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Fencer Vulns
medium 5.3

CVE-2017-7539 json

An assertion-failure flaw was found in Qemu before 2.10.1, in the Network Block Device (NBD) server's initial connection negotiation, where…

published 2018-07-26 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16552

cvss
5.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.5%
EPSS 5.5% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

An assertion-failure flaw was found in Qemu before 2.10.1, in the Network Block Device (NBD) server's initial connection negotiation, where the I/O coroutine was undefined. This could crash the qemu-nbd server if a client sent unexpected data during connection negotiation. A remote user or process could use this flaw to crash the qemu-nbd server resulting in denial of service.

Patch / fix

  • qemu qemu 2.10.1
  • qemu-kvm-rhev openstack 11, openstack 10, openstack 9 +3 more 10:2.9.0-16.el7_4.11
  • qemu-img-rhev openstack 11, openstack 10, openstack 9 +3 more 10:2.9.0-16.el7_4.11
  • qemu-kvm-tools-rhev openstack 11, openstack 10, openstack 9 +3 more 10:2.9.0-16.el7_4.11
  • qemu-kvm-common-rhev openstack 11, openstack 10, openstack 9 +3 more 10:2.9.0-16.el7_4.11
  • qemu-kvm-rhev RHEL 7 10:2.9.0-16.el7_4.5
  • qemu-img-rhev RHEL 7 10:2.9.0-16.el7_4.5
  • qemu-kvm-tools-rhev RHEL 7 10:2.9.0-16.el7_4.5
  • qemu-kvm-common-rhev RHEL 7 10:2.9.0-16.el7_4.5

red hat advisories RHSA-2017:3470RHSA-2017:3471RHSA-2017:3466RHSA-2017:3472RHSA-2017:3474RHSA-2017:3473

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-7539 updated cvss 5.3

Qemu: qemu-nbd crashes due to undefined I/O coroutine

  • Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7 qemu-img-rhev 2.9.0-16.el7_4.11, qemu-kvm-rhev 2.9.0-16.el7_4.11, qemu-kvm-tools-rhev 2.9.0-16.el7_4.11, qemu-kvm-common-rhev 2.9.0-16.el7_4.11
    fixed: vendor fix RHSA-2017:3473
  • Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7 qemu-img-rhev 2.9.0-16.el7_4.11, qemu-kvm-rhev 2.9.0-16.el7_4.11, qemu-kvm-tools-rhev 2.9.0-16.el7_4.11, qemu-kvm-common-rhev 2.9.0-16.el7_4.11
    fixed: vendor fix RHSA-2017:3472
  • Red Hat OpenStack Platform 8.0 (Liberty) qemu-img-rhev 2.9.0-16.el7_4.11, qemu-kvm-rhev 2.9.0-16.el7_4.11, qemu-kvm-tools-rhev 2.9.0-16.el7_4.11, qemu-kvm-common-rhev 2.9.0-16.el7_4.11
    fixed: vendor fix RHSA-2017:3471
  • Red Hat OpenStack Platform 9.0 qemu-img-rhev 2.9.0-16.el7_4.11, qemu-kvm-rhev 2.9.0-16.el7_4.11, qemu-kvm-tools-rhev 2.9.0-16.el7_4.11, qemu-kvm-common-rhev 2.9.0-16.el7_4.11
    fixed: vendor fix RHSA-2017:3470
  • Red Hat OpenStack Platform 10.0 qemu-img-rhev 2.9.0-16.el7_4.11, qemu-kvm-rhev 2.9.0-16.el7_4.11, qemu-kvm-tools-rhev 2.9.0-16.el7_4.11, qemu-kvm-common-rhev 2.9.0-16.el7_4.11
    fixed: vendor fix RHSA-2017:3474
  • Red Hat OpenStack Platform 11.0 qemu-img-rhev 2.9.0-16.el7_4.11, qemu-kvm-rhev 2.9.0-16.el7_4.11, qemu-kvm-tools-rhev 2.9.0-16.el7_4.11, qemu-kvm-common-rhev 2.9.0-16.el7_4.11
    fixed: vendor fix RHSA-2017:3466
  • Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts qemu-img-rhev 2.9.0-16.el7_4.5, qemu-kvm-rhev 2.9.0-16.el7_4.5, qemu-kvm-tools-rhev 2.9.0-16.el7_4.5, qemu-kvm-common-rhev 2.9.0-16.el7_4.5 Red Hat RHEV-H and VDSM for 7 Hosts qemu-img-rhev 2.9.0-16.el7_4.5, qemu-kvm-rhev 2.9.0-16.el7_4.5, qemu-kvm-tools-rhev 2.9.0-16.el7_4.5, qemu-kvm-common-rhev 2.9.0-16.el7_4.5
    fixed: vendor fix RHSA-2017:2628
  • Red Hat Enterprise Linux 5 kvm, xen Red Hat Enterprise Linux 6 qemu-img, qemu-kvm, qemu-kvm-tools, qemu-guest-agent, qemu-guest-agent-win32 Red Hat Enterprise Linux 7 qemu-img, qemu-kvm, libcacard, qemu-kvm-tools, libcacard-tools, qemu-kvm-common, +1 more Red Hat OpenStack Platform 12 (Pike) qemu-img-rhev, qemu-kvm-rhev, qemu-kvm-tools-rhev, qemu-kvm-common-rhev
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

5.46% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • QEMU Qemu

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.