** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1861238
Title:
Root can lift kernel lockdown via USB/IP
Status in linux package in Ubuntu:
Confirmed
Bug description:
It's possible to turn off kernel lockdown by emulating a USB keyboard
via USB/IP and sending an Alt+SysRq+X key combination through it.
Ubuntu's kernels have USB/IP enabled (CONFIG_USBIP_VHCI_HCD=m and
CONFIG_USBIP_CORE=m) with signed usbip_core and vhci_hcd modules
provided in the linux-extra-modules-* package.
See the PoC here: https://github.com/xairy/unlockdown#method-1-usbip
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