CVE & CISA-KEV Catalog

CVE-2016-7421

MEDIUM
4.4
CVSS v3
NVD

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.

CWE-834

How to fix

Remediation Available
qemuDebian
Fixed in:1:2.7+dfsg-1CVE-2016-7421
Fixed in:1:2.7+dfsg-1CVE-2016-7421
Fixed in:1:2.7+dfsg-1CVE-2016-7421
Fixed in:1:2.7+dfsg-1CVE-2016-7421
qemuUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1
Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1
qemu-systemUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1
Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1
qemu-system-aarch64Ubuntu
Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1
Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1
qemu-system-armUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1
Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1
qemu-system-mipsUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1
Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1
qemu-system-miscUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1
Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1
qemu-system-ppcUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1
Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1
qemu-system-s390xUbuntu
Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1
qemu-system-sparcUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1
Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1
qemu-system-x86Ubuntu
Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1
Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityLow
Privileges RequiredHigh
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.40%probability of exploitation in 30 days
32ndpercentile

Low risk: more likely to be exploited than 32% of all known CVEs.

References

Other references1
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CVE-2016-7421 severity badge

Markdown

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.