CVE-2025-40174
In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix SMP ordering in switch_mm_irqs_off() Stephen noted that it is possible to not have an smp_mb() between the loaded_mm store and the tlb_gen load in switch_mm(), meaning the ordering against flush_tlb_mm_range() goes out the window, and it becomes possible for switch_mm() to not observe a recent tlb_gen update and fail to flush the TLBs. [ dhansen: merge conflict fixed by Ingo ]
Affected versions
Linux kernel versions
6.14
and later are affected. Fixed in
6.17.5,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40174 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/0fe5e3f5fb75c5d88dad24dece3ee75e9d87adeb
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PatchKernel patch commithttps://git.kernel.org/stable/c/83b0177a6c4889b3a6e865da5e21b2c9d97d0551
Frequently asked questions
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What is CVE-2025-40174?
CVE-2025-40174 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.14 onward and has been patched in 6.17.5 and 6.18. CVE-2025-40174 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40174?
Yes — CVE-2025-40174 has been patched. Fixed versions include 6.17.5 and 6.18. If you are running Linux kernel 6.14 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40174 actively exploited?
No — CVE-2025-40174 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.