# CVE-2026-6426

## Summary

- **CVE ID:** CVE-2026-6426
- **Severity:** MEDIUM
- **CVSS Score:** 4.4 (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-681
- **Published:** Aug 10, 2026
- **Last Modified:** Aug 31, 2026

## Description

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.

## Affected Products

No affected products listed.

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-6426)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2513498)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.24%
- **EPSS Percentile:** 14.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._