arch/x86/kvm/mmu/paging_tmpl.h in the Linux kernel before 5.12.11 incorrectly computes the access permissions of a shadow page, leading to a missing guest protection page fault.Referenceshttps://github.com/torvalds/linux/commit/b1bd5cba3306691c771d558e94baa73e8b0b96b7https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.11https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlhttps://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
