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Fencer Vulns
critical 9.8

CVE-2018-17963 json

qemu_deliver_packet_iov in net/net.c in Qemu accepts packet sizes greater than INT_MAX, which allows attackers to cause a denial of service…

published 2018-10-09 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-9703

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.7%
EPSS 4.7% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

qemu_deliver_packet_iov in net/net.c in Qemu accepts packet sizes greater than INT_MAX, which allows attackers to cause a denial of service or possibly have unspecified other impact.

Patch / fix

  • qemu Debian 14, Debian 13, Debian 12 1:3.1+dfsg-1

debian advisories DEBIAN-CVE-2018-17963

  • qemu Ubuntu 14.04 LTS 2.0.0+dfsg-2ubuntu1.44
  • qemu Ubuntu 16.04 LTS 1:2.5+dfsg-5ubuntu10.33
  • qemu Ubuntu 18.04 LTS 1:2.11+dfsg-1ubuntu7.8

ubuntu advisories UBUNTU-CVE-2018-17963

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • qemu-kvm-rhev rhev manager 4.3, RHEL 7, openstack 14 +2 more 10:2.12.0-33.el7
  • qemu-img-rhev rhev manager 4.3, RHEL 7, openstack 14 +2 more 10:2.12.0-33.el7
  • qemu-kvm-tools-rhev rhev manager 4.3, RHEL 7, openstack 14 +2 more 10:2.12.0-33.el7
  • qemu-kvm-common-rhev rhev manager 4.3, RHEL 7, openstack 14 +2 more 10:2.12.0-33.el7
  • qemu-kvm-ma RHEL 7 10:2.12.0-33.el7
  • qemu-img-ma RHEL 7 10:2.12.0-33.el7
  • qemu-kvm-tools-ma RHEL 7 10:2.12.0-33.el7
  • qemu-kvm-common-ma RHEL 7 10:2.12.0-33.el7

red hat advisories RHSA-2019:2425RHSA-2019:2166RHSA-2019:2553

  • xen SLE Point of Sale 11 SP3 4.2.5_21-45.30.1
  • xen SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 4.4.4_38-61.40.1
  • xen SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 +1 more 4.11.1_02-2.3.1
  • qemu SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +2 more 2.6.2-41.46.2
  • qemu SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 2.11.2-5.5.1
  • qemu SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 2.9.1-6.22.3
  • kvm SLES 11 SP3-TERADATA, SLES 11 SP3-LTSS, SLE Point of Sale 11 SP3 1.4.2-53.26.2
  • kvm SLES for SAP 11 SP4, SLES 11 SP4 1.4.2-60.18.2

suse advisories SUSE-SU-2018:3973-2SUSE-SU-2019:14011-1SUSE-SU-2019:0827-1SUSE-SU-2019:0825-1SUSE-SU-2019:13921-1SUSE-SU-2019:0003-1

  • qemu openSUSE Tumbleweed 6.1.0-32.1

opensuse advisories openSUSE-SU-2024:11287-1

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-2018-17963 updated cvss 6.5

QEMU: net: ignore packets with large size

  • 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 8 (Liberty) qemu-img-rhev, qemu-kvm-rhev, libcacard-rhev, qemu-kvm-tools-rhev, libcacard-devel-rhev, libcacard-tools-rhev, +1 more Red Hat OpenStack Platform 9 (Mitaka) qemu-img-rhev, qemu-kvm-rhev, libcacard-rhev, qemu-kvm-tools-rhev, libcacard-devel-rhev, libcacard-tools-rhev, +1 more
    affected: no fix planned “Will not fix”
  • Red Hat OpenStack Platform 12 (Pike) qemu-img-rhev, qemu-kvm-rhev, qemu-kvm-tools-rhev, qemu-kvm-common-rhev
    affected: no fix available
  • Red Hat Enterprise Linux Server (v. 7) qemu-img-ma 2.12.0-33.el7, qemu-kvm-ma 2.12.0-33.el7, qemu-kvm-tools-ma 2.12.0-33.el7, qemu-kvm-common-ma 2.12.0-33.el7 Red Hat Enterprise Linux Server Optional (v. 7) qemu-kvm-ma 2.12.0-33.el7, qemu-kvm-tools-ma 2.12.0-33.el7, qemu-kvm-common-ma 2.12.0-33.el7
    fixed: vendor fix RHSA-2019:2166
  • Red Hat OpenStack Platform 10.0 qemu-img-rhev 2.12.0-33.el7, qemu-kvm-rhev 2.12.0-33.el7, qemu-kvm-tools-rhev 2.12.0-33.el7, qemu-kvm-common-rhev 2.12.0-33.el7 Red Hat OpenStack Platform 13.0 qemu-img-rhev 2.12.0-33.el7, qemu-kvm-rhev 2.12.0-33.el7, qemu-kvm-tools-rhev 2.12.0-33.el7, qemu-kvm-common-rhev 2.12.0-33.el7 Red Hat OpenStack Platform 14.0 qemu-img-rhev 2.12.0-33.el7, qemu-kvm-rhev 2.12.0-33.el7, qemu-kvm-tools-rhev 2.12.0-33.el7, qemu-kvm-common-rhev 2.12.0-33.el7
    fixed: vendor fix RHSA-2019:2425
  • Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts qemu-img-rhev 2.12.0-33.el7, qemu-kvm-rhev 2.12.0-33.el7, qemu-kvm-tools-rhev 2.12.0-33.el7, qemu-kvm-common-rhev 2.12.0-33.el7 Red Hat RHV-M 4.3 qemu-img-rhev 2.12.0-33.el7, qemu-kvm-rhev 2.12.0-33.el7, qemu-kvm-tools-rhev 2.12.0-33.el7, qemu-kvm-common-rhev 2.12.0-33.el7
    fixed: vendor fix RHSA-2019:2553
  • Red Hat Enterprise Linux 5 kvm Red Hat Enterprise Linux 8 qemu-img, qemu-kvm, qemu-kvm-core, qemu-kvm-tests, qemu-kvm-common, qemu-guest-agent, +8 more
    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

4.65% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.