episode overview
This episode is a short developer briefing from Linux Kernel.
It explains recent repository work in plain language.
- Show: Linux Kernel
- Published: 2026-09-17T13:17:24Z
- Audio duration: PT2M16S
Transcript excerpt
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Good day. It's September 17th, 2026, and this is your Linux Kernel briefing.
Today's activity is a single merge, but it carries real weight for anyone running PowerPC virtualization: three targeted fixes from Madhavan Srinivasan's tree, all touching the reliability boundary between the hypervisor and guest memory.
The throughline here is memory safety in KVM's Book3S HV code. One fix closes a use-after-free in the function that emulates a TLB invalidation across all logical partition IDs. Another patches a secure device page leak that could occur when a page-in operation to ultravisor-managed memory fails. Both are the kind…
The third fix, in the IOMMU code, corrects overflow validation in a function that checks I/O bus addresses. That's a boundary-check bug — the kind that, left alone, could let invalid addresses slip past validation and cause bad behavior in DMA translation, which touches directly on device isolation and security.
Commit 238650e ties these together as a single powerpc fixes pull, credited to a group of IBM and Red Hat contributors — Amit Machhiwal, Gautam Menghani, Ritesh Harjani, R Nageswara Sastry, and Shivaprasad Bhat. None of these are feature work. They're…
What…
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