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Phoronix@phoronix@masto.ai (2026-08-06 23:09:05)
Linux Accidentally Left Legacy I/O & Memory Handlers Open In Kernel Lockdown Mode

For nearly the past decade has been the kernel lockdown mode for tightening up kernel access from user-space such as when UEFI Secure Boot is enabled. The kernel lockdown mode restricts PCI BAR access, no writing to /dev/mem, and other restrictions so user-space can't can't modify the running kernel or access sensitive kernel memory. An oversight has allowed legacy I/O and memory interface…
https://www.phoronix.com/news/Linux-Lockdown-Legacy-IO-Mem
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