{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e0c0d44e917080841514d0dd031a696c74e8c435"
            },
            {
              "fixed": "696ecf8debceed9dc33937d8c8e111e4aeebfdae"
            }
          ],
          "repo": "https://github.com/illumos/illumos-gate",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "illumos",
    "cwe_ids": [
      "CWE-617"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102916.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "r151058"
          },
          {
            "fixed": "r151058w"
          },
          {
            "introduced": "r151056"
          },
          {
            "fixed": "r151056aw"
          },
          {
            "introduced": "r151054"
          },
          {
            "fixed": "r151054bw"
          },
          {
            "introduced": "any"
          },
          {
            "fixed": "r151054"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "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.",
  "id": "CVE-2026-102916",
  "modified": "2026-10-10T10:30:34.975712341Z",
  "published": "2026-10-09T14:12:08.832Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/10/09/19"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102916.json"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/illumos/illumos-gate"
    },
    {
      "type": "FIX",
      "url": "https://github.com/illumos/illumos-gate/commit/696ecf8debceed9dc33937d8c8e111e4aeebfdae"
    },
    {
      "type": "WEB",
      "url": "https://illumos.org"
    },
    {
      "type": "REPORT",
      "url": "https://illumos.org/issues/18491"
    },
    {
      "type": "ARTICLE",
      "url": "https://illumos.topicbox.com/groups/developer/T697a32b688807e56/cve-2026-102916-18491-bhyve-rep-prefix-instr-emulation-fumbles-flags"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102916"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Reachable assertion in illumos bhyve REP string instruction emulation allows guest to panic host"
}