CVE-2026-6426 (GCVE-0-2026-6426)

Vulnerability from cvelistv5 – Published: 2026-08-10 21:22 – Updated: 2026-09-18 10:49
VLAI
Title
Qemu-kvm: vhost inflight migration vmstate integer type mismatch causes out-of-bounds access
Summary
A type mismatch vulnerability was found in QEMU's vhost inflight migration VMState handling. The destination buffer size is stored as a uint64_t but read by the VMS_VBUFFER load path as a signed int32_t. On little-endian hosts, a crafted incoming migration state with bit 31 set causes the value to be interpreted as negative and then implicitly converted to a very large size_t, leading qemu_get_buffer() to copy migration-stream data beyond the bounds of the mmap-backed inflight region. This can result in a crash of the QEMU process or memory corruption. Exploitation requires control of the migration producer or write access to the migration channel, combined with a destination configured to use vhost inflight migration.
Severity
4.4 (Medium)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-11 17:41 UTC
CWE
  • CWE-681 - Incorrect Conversion between Numeric Types
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1042 records in the last 180 days details
References
URL Tags
https://access.redhat.com/security/cve/CVE-2026-6426 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2513498 issue-trackingx_refsource_REDHAT
Impacted products
Date Public
2026-08-10 00:00
Credits
Red Hat would like to thank Seungjung Kim (Kyonggi University) for reporting this issue.
Show details on NVD website
To clipboard 

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                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/security/cve/CVE-2026-6426"
            },
            {
              "name": "RHBZ#2513498",
              "tags": [
                "issue-tracking",
                "x_refsource_REDHAT"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513498"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-08-10T00:00:00.000Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2026-08-10T00:00:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Qemu-kvm: vhost inflight migration vmstate integer type mismatch causes out-of-bounds access",
          "workarounds": [
            {
              "lang": "en",
              "value": "If vhost inflight migration is not required, it can be disabled by omitting the inflight parameter from the vhost-user device configuration. This prevents the vulnerable VMState deserialization path from being reached on the destination.\n\nEnvironments that require vhost inflight migration for live migration of vhost-user devices cannot use this mitigation and should prioritize applying the fix."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-681: Incorrect Conversion between Numeric Types"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2026-6426",
        "datePublished": "2026-08-10T21:22:29.414Z",
        "dateReserved": "2026-04-16T11:09:18.538Z",
        "dateUpdated": "2026-09-18T10:49:31.824Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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