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An issue was discovered in include/asm-generic/tlb.h in the Linux kernel before 5.19. Because of a race condition (unmap_mapping_range versus munmap), a device driver can free a page while it still has stale TLB entries. This only occurs in situations with VM_PFNMAP VMAs. Refrence: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b67fbebd4cf980aecbcc750e1462128bffe8ae15 https://bugs.chromium.org/p/project-zero/issues/detail?id=2329
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 2130158]
This was fixed for Fedora with the 5.19 kernel rebases.