CVE-2025-22045

Summary

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/20241230175550.4046587-13-riel@surriel.com/>) would probably be making the impact of this a lot worse.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux016c4d92cd16f569c6485ae62b076c1a4b779536 < 618d5612ecb7bfc1c85342daafeb2b47e29e77a3affected
LinuxLinux016c4d92cd16f569c6485ae62b076c1a4b779536 < 556d446068f90981e5d71ca686bdaccdd545d491affected
LinuxLinux016c4d92cd16f569c6485ae62b076c1a4b779536 < 0a8f806ea6b5dd64b3d1f05ff774817d5f7ddbd1affected
LinuxLinux016c4d92cd16f569c6485ae62b076c1a4b779536 < 0708fd6bd8161871bfbadced2ca4319b84ab44feaffected
LinuxLinux016c4d92cd16f569c6485ae62b076c1a4b779536 < 7085895c59e4057ffae17f58990ccb630087d0d2affected
LinuxLinux016c4d92cd16f569c6485ae62b076c1a4b779536 < 93224deb50a8d20df3884f3672ce9f982129aa50affected
LinuxLinux016c4d92cd16f569c6485ae62b076c1a4b779536 < 320ac1af4c0bdb92c864dc9250d1329234820edfaffected
LinuxLinux016c4d92cd16f569c6485ae62b076c1a4b779536 < 78d6f9a9eb2a5da6fcbd76d6191d24b0dcc321beaffected
LinuxLinux016c4d92cd16f569c6485ae62b076c1a4b779536 < 3ef938c3503563bfc2ac15083557f880d29c2e64affected
LinuxLinux4.20affected
LinuxLinux0 < 4.20unaffected
LinuxLinux5.4.292 <= 5.4.*unaffected
LinuxLinux5.10.236 <= 5.10.*unaffected
LinuxLinux5.15.180 <= 5.15.*unaffected
LinuxLinux6.1.134 <= 6.1.*unaffected
LinuxLinux6.6.87 <= 6.6.*unaffected
LinuxLinux6.12.23 <= 6.12.*unaffected
LinuxLinux6.13.11 <= 6.13.*unaffected
LinuxLinux6.14.2 <= 6.14.*unaffected
LinuxLinux6.15 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References