CVE-2026-74515

HIGHPre-NVD 8.88.8
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-15. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

KVM: s390: pci: Reject adapter interrupt forwarding if already enabled

The MPCIFC instruction doesn't allow registering adapter interrupts without first unregistering. So reject any request to enable interrupt forwarding if its already enabled for the zPCI device. This also fixes overwriting and thus leaking resources when the ioctl is called multiple times for the same device.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 19, 2026

Advisory Details (5)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

KVM: s390: pci: Reject adapter interrupt forwarding if already enabled - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8fa01be5a6149404adb82c0979a78f6347edd3ef
generic

KVM: s390: pci: Reject adapter interrupt forwarding if already enabled - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/78d9648e7e960546d5b72504a0b0358cd8bb1e9d
generic

KVM: s390: pci: Reject adapter interrupt forwarding if already enabled - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6be1ff49ba81f96a6fa55915e6d920be43ac57cc
generic

KVM: s390: pci: Reject adapter interrupt forwarding if already enabled - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6837f0ae85fd54cf64c8a0c7c530bba2fae0a207
generic

KVM: s390: pci: Reject adapter interrupt forwarding if already enabled - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/591952b63a9f976da7d49f719f36ec826ee2a575

Vendor Advisories for CVE-2026-74515(1)

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

Data Freshness Timeline

(refreshed 30× in last 7d / 30× 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.

  1. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 19:37 UTCGHSA enrichment
  3. 2026-08-20 06:38 UTCGHSA enrichment
  4. 2026-08-19 17:38 UTCEG score recompute
  5. 2026-08-19 17:38 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 16:53 UTCEG score recompute
  8. 2026-08-19 16:53 UTCGHSA enrichment
  9. 2026-08-19 10:37 UTCGHSA enrichment
  10. 2026-08-18 21:37 UTCEG score recompute
  11. 2026-08-18 21:37 UTCGHSA enrichment
  12. 2026-08-18 13:49 UTCEPSS rescore
  13. 2026-08-18 13:49 UTCEPSS rescore
  14. 2026-08-18 08:25 UTCGHSA enrichment
  15. 2026-08-17 19:24 UTCEG score recompute
  16. 2026-08-17 19:24 UTCGHSA enrichment
  17. 2026-08-17 13:47 UTCEPSS rescore
  18. 2026-08-17 06:24 UTCEG score recompute
  19. 2026-08-17 06:24 UTCGHSA enrichment
  20. 2026-08-17 05:55 UTCEG score recompute 8.80
  21. 2026-08-17 05:55 UTCGHSA enrichment
  22. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  23. 2026-08-17 05:39 UTCEG score recompute
  24. 2026-08-17 05:39 UTCGHSA enrichment
  25. 2026-08-17 05:39 UTCMITRE cvelistV5
Show 5 more
  1. 2026-08-16 14:56 UTCEPSS rescore
  2. 2026-08-16 14:56 UTCEPSS rescore
  3. 2026-08-15 13:27 UTCNVD update
  4. 2026-08-15 12:39 UTCEG score recompute
  5. 2026-08-15 12:37 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74515?
CVE-2026-74515 is a high vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Reject adapter interrupt forwarding if already enabled The MPCIFC instruction doesn't allow registering adapter interrupts without first unregistering. So reject any request to enable interrupt forwarding if its…
When was CVE-2026-74515 disclosed?
CVE-2026-74515 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74515 actively exploited?
CVE-2026-74515 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-2026-74515?
CVE-2026-74515 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-74515?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74515, 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

Explore the affected products and dependency analysis for CVE-2026-74515

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