CVE-2026-102916 (GCVE-0-2026-102916)
Vulnerability from cvelistv5 – Published: 2026-10-09 14:12 – Updated: 2026-10-09 21:07
VLAI
EPSS
VEX
Title
Reachable assertion in illumos bhyve REP string instruction emulation allows guest to panic host
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 16:15 UTC
CWE
- CWE-617 - Reachable Assertion
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://illumos.topicbox.com/groups/developer/T69… | mailing-list |
| https://illumos.org/issues/18491 | issue-tracking |
| https://github.com/illumos/illumos-gate/commit/69… | patch |
| http://www.openwall.com/lists/oss-security/2026/1… |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| illumos | illumos-gate |
Affected:
e0c0d44e917080841514d0dd031a696c74e8c435 , < 696ecf8debceed9dc33937d8c8e111e4aeebfdae
(git)
|
|
| OmniOS | OmniOS |
Affected:
any , < r151054
(custom)
Affected: r151058 , < r151058w (custom) Affected: r151056 , < r151056aw (custom) Affected: r151054 , < r151054bw (custom) |
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"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-617",
"description": "CWE-617 Reachable Assertion",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-09T14:13:38.463Z",
"orgId": "0ca53633-f0b5-4853-ba72-e0a2e62000d0",
"shortName": "illumos"
},
"references": [
{
"tags": [
"mailing-list"
],
"url": "https://illumos.topicbox.com/groups/developer/T697a32b688807e56/cve-2026-102916-18491-bhyve-rep-prefix-instr-emulation-fumbles-flags"
},
{
"tags": [
"issue-tracking"
],
"url": "https://illumos.org/issues/18491"
},
{
"tags": [
"patch"
],
"url": "https://github.com/illumos/illumos-gate/commit/696ecf8debceed9dc33937d8c8e111e4aeebfdae"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Update your illumos distribution to one that includes the fix for this issue."
}
],
"value": "Update your illumos distribution to one that includes the fix for this issue."
}
],
"source": {
"discovery": "INTERNAL"
},
"title": "Reachable assertion in illumos bhyve REP string instruction emulation allows guest to panic host",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "No configuration-level mitigation is available. In-kernel emulation of the local APIC, I/O APIC and HPET cannot be disabled on affected systems. Update to an illumos distribution that includes the fix."
}
],
"value": "No configuration-level mitigation is available. In-kernel emulation of the local APIC, I/O APIC and HPET cannot be disabled on affected systems. Update to an illumos distribution that includes the fix."
}
],
"x_generator": {
"engine": "hand-authored"
}
}
},
"cveMetadata": {
"assignerOrgId": "0ca53633-f0b5-4853-ba72-e0a2e62000d0",
"assignerShortName": "illumos",
"cveId": "CVE-2026-102916",
"datePublished": "2026-10-09T14:12:08.832Z",
"dateReserved": "2026-09-29T18:57:32.373Z",
"dateUpdated": "2026-10-09T21:07:26.509Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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