CVE-2017-9524

Publication date 6 July 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
qemu	17.04 zesty	Fixed 1:2.8+dfsg-3ubuntu2.4
	16.10 yakkety	Ignored end of life
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected
qemu-kvm	17.04 zesty	Not in release
	16.10 yakkety	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
qemu	Upstream: https://git.qemu.org/gitweb.cgi?p=qemu.git;a=commit;h=df8ad9f128c15aa0a0ebc7b24e9a22c9775b67af Upstream: https://git.qemu.org/gitweb.cgi?p=qemu.git;a=commit;h=0c9390d978cbf61e8f16c9f580fa96b305c43568

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-3414-1
QEMU vulnerabilities
13 September 2017