CVE-2026-102916— Reachable assertion in illumos bhyve REP string instruction emulation allows guest to panic host
Quick assessment
Affected
illumos illumos-gate
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 illumos 的 bhyve 指令模拟器中存在一个可达的断言错误，可能导致虚拟机（guest）使宿主机（host）崩溃。当模拟带有 REP 前缀的 MOVS 或 STOS 指令且这些指令访问客户机内存映射 I/O（MMIO）时，函数 vie_emulate_movs() 和 vie_emulate_stos()（位于 usr/src/uts/intel/io/vmm/vmm_instruction_emul.c 文件中）在最后一次迭代时未能清除 VIES_REPEAT 状态标志。对于在内核中模拟的 MMIO
Possible ATT&CK Techniques 2 AI
T1499.002 · Service Exhaustion Flood T1499.004 · Application or System ExploitationAffected Version Matrix 5
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| illumos | illumos-gate | e0c0d44e917080841514d0dd031a696c74e8c435< 696ecf8debceed9dc33937d8c8e111e4aeebfdae |
affected |
| OmniOS | OmniOS | any< r151054 |
affected |
r151058< r151058w |
affected | ||
r151056< r151056aw |
affected | ||
r151054< r151054bw |
affected |
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I. Basic Information for CVE-2026-102916
Vulnerability Information
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Vulnerability Title
Reachable assertion in illumos bhyve REP string instruction emulation allows guest to panic host
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| illumos | illumos-gate | e0c0d44e917080841514d0dd031a696c74e8c435 ~ 696ecf8debceed9dc33937d8c8e111e4aeebfdae | - |
|
| OmniOS | OmniOS | any ~ r151054 | - |
|
II. Public POCs for CVE-2026-102916
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-102916 (1)
Vendor Advisories for CVE-2026-102916 (1)
Mailing List Discussions for CVE-2026-102916 (1)
Same Patch Batch · illumos · 2026-10-09 · 6 CVEs total
| CVE-2026-104112 | 6.8 MEDIUM | Missing release of passed file descriptors in illumos nscd allows local users to exhaust k |
| CVE-2026-104114 | 5.4 MEDIUM | NULL pointer dereference in illumos nwamd door handler allows local users to crash the dae |
| CVE-2026-104115 | 5.4 MEDIUM | Stack buffer overflow in illumos reparsed nfs-basic plugin allows local users to crash the |
| CVE-2026-104117 | 1.9 LOW | Missing authorization in illumos ipmgmtd allows local users to change persistent IPMP grou |
| CVE-2026-104116 | 1.9 LOW | Missing authorization in illumos zonestatd allows local users to disrupt zonestat and enum |
IV. Related Vulnerabilities
Same product: illumos-gate
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CVE-2026-104115
Stack buffer overflow in illumos reparsed nfs-basic plugin a -
CVE-2026-104114
NULL pointer dereference in illumos nwamd door handler allow -
CVE-2026-104112
Missing release of passed file descriptors in illumos nscd a -
CVE-2026-104116
Missing authorization in illumos zonestatd allows local user -
CVE-2026-104117
Missing authorization in illumos ipmgmtd allows local users
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CVE-2026-104116
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CVE-2026-104117
Missing authorization in illumos ipmgmtd allows local users
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V. Comments for CVE-2026-102916
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