CVE & CISA-KEV Catalog

CVE-2016-5126

HIGH

7.8

CVSS v3

Description

Heap-based buffer overflow in the iscsi_aio_ioctl function in block/iscsi.c in QEMU allows local guest OS users to cause a denial of service (QEMU process crash) or possibly execute arbitrary code via a crafted iSCSI asynchronous I/O ioctl call.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

qemuDebian

Fixed in:1:2.6+dfsg-2CVE-2016-5126

Fixed in:1:2.6+dfsg-2CVE-2016-5126

Fixed in:1:2.6+dfsg-2CVE-2016-5126

Fixed in:1:2.6+dfsg-2CVE-2016-5126

qemuUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.26USN-3047-1

Fixed in:1:2.5+dfsg-5ubuntu10.3USN-3047-1

qemu-systemUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.26USN-3047-1

Fixed in:1:2.5+dfsg-5ubuntu10.3USN-3047-1

qemu-system-aarch64Ubuntu

Fixed in:2.0.0+dfsg-2ubuntu1.26USN-3047-1

Fixed in:1:2.5+dfsg-5ubuntu10.3USN-3047-1

qemu-system-armUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.26USN-3047-1

Fixed in:1:2.5+dfsg-5ubuntu10.3USN-3047-1

qemu-system-mipsUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.26USN-3047-1

Fixed in:1:2.5+dfsg-5ubuntu10.3USN-3047-1

qemu-system-miscUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.26USN-3047-1

Fixed in:1:2.5+dfsg-5ubuntu10.3USN-3047-1

qemu-system-ppcUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.26USN-3047-1

Fixed in:1:2.5+dfsg-5ubuntu10.3USN-3047-1

qemu-system-s390xUbuntu

Fixed in:1:2.5+dfsg-5ubuntu10.3USN-3047-1

qemu-system-sparcUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.26USN-3047-1

Fixed in:1:2.5+dfsg-5ubuntu10.3USN-3047-1

qemu-system-x86Ubuntu

Fixed in:2.0.0+dfsg-2ubuntu1.26USN-3047-1

Fixed in:1:2.5+dfsg-5ubuntu10.3USN-3047-1

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.70%probability of exploitation in 30 days

49thpercentile

Moderate risk: more likely to be exploited than 49% of all known CVEs.

References

Patch1

lists.gnu.org

Third-Party Advisory16

Other references1

git.qemu.org

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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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.