HOME VULNERABILITIESCVE-2016-5126

HIGH

CVE-2016-5126

CWE-787Published: June 1, 2016· Updated: Jun 17, 2026

7.8

CVSS v3.1

Official 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.

Technical Analysis

CVE-2016-5126 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges Req.Low

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

Affected Vendors & Products

Canonical1 product(s)

ubuntu linux

Debian1 product(s)

debian linux

Oracle1 product(s)

linux

qemu1 product(s)

qemu

Red Hat9 product(s)

openstackenterprise linux desktopenterprise linux eusenterprise linux serverenterprise linux server ausenterprise linux server tusenterprise linux workstationvirtualizationenterprise linux

Source: NVD CPE · 31 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://lists.gnu.org/archive/html/qemu-block/2016-05/msg00779.html

PATCHhttps://lists.gnu.org/archive/html/qemu-block/2016-05/msg00779.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1606.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1607.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1653.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1654.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1655.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1756.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1763.html

ADVISORYhttp://www.openwall.com/lists/oss-security/2016/05/30/6

ADVISORYhttp://www.openwall.com/lists/oss-security/2016/05/30/7

ADVISORYhttp://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html

ADVISORYhttp://www.securityfocus.com/bid/90948

ADVISORYhttp://www.ubuntu.com/usn/USN-3047-1

ADVISORYhttp://www.ubuntu.com/usn/USN-3047-2

ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1340924

ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/09/msg00021.html

ADVISORYhttps://security.gentoo.org/glsa/201609-01

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1606.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1607.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1653.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1654.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1655.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1756.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1763.html

ADVISORYhttp://www.openwall.com/lists/oss-security/2016/05/30/6

ADVISORYhttp://www.openwall.com/lists/oss-security/2016/05/30/7

ADVISORYhttp://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html

ADVISORYhttp://www.securityfocus.com/bid/90948

ADVISORYhttp://www.ubuntu.com/usn/USN-3047-1

ADVISORYhttp://www.ubuntu.com/usn/USN-3047-2

ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1340924

ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/09/msg00021.html

ADVISORYhttps://security.gentoo.org/glsa/201609-01

All References (36)

→

http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=a6b3167fa0e825aebb5a7cd8b437b6d41584a196

→

http://rhn.redhat.com/errata/RHSA-2016-1606.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2016-1607.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2016-1653.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2016-1654.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2016-1655.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2016-1756.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2016-1763.htmlThird Party Advisory

→

http://www.openwall.com/lists/oss-security/2016/05/30/6Mailing List · Third Party Advisory

→

http://www.openwall.com/lists/oss-security/2016/05/30/7Mailing List · Third Party Advisory

→

http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.htmlThird Party Advisory

→

http://www.securityfocus.com/bid/90948Third Party Advisory · VDB Entry

→

http://www.ubuntu.com/usn/USN-3047-1Third Party Advisory

→

http://www.ubuntu.com/usn/USN-3047-2Third Party Advisory

→

https://bugzilla.redhat.com/show_bug.cgi?id=1340924Issue Tracking · Third Party Advisory

Quick Facts

CVE IDCVE-2016-5126

CVSS Score7.8 / 10

SeverityHIGH

WeaknessCWE-787

CISA KEVNo

Affected5 vendor(s)

PublishedJun 1, 2016

Related CVEs (CWE-787)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2016-5126 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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