A flaw was found in KVM. When calling the KVM_GET_DEBUGREGS ioctl, on 32-bit systems, there might be some uninitialized portions of the kvm_debugregs structure that could be copied to userspace, causing an information leak.
https://lore.kernel.org/kvm/20230214103304.3689213-1-gregkh%40linuxfoundation.org/
https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html
https://github.com/torvalds/linux/commit/2c10b61421a28e95a46ab489fd56c0f442ff6952