Description
The Network Block Device (NBD) server in Quick Emulator (QEMU) before 2.11 is vulnerable to a denial of service issue. It could occur if a client sent large option requests, making the server waste CPU time on reading up to 4GB per request. A client could use this flaw to keep the NBD server from serving other requests, resulting in DoS.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| QEMU | qemu | 2.11 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | qemu | 1:2.11+dfsg-1 | — |
| Debian 13 | qemu | 1:2.11+dfsg-1 | — |
| Debian 12 | qemu | 1:2.11+dfsg-1 | — |
| Debian 9 | qemu | 1:2.8+dfsg-6+deb9u4 | DSA-4213-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | qemu | 1:2.5+dfsg-5ubuntu10.22 | USN-3575-1 |
| Ubuntu 14.04 LTS | qemu | 2.0.0+dfsg-2ubuntu1.39 | USN-3575-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | qemu-img-rhev +3 | 10:2.10.0-21.el7 | RHSA-2018:1104 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat OpenStack 12 | qemu-img-rhev +3 | 10:2.10.0-21.el7 | RHSA-2018:1113 |
| Red Hat OpenStack 11 | qemu-img-rhev +3 | 10:2.10.0-21.el7 | RHSA-2018:1113 |
| Red Hat OpenStack 10 | qemu-img-rhev +3 | 10:2.10.0-21.el7 | RHSA-2018:1113 |
| Red Hat OpenStack 9 | qemu-img-rhev +3 | 10:2.10.0-21.el7 | RHSA-2018:1113 |
| Red Hat OpenStack 8 | qemu-img-rhev +3 | 10:2.10.0-21.el7 | RHSA-2018:1113 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | qemu | 2.9.1-6.12.1 | SUSE-SU-2018:0762-1 |
| SLES 12 SP2 | qemu | 2.6.2-41.37.1 | SUSE-SU-2018:0831-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | qemu | 2.9.1-6.12.1 | SUSE-SU-2018:0762-1 |
| SLES for SAP 12 SP2 | qemu | 2.6.2-41.37.1 | SUSE-SU-2018:0831-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | qemu +12 | 15:3.0.0-1.el7 | ELSA-2019-4585, ELSA-2018-4289, ELSA-2018-4285 |
Advisories 9
- RHSA-2018:1113 Red Hat Security Advisory: qemu-kvm-rhev security and bug fix update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2018:1104 Red Hat Security Advisory: qemu-kvm-rhev security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- DSA-4213-1 qemu - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3575-1 qemu vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2018:0831-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0762-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2019-4585 Important: qemu security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 15, 2019
- ELSA-2018-4289 Important: qemu security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 28, 2018
- ELSA-2018-4285 Important: qemu security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 20, 2018
References
- https://lists.gnu.org/archive/html/qemu-devel/2017-11/msg05044.html
- http://www.openwall.com/lists/oss-security/2017/11/28/9
- 102011 vdb-entry
- DSA-4213 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-15119
- RHSA-2018:1104 vendor-advisory
- RHSA-2018:1113 vendor-advisory
- USN-3575-1 vendor-advisory