CVE-2025-40174

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-11-12. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 5 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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 ]

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

November 12, 2025

Last Modified

August 5, 2026

Advisory Details (2)

Auto-updated Jul 30, 2026
No patch confirmed yet.
generic

x86/mm: Fix SMP ordering in switch_mm_irqs_off() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/83b0177a6c4889b3a6e865da5e21b2c9d97d0551
generic

x86/mm: Fix SMP ordering in switch_mm_irqs_off() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0fe5e3f5fb75c5d88dad24dece3ee75e9d87adeb

Vendor Advisories for CVE-2025-40174(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-gcp-64k-6.17 (6.17.0-1007.7) @ questing2026-07-30ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-14.14) @ questing2026-07-30ubuntu
ubuntulinux-tools-oracle-64k-6.17 (6.17.0-1007.7) @ questing2026-07-30ubuntu
ubuntulinux-tools-oem-6.17 (6.17.0-1011.11) @ noble2026-07-30ubuntu
ubuntulinux-tools-azure-6.17 (6.17.0-1008.8) @ questing2026-07-30ubuntu
linuxKernel @ 6.17.5—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 14× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 141 total refreshes for this CVE.

  1. 2026-08-05 12:52 UTCEG score recompute
  2. 2026-08-05 12:52 UTCVendor advisory
  3. 2026-08-05 12:52 UTCGHSA enrichment
  4. 2026-08-04 15:09 UTCEPSS rescore
  5. 2026-08-04 10:37 UTCEPSS rescore
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  9. 2026-07-30 16:27 UTCEPSS rescore
  10. 2026-07-30 06:27 UTCEG score recompute▲ 7.80
  11. 2026-07-30 06:27 UTCVendor advisory
  12. 2026-07-30 06:27 UTCGHSA enrichment
  13. 2026-07-30 06:18 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  14. 2026-07-30 01:29 UTCEPSS rescore
  15. 2026-07-28 15:35 UTCEPSS rescore
  16. 2026-07-27 07:39 UTCOSV refresh
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  21. 2026-07-23 02:55 UTCEG score recompute
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  18. 2026-07-10 01:47 UTCOSV refresh
  19. 2026-07-09 19:09 UTCEPSS rescore
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  48. 2026-06-21 12:31 UTCOSV refresh
  49. 2026-06-21 01:59 UTCEPSS rescore
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Related CVEs(same product + same vendor)

Frequently asked(5)

What is CVE-2025-40174?
CVE-2025-40174 is a high vulnerability published on November 12, 2025. In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix SMP ordering in switchmmirqs_off() Stephen noted that it is possible to not have an smp_mb() between the loadedmm store and the tlbgen load in switch_mm(), meaning the ordering against flushtlbmm_range() goes out the…
When was CVE-2025-40174 disclosed?
CVE-2025-40174 was first published in the National Vulnerability Database on November 12, 2025, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-40174 actively exploited?
CVE-2025-40174 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.0% of all scored CVEs.
What is the CVSS score of CVE-2025-40174?
CVE-2025-40174 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2025-40174?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-40174, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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