Public bug reported: 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 ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861238 Title: Root can lift kernel lockdown via USB/IP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1861238/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
