Framework
KVM is a Linux kernel module enabling the kernel to act as a hypervisor, letting the host run virtual machines via the /dev/kvm interface.
Meta engineers responded to a spike in reported KVM escapes shortly before launching Muse, 404 Media reported in October 2026. The issues were fixed before launch, a dev.to summary says, and no exploit details are public.
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Meta began fixing KVM escapes in its Muse AI agent on August 27, 11 days before launch, an internal post seen by 404 Media shows. Each agent's VM holds its owner's email and account access, so a break-out would reach other users and Meta's own systems.
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Meta found several pre-launch flaws in its Muse AI agent, one of which could let an ordinary user escape its KVM sandbox into internal databases, 404 Media reports. Users give Muse access to their own accounts, so its hypervisor is what keeps each tenant apart from Meta's systems and from other users.
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DigitalOcean Managed Agents brought a paused process back with its in-memory counter intact after more than four minutes, in one developer's independent test. That puts the preview service in a different class from ordinary containers for parking long-lived agents mid-task.
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Linus Torvalds said selftests make up a quarter of the Linux 7.3-rc5 patch by line count, a split he called unusual. A few very large test patches produce that share, so the size of the rc alone gives teams planning for 7.3 little reason to wait.
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The three escapes used a kernel bug disclosed weeks earlier, a libslirp flaw Debian 12 has yet to fix, and 0-days the agent found itself after QEMU was rebuilt from upstream. It is one researcher's account.
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Hyunwoo Kim says a guest can use the bug to run code on the host, and he reports a local-root variant where /dev/kvm is world-openable. Both need ARM64 nested virtualization, a mode that is off by default.
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A dev.to walkthrough for Linux guests on KVM splits a VDS benchmark into three separate measurements, records the environment before anything runs, and treats steal time as a correlation to test against throughput across repeated runs.
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Firecracker's sub-200ms boot is real, but it only counts on a host you are already paying for by the hour, which is why an experimental GitHub Actions runner project stands or falls on its author's scheduler.
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Steal at 32.73% with no idle left means the guest had runnable work and no physical core to run it on. That is the one failure mode neither profiling the backend nor buying a bigger plan can reach.
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In a dev.to writeup, the steal column stayed above 90% after the author moved his workload off the box and cut production traffic, which is the measurement that separates an overloaded app from an oversubscribed host.
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The dual-ISA core runs AArch64 and z/Architecture on the same core with nanosecond switching. x86 is named in the pitch and absent from the silicon, and the uptime arithmetic does not close.
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Encore's crackling drives Firecracker on Linux and Apple's hypervisor on macOS. Getting one set of images to boot on both meant re-implementing much of what Docker and a Linux host do for free.
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Docker VMM replaces the per-platform virtualization under Docker Desktop with one in-house backend. It is beta in v4.86 on Windows and macOS; Linux waits for October's general availability.
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Cuttlefish will not start on Minisforum's CIX P1 desktop because the vendor kernel strips the whole vhost subsystem. The rebuild is not optional, and it is not just a Cuttlefish problem.
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