CVE-2025-22045

In the Linux kernel, the following vulnerability has been resolved:

x86/mm: Fix flush_tlb_range() when used for zapping normal PMDs

On the following path, flush_tlb_range() can be used for zapping normal

PMD entries (PMD entries that point to page tables) together with the PTE

entries in the pointed-to page table:

collapse_pte_mapped_thp

pmdp_collapse_flush

flush_tlb_range

The arm64 version of flush_tlb_range() has a comment describing that it can

be used for page table removal, and does not use any last-level

invalidation optimizations. Fix the X86 version by making it behave the

same way.

Currently, X86 only uses this information for the following two purposes,

which I think means the issue doesn't have much impact:

- In native_flush_tlb_multi() for checking if lazy TLB CPUs need to be

IPI'd to avoid issues with speculative page table walks.

- In Hyper-V TLB paravirtualization, again for lazy TLB stuff.

The patch "x86/mm: only invalidate final translations with INVLPGB" which

is currently under review (see

<https://lore.kernel.org/all/[email protected]/>)

would probably be making the impact of this a lot worse.