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CVE.org (no NVD analysis yet)· CNA illumos

CVE-2026-102916: Reachable assertion in illumos bhyve REP string instruction emulation allows guest to panic host

MediumCVSS 6.8 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 27/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: illumos illumos-gate 696ecf8debceed9dc33937d8c8e111e4aeebfdae; OmniOS OmniOS r151054bw, r151056aw, r151058w.

Low priority for now. Upgrade to illumos illumos-gate 696ecf8debceed9dc33937d8c8e111e4aeebfdae; OmniOS OmniOS r151054bw, r151056aw, r151058w or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Oct 9, 2026
Updated
Oct 9, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
27 / 40 · 6.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · illumos
6.8
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:P/AU:Y/R:A/V:C

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-102916

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (illumos). Independent of NVD's CPE analysis and usually ahead of it.

  • illumos illumos-gate

    • e0c0d44e917080841514d0dd031a696c74e8c435 and later · before 696ecf8debceed9dc33937d8c8e111e4aeebfdaeaffected · gitfixed in 696ecf8debceed9dc33937d8c8e111e4aeebfdae

  • OmniOS OmniOS

    • any and later · before r151054affected
    • r151058 and later · before r151058waffectedfixed in r151058w
    • r151056 and later · before r151056awaffectedfixed in r151056aw
    • r151054 and later · before r151054bwaffectedfixed in r151054bw

Same product

illumos: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-15422SCTP needs to better-check INIT ACK chunk parameters
    36Monitor
  • CVE-2023-31284illumos illumos-gate before 676abcb has a stack buffer overflow in /dev/net, leading to privilege escalation via a stat on a long file name…
    31Monitor
  • CVE-2026-104112Missing release of passed file descriptors in illumos nscd allows local users to exhaust kernel memory
    27Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-15449Jul 16, 2026 · TOCTOU double copyin in illumos dld ioctl handling causes kernel heap corruption
    23Monitor
  • Later →CVE-2026-104114Oct 9, 2026 · NULL pointer dereference in illumos nwamd door handler allows local users to crash the daemon
    21Monitor
  • Later →CVE-2026-104115Oct 9, 2026 · Stack buffer overflow in illumos reparsed nfs-basic plugin allows local users to crash the daemon
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
illumos illumos-gate696ecf8debceed9dc33937d8c8e111e4aeebfdaeVendor (CNA)
OmniOS OmniOSr151054bwVendor (CNA)
OmniOS OmniOSr151056awVendor (CNA)
OmniOS OmniOSr151058wVendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 13, 2026+35 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Not on record for this CVE: variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-617 · Reachable Assertion

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Exploit maturity— → none
  3. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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