CVE-2017-15129: Canonical Ubuntu Linux

Medium severity, CVSS 4.7. EPSS: 0.4% chance of exploitation in the next 30 days.

A use-after-free vulnerability was found in network namespaces code affecting the Linux kernel before 4.14.11. The function get_net_ns_by_id() in net/core/net_namespace.c does not check for the net::count value after it has found a peer network in netns_ids idr, which could lead to double free and memory corruption. This vulnerability could allow an unprivileged local user to induce kernel memory corruption on the system, leading to a crash. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although it is thought to be unlikely.

Affected products

Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 17.10 only
Fedoraproject Fedora: version 27 only
Linux Linux Kernel: from 4.0, before 4.14.11 (fixed in 4.14.11); version 4.15 only
Red Hat Enterprise Linux: version 7.0 only
Red Hat Enterprise Linux Compute Node Eus: version 7.4 only
Red Hat Enterprise Linux Desktop: version 7.0 only
Red Hat Enterprise Linux Eus: version 7.4 only; version 7.6 only; version 7.7 only
Red Hat Enterprise Linux For IBM Z Systems: version 7.0 only
Red Hat Enterprise Linux For IBM Z Systems Eus: version 7.4 only
Red Hat Enterprise Linux For Power Big Endian: version 7.0 only
Red Hat Enterprise Linux For Power Big Endian Eus: version 7.4 only
Red Hat Enterprise Linux For Power Little Endian Eus: version 7.4 only
Red Hat Enterprise Linux For Real Time: version 7.0 only
Red Hat Enterprise Linux For Real Time For Nfv: version 7 only
Red Hat Enterprise Linux For Scientific Computing: version 7.0 only
Red Hat Enterprise Linux Server: version 7.0 only
Red Hat Enterprise Linux Server Aus: version 7.4 only
Red Hat Enterprise Linux Server Tus: version 7.4 only; version 7.6 only; version 7.7 only
Red Hat Enterprise Linux Server Update Services For SAP Solutions: version 7.4 only
Red Hat Enterprise Linux Workstation: version 7.0 only

Published 2018-01-09. Last modified 2026-06-17.