CVE-2026-23402

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-04-01. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: 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: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE

Adjust KVM's sanity check against overwriting a shadow-present SPTE with a another SPTE with a different target PFN to only apply to direct MMUs, i.e. only to MMUs without shadowed gPTEs. While it's impossible for KVM to overwrite a shadow-present SPTE in response to a guest write, writes from outside the scope of KVM, e.g. from host userspace, aren't detected by KVM's write tracking and so can break KVM's shadow paging rules.

------------[ cut here ]------------ pfn != spte_to_pfn(*sptep) WARNING: arch/x86/kvm/mmu/mmu.c:3069 at mmu_set_spte+0x1e4/0x440 [kvm], CPU#0: vmx_ept_stale_r/872 Modules linked in: kvm_intel kvm irqbypass CPU: 0 UID: 1000 PID: 872 Comm: vmx_ept_stale_r Not tainted 7.0.0-rc2-eafebd2d2ab0-sink-vm #319 PREEMPT Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:mmu_set_spte+0x1e4/0x440 [kvm] Call Trace: ept_page_fault+0x535/0x7f0 [kvm] kvm_mmu_do_page_fault+0xee/0x1f0 [kvm] kvm_mmu_page_fault+0x8d/0x620 [kvm] vmx_handle_exit+0x18c/0x5a0 [kvm_intel] kvm_arch_vcpu_ioctl_run+0xc55/0x1c20 [kvm] kvm_vcpu_ioctl+0x2d5/0x980 [kvm] __x64_sys_ioctl+0x8a/0xd0 do_syscall_64+0xb5/0x730 entry_SYSCALL_64_after_hwframe+0x4b/0x53 ---[ end trace 0000000000000000 ]---

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

April 1, 2026

Last Modified

April 24, 2026

Advisory Details (3)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/df83746075778958954aa0460cca55f4b3fc9c02
generic

KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bab090e8fd5607f77379ea78b9d0c683cb1538a9
generic

KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a1e0f7150639bc30a8e75476d1c7daab77d44992

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.18.21—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.

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (124 versions)6.19.11-1—

Data Freshness Timeline

(refreshed 5× in last 7d / 26× 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 182 total refreshes for this CVE.

  1. 2026-09-13 16:47 UTCEPSS rescore
  2. 2026-09-12 15:01 UTCEPSS rescore
  3. 2026-09-11 14:52 UTCEPSS rescore
  4. 2026-09-10 09:34 UTCEPSS rescore
  5. 2026-09-08 22:00 UTCEPSS rescore
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  9. 2026-09-04 05:06 UTCEPSS rescore
  10. 2026-09-02 11:44 UTCOSV refresh
  11. 2026-09-01 13:53 UTCEPSS rescore
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  13. 2026-08-30 19:17 UTCEPSS rescore
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  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 09:32 UTCEG score recompute
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  1. 2026-08-16 09:32 UTCGHSA enrichment
  2. 2026-08-16 02:14 UTCEPSS rescore
  3. 2026-08-15 01:30 UTCEPSS rescore
  4. 2026-08-14 05:57 UTCGHSA enrichment
  5. 2026-08-12 20:14 UTCEG score recompute
  6. 2026-08-12 20:14 UTCGHSA enrichment
  7. 2026-08-12 13:50 UTCEPSS rescore
  8. 2026-08-11 13:42 UTCEPSS rescore
  9. 2026-08-11 08:01 UTCEG score recompute
  10. 2026-08-11 08:01 UTCGHSA enrichment
  11. 2026-08-11 00:00 UTCEPSS rescore
  12. 2026-08-10 06:46 UTCEG score recompute
  13. 2026-08-10 06:46 UTCGHSA enrichment
  14. 2026-08-09 13:46 UTCEPSS rescore
  15. 2026-08-09 05:31 UTCEG score recompute
  16. 2026-08-09 05:31 UTCGHSA enrichment
  17. 2026-08-08 16:37 UTCEPSS rescore
  18. 2026-08-07 15:37 UTCEG score recompute
  19. 2026-08-07 15:37 UTCGHSA enrichment
  20. 2026-08-06 13:46 UTCEPSS rescore
  21. 2026-08-06 00:31 UTCEG score recompute
  22. 2026-08-06 00:31 UTCGHSA enrichment
  23. 2026-08-05 19:17 UTCEPSS rescore
  24. 2026-08-04 15:10 UTCEPSS rescore
  25. 2026-08-04 10:38 UTCEPSS rescore
  26. 2026-08-03 22:51 UTCEG score recompute
  27. 2026-08-03 22:51 UTCGHSA enrichment
  28. 2026-08-03 10:35 UTCEPSS rescore
  29. 2026-08-02 14:51 UTCEG score recompute
  30. 2026-08-02 14:51 UTCGHSA enrichment
  31. 2026-08-02 02:26 UTCEPSS rescore
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  37. 2026-07-25 14:17 UTCEPSS rescore
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  40. 2026-07-23 14:18 UTCEPSS rescore
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  42. 2026-07-23 03:07 UTCEG score recompute
  43. 2026-07-22 14:08 UTCEPSS rescore
  44. 2026-07-21 15:24 UTCEPSS rescore
  45. 2026-07-21 15:24 UTCEPSS rescore
  46. 2026-07-20 17:08 UTCEPSS rescore
  47. 2026-07-19 14:31 UTCEPSS rescore
  48. 2026-07-19 14:31 UTCEPSS rescore
  49. 2026-07-19 02:29 UTCEPSS rescore
  50. 2026-07-19 02:28 UTCEPSS rescore
  51. 2026-07-18 10:04 UTCEPSS rescore
  52. 2026-07-18 10:04 UTCEPSS rescore
  53. 2026-07-17 04:24 UTCOSV refresh
  54. 2026-07-16 17:03 UTCEPSS rescore
  55. 2026-07-16 17:03 UTCEPSS rescore
  56. 2026-07-15 16:57 UTCEPSS rescore
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  62. 2026-07-12 05:46 UTCEPSS rescore
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  64. 2026-07-11 08:27 UTCEPSS rescore
  65. 2026-07-09 19:10 UTCEPSS rescore
  66. 2026-07-08 15:15 UTCEPSS rescore
  67. 2026-07-08 15:15 UTCEPSS rescore
  68. 2026-07-07 13:46 UTCEPSS rescore
  69. 2026-07-06 16:27 UTCEPSS rescore
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  71. 2026-07-05 02:30 UTCEPSS rescore
  72. 2026-07-04 06:31 UTCEPSS rescore
  73. 2026-07-04 06:31 UTCEPSS rescore
  74. 2026-07-01 15:06 UTCEPSS rescore
  75. 2026-07-01 15:06 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-23402?
CVE-2026-23402 is a medium vulnerability published on April 1, 2026. In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE Adjust KVM's sanity check against overwriting a shadow-present SPTE with a another SPTE with a different target PFN to only apply to direct MMUs, i.e. only…
When was CVE-2026-23402 disclosed?
CVE-2026-23402 was first published in the National Vulnerability Database on April 1, 2026, with the most recent update on April 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23402 actively exploited?
CVE-2026-23402 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 93.9% of all scored CVEs.
What is the CVSS score of CVE-2026-23402?
CVE-2026-23402 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-23402?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23402, 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.

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