Answer in brief
CVE-2025-40174 records a High severity (CVSS 7.8) vulnerability in x86/mm: Fix SMP ordering in switch_mm_irqs_off(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=209954cbc7d0ce1a190fc725d20ce303d74d2680 <0fe5e3f5fb75c5d88dad24dece3ee75e9d87adeb || >=209954cbc7d0ce1a190fc725d20ce303d74d2680 <83b0177a6c4889b3a6e865da5e21b2c9d97d0551 | 0fe5e3f5fb75c5d88dad24dece3ee75e9d87adeb, 83b0177a6c4889b3a6e865da5e21b2c9d97d0551 |
| Linux/Linuxgeneric | 6.14 | Not reported |
Published upstream
Nov 12, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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 ]
Quoted source text, attributed separately from HOL analysis.