CVE-2026-102916

MEDIUMPre-NVD 6.86.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 6.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (2nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-95796 (ENISA EUVD) · GHSA-rx9m-cwq2-hf3w (GitHub Security Advisories)Source: ENISA EUVD

6.8EG
EchelonGraph verdictMonitorThe upstream fix is not in a release yet: until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule, then apply it (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 6.8Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

A reachable assertion in the illumos bhyve instruction emulator allows a guest to panic the host. When emulating a REP-prefixed MOVS or STOS instruction that accesses guest MMIO, vie_emulate_movs() and vie_emulate_stos() in usr/src/uts/intel/io/vmm/vmm_instruction_emul.c do not clear the VIES_REPEAT status flag on the final iteration. For MMIO regions emulated in the kernel (the local APIC, I/O APIC and HPET), the stale flag causes a VERIFY assertion in vie_advance_pc() to fail, and the host panics. A privileged user within a guest VM can issue a REP MOVS or REP STOS instruction against the local APIC page to cause a denial of service of the host and every other guest running on it. The flaw has existed since 2020 (illumos-gate commit e0c0d44e), and affects any illumos distribution prior to illumos-gate commit 696ecf8d.

CVSS v3
6.8
EG Score
6.8MEDIUMmedium confidence
EG Risk
31
EG Risk 31/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity68% × 45%
Impact severity (EG Severity): CVSS 6.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule, then apply it.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.8): severity, escalated by confirmed exploitation. This CVE's 6.8 is its impact severity (EG Severity), not escalated.

EG Severity
6.8 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-28). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule, then apply it.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

October 9, 2026

Last Modified

October 9, 2026

Advisory Details (3)

Auto-updated Oct 9, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
GitHub commit

commit 696ecf8debce (illumos/illumos-gate)

Fix landed in illumos/illumos-gate commit 696ecf8debce — awaiting tagged release

https://github.com/illumos/illumos-gate/commit/696ecf8debceed9dc33937d8c8e111e4aeebfdae
Web page

Bug #18491: bhyve: rep prefix instr emulation fumbles flags - illumos gate - illumos

https://illumos.org/issues/18491

Vendor Advisories for CVE-2026-102916(1)

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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 47× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  2. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  3. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  4. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  5. 2026-10-29 14:49 UTCEG score recompute
  6. 2026-10-29 14:49 UTCGHSA enrichmentGHSA-rx9m-cwq2-hf3w
  7. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  8. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  9. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  10. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  11. 2026-10-25 14:56 UTCEG score recompute
  12. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  13. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  14. 2026-10-23 09:27 UTCEG score recompute
  15. 2026-10-23 09:27 UTCGHSA enrichmentGHSA-rx9m-cwq2-hf3w
  16. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  17. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  18. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  19. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  20. 2026-10-18 05:10 UTCEG score recompute
  21. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  22. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  23. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  25. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
Show 22 more
  1. 2026-10-12 16:40 UTCEG score recompute
  2. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-10-11 22:47 UTCGHSA enrichmentGHSA-rx9m-cwq2-hf3w
  4. 2026-10-11 20:15 UTCEG score recompute
  5. 2026-10-11 18:28 UTCEG score recompute
  6. 2026-10-11 15:01 UTCEG score recompute
  7. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  8. 2026-10-10 22:34 UTCEG score recompute
  9. 2026-10-10 22:34 UTCGHSA enrichmentGHSA-rx9m-cwq2-hf3w
  10. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  11. 2026-10-09 22:22 UTCEG score recompute
  12. 2026-10-09 22:22 UTCGHSA enrichmentGHSA-rx9m-cwq2-hf3w
  13. 2026-10-09 21:25 UTCEG score recompute
  14. 2026-10-09 21:25 UTCGHSA enrichmentGHSA-rx9m-cwq2-hf3w
  15. 2026-10-09 17:35 UTCEG score recompute
  16. 2026-10-09 17:35 UTCGHSA enrichmentGHSA-rx9m-cwq2-hf3w
  17. 2026-10-09 16:54 UTCEG score recompute
  18. 2026-10-09 16:54 UTCGHSA enrichmentGHSA-rx9m-cwq2-hf3w
  19. 2026-10-09 15:32 UTCEG score recompute
  20. 2026-10-09 15:32 UTCGHSA enrichmentGHSA-rx9m-cwq2-hf3w
  21. 2026-10-09 14:30 UTCEG score recomputeFirst assessed: 6.8 MEDIUM
  22. 2026-10-09 14:28 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-102916?
CVE-2026-102916 is a medium-severity vulnerability; its CVE record was published on October 9, 2026. A reachable assertion in the illumos bhyve instruction emulator allows a guest to panic the host. When emulating a REP-prefixed MOVS or STOS instruction that accesses guest MMIO, vie_emulate_movs() and vie_emulate_stos() in usr/src/uts/intel/io/vmm/vmm_instruction_emul.c do not clear the…
When was the CVE record for CVE-2026-102916 published?
The CVE record for CVE-2026-102916 was published on October 9, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 9, 2026; the record at its source may have been updated since.
Is CVE-2026-102916 actively exploited?
CVE-2026-102916 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102916?
CVE-2026-102916 has a CVSS base score of 6.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-102916?
An upstream fix for CVE-2026-102916 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-102916 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-102916

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