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Fencer Intel
low 2.1

CVE-2014-3640 json

The sosendto function in slirp/udp.c in QEMU before 2.1.2 allows local users to cause a denial of service (NULL pointer dereference) by sen…

published 2014-11-07 12 y ago modified 2026-06-17 4 mo ago also EUVD-2014-3598

cvss
2.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

The sosendto function in slirp/udp.c in QEMU before 2.1.2 allows local users to cause a denial of service (NULL pointer dereference) by sending a udp packet with a value of 0 in the source port and address, which triggers access of an uninitialized socket.

Patch / fix

  • qemu Debian 14, Debian 13, Debian 12 2.1+dfsg-5

debian advisories DEBIAN-CVE-2014-3640

  • qemu Ubuntu 14.04 LTS 2.0.0+dfsg-2ubuntu1.7

ubuntu advisories UBUNTU-CVE-2014-3640

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 RHEL 7 10:2.1.2-23.el7
  • qemu-img-rhev RHEL 7 10:2.1.2-23.el7
  • libcacard-rhev RHEL 7 10:2.1.2-23.el7
  • qemu-kvm-tools-rhev RHEL 7 10:2.1.2-23.el7
  • libcacard-devel-rhev RHEL 7 10:2.1.2-23.el7
  • libcacard-tools-rhev RHEL 7 10:2.1.2-23.el7
  • qemu-kvm-common-rhev RHEL 7 10:2.1.2-23.el7
  • qemu-kvm RHEL 7 10:1.5.3-86.el7

red hat advisories RHSA-2015:0624RHSA-2015:0349

  • xen SLES for SAP 12, SLES 12, SLED 12 +1 more 4.4.4_02-22.19.1
  • xen SLES for SAP 11 SP4, SLES 11 SP4, SLED 11 SP4 +1 more 4.4.4_02-32.1
  • xen SLES for SAP 12 SP1, SLES 12 SP1, SLED 12 SP1 +1 more 4.5.2_06-7.1
  • xen SLES 11 SP3-LTSS 4.2.5_20-24.9
  • xen SLES 11 SP2-LTSS 4.1.6_08-26.1

suse advisories SUSE-SU-2016:1745-1SUSE-SU-2016:1318-1SUSE-SU-2016:1154-1SUSE-SU-2016:0955-1SUSE-SU-2016:0873-1

  • xen openSUSE Tumbleweed 4.7.0_12-1.3

opensuse advisories openSUSE-SU-2024:10196-1

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-2014-3640 updated cvss 4.4

qemu: slirp: NULL pointer deref in sosendto()

  • Red Hat Enterprise Linux 6 qemu-img, qemu-kvm, qemu-kvm-tools, qemu-guest-agent, qemu-guest-agent-win32
    affected: no fix available
  • Red Hat Enterprise Linux Client (v. 7) qemu-img 1.5.3-86.el7, qemu-kvm 1.5.3-86.el7, libcacard 1.5.3-86.el7, qemu-kvm-tools 1.5.3-86.el7, qemu-kvm-common 1.5.3-86.el7 Red Hat Enterprise Linux Client Optional (v. 7) libcacard-tools 1.5.3-86.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) qemu-img 1.5.3-86.el7, qemu-kvm 1.5.3-86.el7, libcacard 1.5.3-86.el7, qemu-kvm-tools 1.5.3-86.el7, libcacard-tools 1.5.3-86.el7, qemu-kvm-common 1.5.3-86.el7 Red Hat Enterprise Linux Server (v. 7) qemu-img 1.5.3-86.el7, qemu-kvm 1.5.3-86.el7, libcacard 1.5.3-86.el7, qemu-kvm-tools 1.5.3-86.el7, qemu-kvm-common 1.5.3-86.el7 Red Hat Enterprise Linux Server Optional (v. 7) libcacard 1.5.3-86.el7, libcacard-tools 1.5.3-86.el7 Red Hat Enterprise Linux Workstation (v. 7) qemu-img 1.5.3-86.el7, qemu-kvm 1.5.3-86.el7, libcacard 1.5.3-86.el7, qemu-kvm-tools 1.5.3-86.el7, qemu-kvm-common 1.5.3-86.el7
    +1 more products
    Red Hat Enterprise Linux Workstation Optional (v. 7) libcacard-tools 1.5.3-86.el7
    fixed: vendor fix RHSA-2015:0349
  • Red Hat RHEV-H and VDSM for 7 Hosts qemu-img-rhev 2.1.2-23.el7, qemu-kvm-rhev 2.1.2-23.el7, libcacard-rhev 2.1.2-23.el7, qemu-kvm-tools-rhev 2.1.2-23.el7, libcacard-devel-rhev 2.1.2-23.el7, libcacard-tools-rhev 2.1.2-23.el7, +1 more
    fixed: vendor fix RHSA-2015:0624
  • Red Hat Enterprise Linux 5 kvm
    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

0.40% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:N/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.