Heap-based buffer overflow in the iscsi_aio_ioctl function in block/iscsi.c in QEMU…
Priority LOW 35CWE-787Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.00701 53rd percentileScored 2026-11-07
Fix Fixed Red Hat: 7 advisories
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 31
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* | up to 2.6.2 | Vulnerable | QEMU |
| cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:* | 12.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* | 14.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* | 16.04 | Vulnerable | Canonical |
| cpe:2.3:o:oracle:linux:7:-:*:*:*:*:*:* | 7 | Vulnerable | Oracle |
| cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Debian |
| cpe:2.3:a:redhat:openstack:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Red Hat |
| cpe:2.3:a:redhat:openstack:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:a:redhat:openstack:8:*:*:*:*:*:*:* | 8 | Vulnerable | Red Hat |
| cpe:2.3:a:redhat:openstack:9:*:*:*:*:*:*:* | 9 | Vulnerable | Red Hat |
- cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* Versions up to 2.6.2 Vulnerable ·QEMU
- cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:* Versions 12.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* Versions 14.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
- cpe:2.3:o:oracle:linux:7:-:*:*:*:*:*:* Versions 7 Vulnerable ·Oracle
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
- cpe:2.3:a:redhat:openstack:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
- cpe:2.3:a:redhat:openstack:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:a:redhat:openstack:8:*:*:*:*:*:*:* Versions 8 Vulnerable ·Red Hat
- cpe:2.3:a:redhat:openstack:9:*:*:*:*:*:*:* Versions 9 Vulnerable ·Red Hat
Show 21 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_eus:7.2:*:*:*:*:*:*:* | 7.2 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_eus:7.3:*:*:*:*:*:*:* | 7.3 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_eus:7.4:*:*:*:*:*:*:* | 7.4 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_eus:7.5:*:*:*:*:*:*:* | 7.5 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_eus:7.6:*:*:*:*:*:*:* | 7.6 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_eus:7.7:*:*:*:*:*:*:* | 7.7 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:* | 7.2 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:* | 7.3 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:* | 7.4 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* | 7.6 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:* | 7.7 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_tus:7.2:*:*:*:*:*:*:* | 7.2 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:*:*:*:*:*:*:* | 7.3 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* | 7.6 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:* | 7.7 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:a:redhat:openstack:5.0:*:*:*:*:*:*:* | 5.0 | Vulnerable | Red Hat |
| cpe:2.3:a:redhat:virtualization:3.0:*:*:*:*:*:*:* | 3.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* | 7.0 | Running on | Red Hat |
- cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_eus:7.2:*:*:*:*:*:*:* Versions 7.2 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_eus:7.3:*:*:*:*:*:*:* Versions 7.3 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_eus:7.4:*:*:*:*:*:*:* Versions 7.4 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_eus:7.5:*:*:*:*:*:*:* Versions 7.5 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_eus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_eus:7.7:*:*:*:*:*:*:* Versions 7.7 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:* Versions 7.2 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:* Versions 7.3 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:* Versions 7.4 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:* Versions 7.7 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.2:*:*:*:*:*:*:* Versions 7.2 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:*:*:*:*:*:*:* Versions 7.3 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:* Versions 7.7 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:a:redhat:openstack:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Red Hat
- cpe:2.3:a:redhat:virtualization:3.0:*:*:*:*:*:*:* Versions 3.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Running on ·Red Hat
Remediation
Red Hat 7 advisories
- RHSA-2016:1763 Released 2016-08-24 · Red Hat rating Moderateqemu-kvm-rhev security update
- Red Hat OpenStack Platform 9.0 libcacard-rhev-10:2.3.0-31.el7_2.21, libcacard-tools-rhev-10:2.3.0-31.el7_2.21, qemu-img-rhev-10:2.3.0-31.el7_2.21 +3
- RHSA-2016:1756 Released 2016-08-24 · Red Hat rating Moderateqemu-kvm-rhev security and bug fix update
- Red Hat OpenStack Platform 8.0 (Liberty) libcacard-rhev-10:2.3.0-31.el7_2.21, libcacard-tools-rhev-10:2.3.0-31.el7_2.21, qemu-img-rhev-10:2.3.0-31.el7_2.21 +3
- RHSA-2016:1653 Released 2016-08-23 · Red Hat rating Moderateqemu-kvm-rhev security update
- Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7 libcacard-rhev-10:2.3.0-31.el7_2.21, libcacard-tools-rhev-10:2.3.0-31.el7_2.21, qemu-img-rhev-10:2.3.0-31.el7_2.21 +3
Show 4 more Red Hat advisories
- RHSA-2016:1654 Released 2016-08-23 · Red Hat rating Moderateqemu-kvm-rhev security update
- Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7 libcacard-devel-rhev-10:2.3.0-31.el7_2.21, libcacard-rhev-10:2.3.0-31.el7_2.21, libcacard-tools-rhev-10:2.3.0-31.el7_2.21 +4
- RHSA-2016:1655 Released 2016-08-23 · Red Hat rating Moderateqemu-kvm-rhev security update
- Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) for RHEL 7 libcacard-devel-rhev-10:2.3.0-31.el7_2.21, libcacard-rhev-10:2.3.0-31.el7_2.21, libcacard-tools-rhev-10:2.3.0-31.el7_2.21 +4
- RHSA-2016:1607 Released 2016-08-12 · Red Hat rating Moderateqemu-kvm-rhev security update
- RHEV-H and VDSM for 7 Hosts libcacard-devel-rhev-10:2.3.0-31.el7_2.21, libcacard-rhev-10:2.3.0-31.el7_2.21, libcacard-tools-rhev-10:2.3.0-31.el7_2.21 +4
- RHSA-2016:1606 Released 2016-08-11 · Red Hat rating Moderateqemu-kvm security update
- Red Hat Enterprise Linux Client (v. 7) libcacard-10:1.5.3-105.el7_2.7, qemu-img-10:1.5.3-105.el7_2.7, qemu-kvm-10:1.5.3-105.el7_2.7 +2
- Red Hat Enterprise Linux Client Optional (v. 7) libcacard-devel-10:1.5.3-105.el7_2.7, libcacard-tools-10:1.5.3-105.el7_2.7
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) libcacard-10:1.5.3-105.el7_2.7, libcacard-devel-10:1.5.3-105.el7_2.7, libcacard-tools-10:1.5.3-105.el7_2.7 +4
- Red Hat Enterprise Linux Server (v. 7) libcacard-10:1.5.3-105.el7_2.7, qemu-img-10:1.5.3-105.el7_2.7, qemu-kvm-10:1.5.3-105.el7_2.7 +2
- Red Hat Enterprise Linux Server Optional (v. 7) libcacard-10:1.5.3-105.el7_2.7, libcacard-10:1.5.3-105.el7_2.7.ppc, libcacard-devel-10:1.5.3-105.el7_2.7 +2
- Red Hat Enterprise Linux Workstation (v. 7) libcacard-10:1.5.3-105.el7_2.7, qemu-img-10:1.5.3-105.el7_2.7, qemu-kvm-10:1.5.3-105.el7_2.7 +2
- Red Hat Enterprise Linux Workstation Optional (v. 7) libcacard-devel-10:1.5.3-105.el7_2.7, libcacard-tools-10:1.5.3-105.el7_2.7
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| RHEV-H and VDSM for 7 Hosts | Fixed | RHSA-2016:1607 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2016:1606 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2016:1606 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2016:1606 |
| Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) for RHEL 7 | Fixed | RHSA-2016:1655 |
| Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7 | Fixed | RHSA-2016:1654 |
| Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7 | Fixed | RHSA-2016:1653 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2016:1606 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2016:1606 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2016:1606 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2016:1606 |
| Red Hat OpenStack Platform 8.0 (Liberty) | Fixed | RHSA-2016:1756 |
| Red Hat OpenStack Platform 9.0 | Fixed | RHSA-2016:1763 |
Not affected: 3 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat OpenStack Platform 10 (Newton)
Timeline
- 2026-10-02 Threatist record created from CVE-2016-5126
- 2026-10-03 Alias added: GHSA-qgv9-9qpm-r86f
References
Patch 1
Advisory 15
- RHSA-2016:1756
- USN-3047-1
- RHSA-2016:1655
- [oss-security] 20160530 CVE Request Qemu: block: iscsi: buffer overflow in iscsi_aio_ioctl
- RHSA-2016:1763
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- RHSA-2016:1653
- RHSA-2016:1607
- RHSA-2016:1654
- GLSA-201609-01
- USN-3047-2
- RHSA-2016:1606
- [oss-security] 20160530 Re: CVE Request Qemu: block: iscsi: buffer overflow in iscsi_aio_ioctl
- https://bugzilla.redhat.com/show_bug.cgi?id=1340924
- [debian-lts-announce] 20190920 [SECURITY] [DLA 1927-1] qemu security update
Sources
- CVE-2016-5126 · CVE Program
- CVE-2016-5126 · NVD
- FIRST EPSS
- GHSA-qgv9-9qpm-r86f · GitHub Advisory Database · CC BY 4.0
- CVE-2016-5126 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences