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Fencer Vulns
medium 6.5

CVE-2018-10839 json

Qemu emulator <= 3.0.0 built with the NE2000 NIC emulation support is vulnerable to an integer overflow, which could lead to buffer overflo…

published 2018-10-16 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-2908

cvss
6.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

Qemu emulator <= 3.0.0 built with the NE2000 NIC emulation support is vulnerable to an integer overflow, which could lead to buffer overflow issue. It could occur when receiving packets over the network. A user inside guest could use this flaw to crash the Qemu process resulting in DoS.

Patch / fix

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

debian advisories DEBIAN-CVE-2018-10839

  • 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-2018-10839

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

red hat advisories RHSA-2019:2892

  • 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
  • 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
  • qemu SLE Module for Server Applications 15, SLE Module for Basesystem 15 2.11.2-9.12.2

suse advisories SUSE-SU-2018:3973-2SUSE-SU-2019:14011-1SUSE-SU-2019:0827-1SUSE-SU-2019:0825-1SUSE-SU-2019:13921-1SUSE-SU-2018:4237-1

  • 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-2018-10839 updated cvss 6.5

QEMU: ne2000: integer overflow leads to buffer overflow issue

  • Red Hat Enterprise Linux 7 qemu-img, qemu-kvm, libcacard, qemu-kvm-rhev, qemu-kvm-tools, libcacard-tools, +2 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 Red Hat OpenStack Platform 10 (Newton) qemu-img-rhev, qemu-kvm-rhev, qemu-kvm-tools-rhev, qemu-kvm-common-rhev
    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 OpenStack Platform 13 (Queens) qemu-img-rhev, qemu-kvm-rhev, qemu-kvm-tools-rhev, qemu-kvm-common-rhev
    affected: no fix planned “Will not fix”
  • Red Hat OpenStack Platform 14 (Rocky) qemu-img-rhev, qemu-kvm-rhev, qemu-kvm-tools-rhev, qemu-kvm-common-rhev
    affected: no fix available
  • 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 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 5 kvm, xen Red Hat Enterprise Linux 7 qemu-img-ma, qemu-kvm-ma, qemu-kvm-tools-ma, qemu-kvm-common-ma 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

3.08% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • lists.gnu.org https://lists.gnu.org/archive/html/qemu-devel/2018-09/msg03273.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 6.5 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Affected products

  • The QEMU Project Qemu-kvm

Classification

Weakness
  • CWE-121 Stack-based Buffer Overflow
  • 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.