CVE-2019-11596

Description

In memcached before 1.5.14, a NULL pointer dereference was found in the "lru mode" and "lru temp_ttl" commands. This causes a denial of service when parsing crafted lru command messages in process_lru_command in memcached.c.

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗

Release	Package	Fixed in	Advisory
Debian 14	memcached	1.5.6-1.1	—
Debian 13	memcached	1.5.6-1.1	—
Debian 12	memcached	1.5.6-1.1	—

Ubuntu

Security tracker ↗

Release	Package	Fixed in	Advisory
Ubuntu 18.04 LTS	memcached	1.5.6-0ubuntu1.1	USN-3963-1

Red Hat

Security tracker ↗

Release	Package	Fixed in	Advisory
RHEL 8	memcached	1.5.9-3.el8	RHSA-2020:1576

Show 1 more (older releases, extended support, other products)

Release	Package	Fixed in	Advisory
Red Hat OpenStack 13	memcached	1.4.39-3.el7ost	RHSA-2020:5583

SUSE

Security tracker ↗

Release	Package	Fixed in	Advisory
SLES 15 SP1	memcached	1.5.6-4.5.30	SUSE-SU-2020:1381-1
SLES 12 SP5	memcached	1.4.39-4.11.2	SUSE-SU-2020:0843-1
SLES 12 SP4	memcached	1.4.39-4.11.2	SUSE-SU-2020:0843-1

Show 8 more (older releases, extended support, other products)

Release	Package	Fixed in	Advisory
SLES for SAP 12 SP5	memcached	1.4.39-4.11.2	SUSE-SU-2020:0843-1
SLES for SAP 12 SP4	memcached	1.4.39-4.11.2	SUSE-SU-2020:0843-1
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SUSE OpenStack Cloud 7	zookeeper	3.4.10-6.1	SUSE-RU-2020:2072-1
SUSE HPE Helion OpenStack 8	ardana-ansible	8.0+git.1583432621.24fa60e-3.70.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	ardana-barbican	8.0+git.1585152761.8ef3d61-4.33.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	ardana-db	8.0+git.1583944923.03cca6c-3.31.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	ardana-monasca	8.0+git.1583944894.38f023a-3.24.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	ardana-mq	8.0+git.1583944811.dc14403-3.19.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	ardana-neutron	8.0+git.1584715262.e4ea620-3.39.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	ardana-octavia	8.0+git.1585171918.418f5cf-3.26.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	ardana-tempest	8.0+git.1585311051.6ab5488-3.33.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	documentation-hpe-helion-openstack-user +5	8.20200319-1.23.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	memcached	1.5.17-3.3.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	openstack-manila	5.1.1~dev5-3.26.2	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	openstack-manila-doc	5.1.1~dev5-3.26.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	openstack-neutron	11.0.9~dev63-3.30.2	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	openstack-neutron-doc	11.0.9~dev63-3.30.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	openstack-nova	16.1.9~dev61-3.35.2	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	openstack-nova-doc	16.1.9~dev61-3.35.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	pdns	4.1.2-3.6.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	python-amqp	2.4.2-3.9.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-aodh	5.1.1~dev7-12.24.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-barbican	5.0.2~dev3-12.25.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-ceilometer	9.0.8~dev7-12.22.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-cinder	11.2.3~dev23-14.25.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-designate	5.0.3~dev7-12.23.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-freezer	5.0.0.0~xrc2~dev2-10.20.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-glance	15.0.3~dev3-12.23.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-heat	9.0.8~dev22-12.25.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-ironic	9.1.8~dev8-12.25.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-keystone	12.0.4~dev5-11.26.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-magnum	5.0.2_5.0.2_5.0.2~dev31-11.24.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-manila	5.1.1~dev5-12.29.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-monasca-ceilometer	1.5.1_1.5.1_1.5.1~dev3-8.20.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-murano	4.0.2~dev2-12.20.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-neutron	11.0.9~dev63-13.28.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-nova	16.1.9~dev61-11.26.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-octavia	1.0.6~dev3-12.25.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-sahara	7.0.5~dev4-11.24.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	venv-openstack-trove	8.0.2~dev2-11.24.1	SUSE-SU-2020:1066-1
SUSE HPE Helion OpenStack 8	zookeeper	3.4.10-3.6.1	SUSE-SU-2020:1066-1

openSUSE

Security tracker ↗

Release	Package	Fixed in	Advisory
openSUSE Leap 15.1	memcached	1.5.6-lp151.4.3.1	openSUSE-SU-2020:0721-1

Oracle Linux

Release	Package	Fixed in	Advisory
Oracle Linux 8	memcached	1.5.9-3.el8	ELSA-2020-1576

Advisories 10

RHSA-2020:5583 Red Hat Security Advisory: memcached security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
RHSA-2020:1576 Red Hat Security Advisory: memcached security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
USN-3963-1 memcached vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
openSUSE-SU-2020:0721-1 Security update for memcached SUSE / openSUSE Security Updates · Feb 4, 2026
SUSE-SU-2020:1190-1 Security update for ardana-ansible, ardana-barbican, ardana-cluster, ardana-db, ardana-designate, ardana-input-model, ardana-logging, ardana-monasca, ardana-mq, ardana-neutron, ardana-octavia, ardana-osconfig, ardana-tempest, ardana-tls, crowbar-core, crowbar-ha, crowbar-openstack, memcached, openstack-ceilometer, openstack-cinder, openstack-designate, openstack-heat, openstack-ironic, openstack-ironic-image, openstack-manila, openstack-neutron, openstack-nova, openstack-octavia, openstack-octav SUSE / openSUSE Security Updates · Feb 4, 2026
SUSE-RU-2020:2072-1 Security update for ansible, crowbar-core, crowbar-ha, crowbar-openstack, etcd, flannel, grafana, keepalived, kibana, memcached, monasca-installer, openstack-dashboard-theme-SUSE, openstack-manila, openstack-neutron-fwaas, openstack-nova, openstack-tempest, python-Django, python-Pillow, python-psql2mysql, python-psutil, python-py, python-pysaml2, python-waitress, rabbitmq-server, release-notes-suse-openstack-cloud, zookeeper SUSE / openSUSE Security Updates · Feb 4, 2026
SUSE-SU-2020:1066-1 Security update for ardana-ansible, ardana-barbican, ardana-db, ardana-monasca, ardana-mq, ardana-neutron, ardana-octavia, ardana-tempest, crowbar-core, crowbar-ha, crowbar-openstack, documentation-suse-openstack-cloud, memcached, openstack-manila, openstack-neutron, openstack-nova, pdns, python-amqp, rubygem-puma, zookeeper SUSE / openSUSE Security Updates · Feb 4, 2026
SUSE-SU-2020:1381-1 Security update for memcached SUSE / openSUSE Security Updates · Feb 4, 2026
SUSE-SU-2020:0843-1 Security update for memcached SUSE / openSUSE Security Updates · Feb 4, 2026
ELSA-2020-1576 Moderate: memcached security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 5, 2020

References

https://github.com/memcached/memcached/issues/474
https://github.com/memcached/memcached/commit/d35334f368817a77a6bd1f33c6a5676b2c402c02
https://github.com/memcached/memcached/compare/ee1cfe3...50bdc9f
USN-3963-1 vendor-advisory
FEDORA-2019-2bd8e73268 vendor-advisory
FEDORA-2019-df4c0ba2db vendor-advisory
openSUSE-SU-2020:0721 vendor-advisory

In memcached before 1.5.14, a NULL pointer dereference was found in the "lru mode" and "lru temp_ttl" commands. This causes a denial of ser…

Description

Fixed in Linux distributions

Debian

Ubuntu

Red Hat

SUSE

openSUSE

Oracle Linux

Advisories 10

References