Description
The qemu-nbd server in QEMU (aka Quick Emulator), when built with the Network Block Device (NBD) Server support, allows remote attackers to cause a denial of service (segmentation fault and server crash) by leveraging failure to ensure that all initialization occurs before talking to a client in the nbd_negotiate function.
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 | 1:2.8+dfsg-7 | — |
| Debian 13 | qemu | 1:2.8+dfsg-7 | — |
| Debian 12 | qemu | 1:2.8+dfsg-7 | — |
| Debian 9 | qemu | 1:2.8+dfsg-6+deb9u2 | DSA-3925-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | qemu-img +3 | 10:1.5.3-126.el7_3.10 | RHSA-2017:1681 |
| RHEL 7 | qemu-img-rhev +3 | 10:2.6.0-28.el7_3.12 | RHSA-2017:1682 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat OpenStack 11 | qemu-img-rhev +3 | 10:2.9.0-10.el7 | RHSA-2017:2408 |
| Red Hat OpenStack 10 | qemu-img-rhev +3 | 10:2.9.0-10.el7 | RHSA-2017:2408 |
| Red Hat OpenStack 9 | qemu-img-rhev +3 | 10:2.9.0-10.el7 | RHSA-2017:2408 |
| Red Hat OpenStack 8 | qemu-img-rhev +3 | 10:2.9.0-10.el7 | RHSA-2017:2408 |
| Red Hat OpenStack 7 | qemu-img-rhev +3 | 10:2.9.0-10.el7 | RHSA-2017:2408 |
| Red Hat OpenStack 6 | qemu-img-rhev +3 | 10:2.9.0-10.el7 | RHSA-2017:2408 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | qemu | 2.6.2-41.22.2 | SUSE-SU-2017:2936-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | qemu | 2.6.2-41.22.2 | SUSE-SU-2017:2936-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | qemu | 6.1.0-32.1 | openSUSE-SU-2024:11287-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | qemu +10 | 15:3.1.0-5.el7 | ELSA-2019-4713 |
| Oracle Linux 7 | qemu-img +3 | 10:1.5.3-126.el7_3.10 | ELSA-2019-4713, ELSA-2017-1681 |
Advisories 9
- RHSA-2017:2408 Red Hat Security Advisory: qemu-kvm-rhev security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2017:1682 Red Hat Security Advisory: qemu-kvm-rhev security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2017:1681 Red Hat Security Advisory: qemu-kvm security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- DSA-3925-1 qemu - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:11287-1 qemu-6.1.0-32.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2017:2936-1 Security update for qemu SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2024-2022 QEMU: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Sep 2, 2024
- ELSA-2019-4713 Important: qemu security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 10, 2019
- ELSA-2017-1681 Important: qemu-kvm security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 5, 2017
References
- RHSA-2017:1681 vendor-advisory
- [oss-security] 20170612 CVE-2017-9524 Qemu: nbd: segmentation fault due to client non-negotiation mailing-list
- RHSA-2017:1682 vendor-advisory
- 99011 vdb-entry
- [qemu-devel] 20170526 [PATCH] nbd: Fully initialize client in case of failed negotiation mailing-list
- RHSA-2017:2408 vendor-advisory
- DSA-3925 vendor-advisory
- [qemu-devel] 20170608 [PATCH] nbd: Fix regression on resiliency to port scan mailing-list