# CVE-2026-6426 — Red Hat Enterprise Linux 10

> As of 2026-08-10, CVE-2026-6426 is a MEDIUM-severity vulnerability in Red Hat Enterprise Linux 10, CVSS v3.1 4.4. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-6426 as of 2026-08-10; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-10

## What is CVE-2026-6426?

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.

The record classifies CVE-2026-6426 under weakness class [CWE-681](https://cwe.mitre.org/data/definitions/681.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs high-privilege credentials, needs no user interaction, and has high impact on availability. 7 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 56 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 4.4 — MEDIUM (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-10

## Is CVE-2026-6426 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Red Hat](https://intel.threadlinqs.com/vendors/red-hat): Enterprise Linux 10, Enterprise Linux 6, Enterprise Linux 7, Enterprise Linux 8, Enterprise Linux 9, Enterprise Linux for NVIDIA 26, OpenShift Container Platform 4

## How to fix CVE-2026-6426

No vendor patch reference has been recorded for CVE-2026-6426 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-6426

No threat campaign in the Threadlinqs corpus currently references CVE-2026-6426, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org. Last verified by Threadlinqs on 2026-08-12.

**Third-party advisory**

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

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-6426
Full detection coverage and IOCs for threats exploiting CVE-2026-6426 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp