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Bug 625850 (CVE-2017-7539) - <app-emulation/qemu-2.10.0: qemu-nbd crashes due to undefined I/O coroutine
Summary: <app-emulation/qemu-2.10.0: qemu-nbd crashes due to undefined I/O coroutine
Alias: CVE-2017-7539
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal minor (vote)
Assignee: Gentoo Security
Whiteboard: B3 [noglsa cve]
Depends on:
Reported: 2017-07-21 12:54 UTC by Christopher Díaz Riveros (RETIRED)
Modified: 2017-11-19 20:38 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description Christopher Díaz Riveros (RETIRED) gentoo-dev Security 2017-07-21 12:54:36 UTC
From URL:

Quick Emulator(Qemu) built with the Network Block Device(NBD) Server support
is vulnerable to a crash via assertion failure. It could occur if a client sent
undue data during initial connection negotiation.

A remote user/process could use this flaw to crash the qemu-nbd server
resulting in DoS.

Upstream patch:

Introduced by:

Comment 1 Matthias Maier gentoo-dev 2017-07-26 16:52:03 UTC
This CVE does not apply to any version currently in tree. Version 2.9.0 does not contain [1]

Comment 2 Matthias Maier gentoo-dev 2017-07-26 17:08:00 UTC
Please disregard my last comment.
Comment 3 Matthias Maier gentoo-dev 2017-07-26 18:57:50 UTC
commit 606c4d5b81243fb243bd38a21326e60c3318138c (HEAD -> master, origin/master, origin/HEAD)
Author: Matthias Maier <>
Date:   Wed Jul 26 13:53:25 2017 -0500

    app-emulation/qemu: security patches
     CVE-2017-7539,  bug #625850
     CVE-2017-10664, bug #623016
     CVE-2017-10806, bug #624088
    Package-Manager: Portage-2.3.6, Repoman-2.3.3
Comment 4 Matthias Maier gentoo-dev 2017-07-26 19:31:52 UTC
I am sorry, the last patch for this issue was not functional - I reverted the change.

At the moment it is not feasible to backport this upstream commit.
Comment 5 Matthias Maier gentoo-dev 2017-11-12 20:46:27 UTC
No vulnerable versions left in tree. Security please proceed.