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Fencer Intel
high 7.8

CVE-2019-6778 json

In QEMU 3.0.0, tcp_emu in slirp/tcp_subr.c has a heap-based buffer overflow.

published 7y ago modified 4mo ago also EUVD-2019-16336

cvss
7.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

In QEMU 3.0.0, tcp_emu in slirp/tcp_subr.c has a heap-based buffer overflow.

Patch / fix

  • qemu Debian 14, Debian 13, Debian 12 1:3.1+dfsg-3
  • slirp4netns Debian 14, Debian 13, Debian 12 0.2.1-1

debian advisories DEBIAN-CVE-2019-6778

  • qemu Ubuntu 14.04 LTS 2.0.0+dfsg-2ubuntu1.45
  • qemu Ubuntu 16.04 LTS 1:2.5+dfsg-5ubuntu10.36
  • qemu Ubuntu 18.04 LTS 1:2.11+dfsg-1ubuntu7.12

ubuntu advisories UBUNTU-CVE-2019-6778

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 RHEL 6 2:0.12.1.2-2.506.el6_10.5
  • qemu-img RHEL 6 2:0.12.1.2-2.506.el6_10.5
  • qemu-kvm-tools RHEL 6 2:0.12.1.2-2.506.el6_10.5
  • qemu-guest-agent RHEL 6 2:0.12.1.2-2.506.el6_10.5
  • qemu-kvm-rhev openstack 14, openstack 13, openstack 10 10:2.12.0-33.el7
  • qemu-img-rhev openstack 14, openstack 13, openstack 10 10:2.12.0-33.el7
  • qemu-kvm-tools-rhev openstack 14, openstack 13, openstack 10 10:2.12.0-33.el7
  • qemu-kvm-common-rhev openstack 14, openstack 13, openstack 10 10:2.12.0-33.el7

red hat advisories RHSA-2019:2892RHSA-2019:2425RHSA-2019:1883RHSA-2019:1968

  • kvm SLE Point of Sale 11 SP3 1.4.2-53.38.1
  • qemu SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 2.9.1-6.44.1
  • qemu SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 2.6.2-41.59.1
  • qemu SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 2.11.2-9.36.1
  • qemu SLES for SAP 12 SP4, SLES 12 SP4 2.11.2-5.26.1
  • qemu SLES for SAP 12 SP5, SLES 12 SP5 3.1.1.1-3.9.1
  • qemu SLE Module for Server Applications 15 SP1, SLE Module for Basesystem 15 SP1 3.1.1.1-9.14.1
  • slirp4netns SLE Module for Containers 15 SP1 0.3.0-3.3.3

suse advisories SUSE-SU-2021:14706-1SUSE-SU-2020:14396-1SUSE-SU-2020:1538-1SUSE-SU-2020:1526-1SUSE-SU-2020:1523-1SUSE-SU-2020:1514-1

  • qemu openSUSE Tumbleweed 6.1.0-32.1
  • slirp4netns openSUSE Tumbleweed 1.1.11-1.2
  • qemu openSUSE Leap 15.1 3.1.1.1-lp151.7.12.1
  • qemu-linux-user openSUSE Leap 15.1 3.1.1.1-lp151.7.12.1
  • slirp4netns openSUSE Leap 15.1 0.3.0-lp151.2.3.1
  • libcontainers-common openSUSE Leap 15.1 20190401-lp151.2.3.1
  • fuse3 openSUSE Leap 15.1 3.6.1-lp151.2.1
  • podman openSUSE Leap 15.1 1.4.4-lp151.3.3.1

opensuse advisories openSUSE-SU-2024:11287-1openSUSE-SU-2024:11387-1openSUSE-SU-2020:0468-1openSUSE-SU-2019:2044-1

Is CVE-2019-6778 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2019-6778 updated cvss 7.8

QEMU: slirp: heap buffer overflow in tcp_emu()

  • Red Hat Enterprise Linux 5 kvm
    affected: no fix planned “Will not fix”
  • 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 “Out of support scope”
  • Red Hat Enterprise Linux Client (v. 7) qemu-img 1.5.3-160.el7_6.3, qemu-kvm 1.5.3-160.el7_6.3, qemu-kvm-tools 1.5.3-160.el7_6.3, qemu-kvm-common 1.5.3-160.el7_6.3 Red Hat Enterprise Linux ComputeNode Optional (v. 7) qemu-img 1.5.3-160.el7_6.3, qemu-kvm 1.5.3-160.el7_6.3, qemu-kvm-tools 1.5.3-160.el7_6.3, qemu-kvm-common 1.5.3-160.el7_6.3
    fixed: vendor fix RHSA-2019:1883
  • Red Hat Enterprise Linux Desktop (v. 6) qemu-img 0.12.1.2-2.506.el6_10.5, qemu-kvm 0.12.1.2-2.506.el6_10.5, qemu-kvm-tools 0.12.1.2-2.506.el6_10.5, qemu-guest-agent 0.12.1.2-2.506.el6_10.5 Red Hat Enterprise Linux HPC Node (v. 6) qemu-img 0.12.1.2-2.506.el6_10.5, qemu-kvm 0.12.1.2-2.506.el6_10.5, qemu-kvm-tools 0.12.1.2-2.506.el6_10.5, qemu-guest-agent 0.12.1.2-2.506.el6_10.5 Red Hat Enterprise Linux Server (v. 6) qemu-img 0.12.1.2-2.506.el6_10.5, qemu-kvm 0.12.1.2-2.506.el6_10.5, qemu-kvm-tools 0.12.1.2-2.506.el6_10.5, qemu-guest-agent 0.12.1.2-2.506.el6_10.5
    fixed: vendor fix RHSA-2019:2892
  • Red Hat Enterprise Linux Server (v. 7) qemu-img 1.5.3-160.el7_6.3, qemu-kvm 1.5.3-160.el7_6.3, qemu-kvm-tools 1.5.3-160.el7_6.3, qemu-kvm-common 1.5.3-160.el7_6.3
    fixed: vendor fix RHSA-2019:1883
  • Red Hat Enterprise Linux Workstation (v. 6) qemu-img 0.12.1.2-2.506.el6_10.5, qemu-kvm 0.12.1.2-2.506.el6_10.5, qemu-kvm-tools 0.12.1.2-2.506.el6_10.5, qemu-guest-agent 0.12.1.2-2.506.el6_10.5
    fixed: vendor fix RHSA-2019:2892
  • Red Hat Enterprise Linux Workstation (v. 7) qemu-img 1.5.3-160.el7_6.3, qemu-kvm 1.5.3-160.el7_6.3, qemu-kvm-tools 1.5.3-160.el7_6.3, qemu-kvm-common 1.5.3-160.el7_6.3
    fixed: vendor fix RHSA-2019:1883
  • 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
show 2 more
  • Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts qemu-img-rhev 2.12.0-18.el7_6.7, qemu-kvm-rhev 2.12.0-18.el7_6.7, qemu-kvm-tools-rhev 2.12.0-18.el7_6.7, qemu-kvm-common-rhev 2.12.0-18.el7_6.7 Red Hat RHV-M 4.2 qemu-img-rhev 2.12.0-18.el7_6.7, qemu-kvm-rhev 2.12.0-18.el7_6.7, qemu-kvm-tools-rhev 2.12.0-18.el7_6.7, qemu-kvm-common-rhev 2.12.0-18.el7_6.7 Red Hat RHV-M 4.3 qemu-img-rhev 2.12.0-18.el7_6.7, qemu-kvm-rhev 2.12.0-18.el7_6.7, qemu-kvm-tools-rhev 2.12.0-18.el7_6.7, qemu-kvm-common-rhev 2.12.0-18.el7_6.7
    fixed: vendor fix RHSA-2019:1968
  • Red Hat Enterprise Linux 5 xen 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

0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Intel 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.