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Fencer Intel
high 8.2

CVE-2018-11806 json

m_cat in slirp/mbuf.c in Qemu has a heap-based buffer overflow via incoming fragmented datagrams.

published 8y ago modified 4mo ago also EUVD-2018-3798

cvss
8.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

m_cat in slirp/mbuf.c in Qemu has a heap-based buffer overflow via incoming fragmented datagrams.

Patch / fix

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

debian advisories DEBIAN-CVE-2018-11806

  • 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-2018-11806

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 RHEL 7 10:1.5.3-156.el7_5.5
  • qemu-img RHEL 7 10:1.5.3-156.el7_5.5
  • qemu-kvm-tools RHEL 7 10:1.5.3-156.el7_5.5
  • qemu-kvm-common RHEL 7 10:1.5.3-156.el7_5.5

red hat advisories RHSA-2019:2892RHSA-2018:2462RHSA-2018:2887RHSA-2018:2822RHSA-2018:2762

  • qemu SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 2.9.1-6.19.11
  • qemu SLES 12 SP2-BCL, OpenStack Cloud 7, Enterprise Storage 4 +2 more 2.6.2-41.43.3
  • xen SLES 12 SP2-BCL, OpenStack Cloud 7, Enterprise Storage 4 +2 more 4.7.6_02-43.36.1
  • kvm SLES for SAP 11 SP4, SLES 11 SP4 1.4.2-60.15.2
  • kvm SLES 11 SP3-TERADATA, SLES 11 SP3-LTSS, SLE Point of Sale 11 SP3 1.4.2-53.23.2
  • xen SLES 11 SP3-LTSS, SLE Point of Sale 11 SP3 4.2.5_21-45.25.1
  • qemu SLE Module for Server Applications 15, SLE Module for Basesystem 15 2.11.2-9.4.1
  • xen SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +1 more 4.9.2_08-3.35.2

suse advisories SUSE-SU-2018:3555-1SUSE-SU-2018:2973-2SUSE-SU-2018:2081-2SUSE-SU-2018:2973-1SUSE-SU-2018:2650-1SUSE-SU-2018:2615-1

  • qemu openSUSE Tumbleweed 6.1.0-32.1

opensuse advisories openSUSE-SU-2024:11287-1

Is CVE-2018-11806 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-2018-11806 updated cvss 5.1

QEMU: slirp: heap buffer overflow while reassembling fragmented datagrams

  • Red Hat Enterprise Linux 5 kvm Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) 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 Enterprise Linux Client (v. 7) qemu-img 1.5.3-156.el7_5.5, qemu-kvm 1.5.3-156.el7_5.5, qemu-kvm-tools 1.5.3-156.el7_5.5, qemu-kvm-common 1.5.3-156.el7_5.5 Red Hat Enterprise Linux ComputeNode Optional (v. 7) qemu-img 1.5.3-156.el7_5.5, qemu-kvm 1.5.3-156.el7_5.5, qemu-kvm-tools 1.5.3-156.el7_5.5, qemu-kvm-common 1.5.3-156.el7_5.5
    fixed: vendor fix RHSA-2018:2462
  • 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
    fixed: vendor fix RHSA-2019:2892
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) qemu-img-ma 2.10.0-21.el7_5.4, qemu-kvm-ma 2.10.0-21.el7_5.4, qemu-kvm-tools-ma 2.10.0-21.el7_5.4, qemu-kvm-common-ma 2.10.0-21.el7_5.4 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) qemu-img-ma 2.10.0-21.el7_5.4, qemu-kvm-ma 2.10.0-21.el7_5.4, qemu-kvm-tools-ma 2.10.0-21.el7_5.4, qemu-kvm-common-ma 2.10.0-21.el7_5.4
    fixed: vendor fix RHSA-2018:2762
  • 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 1.5.3-156.el7_5.5, qemu-kvm 1.5.3-156.el7_5.5, qemu-img-ma 2.10.0-21.el7_5.4, qemu-kvm-ma 2.10.0-21.el7_5.4, qemu-kvm-tools 1.5.3-156.el7_5.5, qemu-kvm-common 1.5.3-156.el7_5.5, +2 more
    fixed: vendor fix RHSA-2018:2462
  • Red Hat Enterprise Linux Server Optional (v. 7) qemu-kvm-ma 2.10.0-21.el7_5.4, qemu-kvm-tools-ma 2.10.0-21.el7_5.4, qemu-kvm-common-ma 2.10.0-21.el7_5.4
    fixed: vendor fix RHSA-2018:2762
  • 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
show 4 more
  • Red Hat Enterprise Linux Workstation (v. 7) qemu-img 1.5.3-156.el7_5.5, qemu-kvm 1.5.3-156.el7_5.5, qemu-kvm-tools 1.5.3-156.el7_5.5, qemu-kvm-common 1.5.3-156.el7_5.5
    fixed: vendor fix RHSA-2018:2462
  • Red Hat OpenStack Platform 8.0 (Liberty) qemu-img-rhev 2.10.0-21.el7_5.6, qemu-kvm-rhev 2.10.0-21.el7_5.6, qemu-kvm-tools-rhev 2.10.0-21.el7_5.6, qemu-kvm-common-rhev 2.10.0-21.el7_5.6 Red Hat OpenStack Platform 9.0 qemu-img-rhev 2.10.0-21.el7_5.6, qemu-kvm-rhev 2.10.0-21.el7_5.6, qemu-kvm-tools-rhev 2.10.0-21.el7_5.6, qemu-kvm-common-rhev 2.10.0-21.el7_5.6 Red Hat OpenStack Platform 10.0 qemu-img-rhev 2.10.0-21.el7_5.6, qemu-kvm-rhev 2.10.0-21.el7_5.6, qemu-kvm-tools-rhev 2.10.0-21.el7_5.6, qemu-kvm-common-rhev 2.10.0-21.el7_5.6 Red Hat OpenStack Platform 12.0 qemu-img-rhev 2.10.0-21.el7_5.6, qemu-kvm-rhev 2.10.0-21.el7_5.6, qemu-kvm-tools-rhev 2.10.0-21.el7_5.6, qemu-kvm-common-rhev 2.10.0-21.el7_5.6 Red Hat OpenStack Platform 13.0 qemu-img-rhev 2.10.0-21.el7_5.6, qemu-kvm-rhev 2.10.0-21.el7_5.6, qemu-kvm-tools-rhev 2.10.0-21.el7_5.6, qemu-kvm-common-rhev 2.10.0-21.el7_5.6
    fixed: vendor fix RHSA-2018:2822
  • Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts qemu-img-rhev 2.10.0-21.el7_5.7, qemu-kvm-rhev 2.10.0-21.el7_5.7, qemu-kvm-tools-rhev 2.10.0-21.el7_5.7, qemu-kvm-common-rhev 2.10.0-21.el7_5.7
    fixed: vendor fix RHSA-2018:2887
  • 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

0.81% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 8.2 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

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.