CVE-2025-40174 – x86/mm: Fix SMP ordering in switch_mm_irqs_off()

CVE ID : CVE-2025-40174

Published : Nov. 12, 2025, 11:15 a.m. | 16 minutes ago

Description : 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.

Severity: 0.0 | NA

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