CVE-2025-22045
Linux Kernel x86 PMD Flush Vulnerability
Description
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.
INFO
Published Date :
April 16, 2025, 3:15 p.m.
Last Modified :
April 17, 2025, 8:22 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
Public PoC/Exploit Available at Github
CVE-2025-22045 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 16, 2025
Action Type Old Value New Value Added Description 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. Added Reference https://git.kernel.org/stable/c/0708fd6bd8161871bfbadced2ca4319b84ab44fe Added Reference https://git.kernel.org/stable/c/0a8f806ea6b5dd64b3d1f05ff774817d5f7ddbd1 Added Reference https://git.kernel.org/stable/c/320ac1af4c0bdb92c864dc9250d1329234820edf Added Reference https://git.kernel.org/stable/c/3ef938c3503563bfc2ac15083557f880d29c2e64 Added Reference https://git.kernel.org/stable/c/556d446068f90981e5d71ca686bdaccdd545d491 Added Reference https://git.kernel.org/stable/c/618d5612ecb7bfc1c85342daafeb2b47e29e77a3 Added Reference https://git.kernel.org/stable/c/7085895c59e4057ffae17f58990ccb630087d0d2 Added Reference https://git.kernel.org/stable/c/78d6f9a9eb2a5da6fcbd76d6191d24b0dcc321be Added Reference https://git.kernel.org/stable/c/93224deb50a8d20df3884f3672ce9f982129aa50
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-22045 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-22045
weaknesses.