CVE-2016-7421 Denial of service in n/a

What is CVE-2016-7421?

CVE-2016-7421 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 10 Dec 2016. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The pvscsi_ring_pop_req_descr function in hw/scsi/vmw_pvscsi.c in QEMU (aka Quick Emulator) allows local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by leveraging failure to limit process IO loop to the ring size.

Weakness: CWE-834

Which versions are affected by CVE-2016-7421?

It affects 2 products.

Products include Debian Debian Linux, Qemu Qemu.

How do I fix CVE-2016-7421?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2016-7421 being exploited?

There is no known exploitation of CVE-2016-7421 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

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• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2016-7421, GHSA-764p-pqfm-x2x7, UBUNTU-CVE-2016-7421.