QEMU 4.1.0 has a memory leak in zrle_compress_data in ui/vnc-enc-zrle.c during a VNC disconnect operation because libz is misused, resultin…

published 2020-03-05 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-10934

cvss: 3.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits: 0; none known

QEMU 4.1.0 has a memory leak in zrle_compress_data in ui/vnc-enc-zrle.c during a VNC disconnect operation because libz is misused, resulting in a situation where memory allocated in deflateInit2 is not freed in deflateEnd.

Patch / fix

distros 7 links 1

debian ubuntu red hat suse opensuse almalinux rocky linux

qemu Debian 14, Debian 13, Debian 12 1:4.2-1

debian advisories DEBIAN-CVE-2019-20382

qemu Ubuntu 16.04 LTS 1:2.5+dfsg-5ubuntu10.44
qemu Ubuntu 18.04 LTS 1:2.11+dfsg-1ubuntu7.26
qemu Ubuntu Pro 14.04 LTS 2.0.0+dfsg-2ubuntu1.47+esm4

ubuntu advisories UBUNTU-CVE-2019-20382

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

SLOF RHEL 8 20171214-6.gitfa98132.module+el8.1.0+4066+0f1aadab
hivex RHEL 8 1.3.15-7.module+el8.1.0+4066+0f1aadab
netcf RHEL 8 0.2.8-12.module+el8.1.0+4066+0f1aadab
nbdkit RHEL 8 1.4.2-5.module+el8.1.0+4066+0f1aadab
libvirt RHEL 8 4.5.0-42.module+el8.2.0+6024+15a2423f
seabios RHEL 8 1.11.1-4.module+el8.1.0+4066+0f1aadab
sgabios RHEL 8 1:0.20170427git-3.module+el8.1.0+4066+0f1aadab
libiscsi RHEL 8 1.18.0-8.module+el8.1.0+4066+0f1aadab

red hat advisories RHSA-2020:2774 RHSA-2020:4167 RHSA-2020:3907 RHSA-2020:3906 RHSA-2020:3267

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

suse advisories SUSE-SU-2020:1523-1 SUSE-SU-2020:1501-1 SUSE-SU-2020:0845-1 SUSE-SU-2020:0844-1

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

opensuse advisories openSUSE-SU-2020:0468-1

netcf AlmaLinux 8 0.2.8-12.module_el8.5.0+2608+72063365
netcf AlmaLinux 8 0.2.8-12.module_el8.6.0+2880+7d9e3703
netcf AlmaLinux 8 0.2.8-12.module_el8.3.0+2048+e7a0a3ea
sgabios AlmaLinux 8 1:0.20170427git-3.module_el8.5.0+2608+72063365
sgabios AlmaLinux 8 1:0.20170427git-3.module_el8.3.0+2048+e7a0a3ea
libiscsi AlmaLinux 8 1.18.0-8.module_el8.6.0+2880+7d9e3703
libiscsi AlmaLinux 8 1.18.0-8.module_el8.5.0+2608+72063365
libiscsi AlmaLinux 8 1.18.0-8.module_el8.3.0+2048+e7a0a3ea

almalinux advisories ALSA-2020:2774

netcf Rocky Linux 8 0.2.8-12.module+el8.7.0+1084+97b81f61
netcf Rocky Linux 8 0.2.8-12.module+el8.4.0+534+4680a14e
netcf Rocky Linux 8 0.2.8-12.module+el8.6.0+847+b490afdd
sgabios Rocky Linux 8 1:0.20170427git-3.module+el8.7.0+1084+97b81f61
sgabios Rocky Linux 8 1:0.20170427git-3.module+el8.4.0+534+4680a14e
sgabios Rocky Linux 8 1:0.20170427git-3.module+el8.6.0+847+b490afdd
libiscsi Rocky Linux 8 1.18.0-8.module+el8.7.0+1084+97b81f61
libiscsi Rocky Linux 8 1.18.0-8.module+el8.4.0+534+4680a14e

rocky linux advisories RLSA-2020:2774

openwall.com/lists/oss-security/2020/03/05/1 advisory

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-2019-20382 updated 2026-11-06 cvss 3.5

QEMU: vnc: memory leakage upon disconnect

Red Hat Enterprise Linux 8 Advanced Virtualization qemu-img, qemu-kvm, qemu-kiwi, qemu-kvm-core, qemu-kvm-tests, qemu-kvm-common, +9 more
affected: no fix available
Red Hat OpenStack Platform 10 (Newton) qemu-img-rhev, qemu-kvm-rhev, qemu-kvm-tools-rhev, qemu-kvm-common-rhev
affected: no fix available “Fix deferred”
Red Hat CodeReady Linux Builder (v. 8) hivex 1.3.15-7.module+el8.1.0+4066+0f1aadab, netcf 0.2.8-12.module+el8.1.0+4066+0f1aadab, libvirt 4.5.0-42.module+el8.2.0+6024+15a2423f, seabios 1.11.1-4.module+el8.1.0+4066+0f1aadab, libiscsi 1.18.0-8.module+el8.1.0+4066+0f1aadab, netcf-libs 0.2.8-12.module+el8.1.0+4066+0f1aadab, +34 more Red Hat Enterprise Linux AppStream (v. 8) hivex 1.3.15-7.module+el8.1.0+4066+0f1aadab, nbdkit 1.4.2-5.module+el8.1.0+4066+0f1aadab, netcf 0.2.8-12.module+el8.1.0+4066+0f1aadab, libvirt 4.5.0-42.module+el8.2.0+6024+15a2423f, seabios 1.11.1-4.module+el8.1.0+4066+0f1aadab, libiscsi 1.18.0-8.module+el8.1.0+4066+0f1aadab, +80 more
fixed: vendor fix RHSA-2020:2774
Red Hat Enterprise Linux Client (v. 7) qemu-img 1.5.3-175.el7, qemu-kvm 1.5.3-175.el7, qemu-kvm-tools 1.5.3-175.el7, qemu-kvm-common 1.5.3-175.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) qemu-img 1.5.3-175.el7, qemu-kvm 1.5.3-175.el7, qemu-kvm-tools 1.5.3-175.el7, qemu-kvm-common 1.5.3-175.el7 Red Hat Enterprise Linux Server (v. 7) qemu-img 1.5.3-175.el7, qemu-kvm 1.5.3-175.el7, qemu-img-ma 2.12.0-48.el7, qemu-kvm-ma 2.12.0-48.el7, qemu-kvm-tools 1.5.3-175.el7, qemu-kvm-common 1.5.3-175.el7, +2 more
fixed: vendor fix RHSA-2020:3906
Red Hat Enterprise Linux Server Optional (v. 7) qemu-kvm-ma 2.12.0-48.el7, qemu-kvm-tools-ma 2.12.0-48.el7, qemu-kvm-common-ma 2.12.0-48.el7
fixed: vendor fix RHSA-2020:3907
Red Hat Enterprise Linux Workstation (v. 7) qemu-img 1.5.3-175.el7, qemu-kvm 1.5.3-175.el7, qemu-kvm-tools 1.5.3-175.el7, qemu-kvm-common 1.5.3-175.el7
fixed: vendor fix RHSA-2020:3906
Red Hat OpenStack Platform 13.0 qemu-img-rhev 2.12.0-48.el7_9.1, qemu-kvm-rhev 2.12.0-48.el7_9.1, qemu-kvm-tools-rhev 2.12.0-48.el7_9.1, qemu-kvm-common-rhev 2.12.0-48.el7_9.1 Red Hat OpenStack Platform 13.0 for RHEL 7.6 EUS Server qemu-img-rhev 2.12.0-18.el7_6.12, qemu-kvm-rhev 2.12.0-18.el7_6.12, qemu-kvm-tools-rhev 2.12.0-18.el7_6.12, qemu-kvm-common-rhev 2.12.0-18.el7_6.12
fixed: vendor fix RHSA-2020:4167
Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts qemu-img-rhev 2.12.0-48.el7, qemu-kvm-rhev 2.12.0-48.el7, qemu-kvm-tools-rhev 2.12.0-48.el7, qemu-kvm-common-rhev 2.12.0-48.el7 Red Hat RHV-M 4.3 qemu-img-rhev 2.12.0-48.el7, qemu-kvm-rhev 2.12.0-48.el7, qemu-kvm-tools-rhev 2.12.0-48.el7, qemu-kvm-common-rhev 2.12.0-48.el7
fixed: vendor fix RHSA-2020:3267

show 1 more

Red Hat Enterprise Linux 5 kvm, xen Red Hat Enterprise Linux 6 qemu-img, qemu-kvm, qemu-kvm-tools, qemu-guest-agent, qemu-guest-agent-win32
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

0.87% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	3.5	CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD	2.0	2.7	AV:A/AC:L/Au:S/C:N/I:N/A:P

Classification

Weakness

CWE-401 Missing Release of Memory after Effective Lifetime

References

openwall.com /lists/oss-security/2020/03/05/1
mailing-list, patch, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2020-04/msg00007.html
vendor-advisory, broken-link, third-party-advisory
debian.org /security/2020/dsa-4665
vendor-advisory, third-party-advisory
usn.ubuntu.com /4372-1/
vendor-advisory, third-party-advisory
git.qemu.org /?p=qemu.git%3Ba=commit%3Bh=6bf21f3d83e95bcc4ba35a7a07cc6655e8b010b0
lists.debian.org /debian-lts-announce/2020/07/msg00020.html
mailing-list, third-party-advisory

Sources

CVE List CVE-2019-20382
NVD CVE-2019-20382

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.

Summary