CVE-2019-20795

Severity: medium (CVSS 4.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-05-09 · updated 2026-10-14
Weakness: CWE-416

Description

iproute2 before 5.1.0 has a use-after-free in get_netnsid_from_name in ip/ipnetns.c. NOTE: security relevance may be limited to certain uses of setuid that, although not a default, are sometimes a configuration option offered to end users. Even when setuid is used, other factors (such as C library configuration) may block exploitability.

Affected products

Canonical Ubuntu Linux: 18.04
Iproute2 Project Iproute2: before 5.1.0 — fixed in 5.1.0

How to fix

Upgrade to a fixed version: Iproute2 Project Iproute2 5.1.0. Check the vendor advisory for mitigations.

References

https://bugzilla.suse.com/show_bug.cgi?id=1171452
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=9bf2c538a0eb10d66e2365a655bf6c52f5ba3d10
https://security.gentoo.org/glsa/202008-06
https://usn.ubuntu.com/4357-1/
https://bugzilla.suse.com/show_bug.cgi?id=1171452
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=9bf2c538a0eb10d66e2365a655bf6c52f5ba3d10
https://security.gentoo.org/glsa/202008-06
https://usn.ubuntu.com/4357-1/
https://cert-portal.siemens.com/productcert/html/ssa-398330.html

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