Medium Memory corruption

CVE-2019-20795 — iproute2 before 5.1.0 has a use-after-free in get_netnsid_from_name in ip/ipnetns.c.

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.

Published May 9, 2020 · Updated Oct 14, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: mitre

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.4% (30-day exploitation probability)+5
Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.4%

ahead of 33% of scored CVEs · Oct 14, 2026

Affects

Canonical

Ubuntu Linux and 1 more

CVSS base

4.4

Medium · 1 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented patch — git.kernel.org (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Canonical Ubuntu Linux, Iproute2 Project Iproute2).
Apply the fixed version or the patch documented under Remediation.
Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Canonical	Ubuntu Linux	version 18.04	Vulnerable	NIST National Vulnerability Database
Iproute2 Project	Iproute2	< 5.1.0	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

High

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
4.4	CVSS 3.1	Medium	0.8	3.6	nvd@nist.gov via NIST National Vulnerability Database
2.1	CVSS 2.0	Low	3.9	2.9	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-416 · Use After Free

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.40%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.

endpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 14, 2026
Fix documented
Oct 14, 2026 · NIST National Vulnerability Database
Affected products added · iproute2 project/iproute2, canonical/ubuntu linux
Oct 14, 2026 · NIST National Vulnerability Database
CVSS changed · 4.4
Oct 14, 2026 · NIST National Vulnerability Database
Source status changed · → Modified
Oct 14, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 14, 2026 · Alertas do Telegram
2020
CVE published
May 9, 2020 · mitre

Source activity

Repeated readings are counted rather than listed.

2× References added · Oct 14, 2026 – Oct 14, 2026
1× Official description updated · Oct 14, 2026 – Oct 14, 2026

References

7 on the record

git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/
Patch, Third Party Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
security.gentoo.org/glsa/202008-06
Third Party Advisory, vendor-advisory, x_refsource_GENTOO, NIST National Vulnerability Database
cert-portal.siemens.com/productcert/html/ssa-398330.html
NIST National Vulnerability Database
usn.ubuntu.com/4357-1/
Third Party Advisory, vendor-advisory, x_refsource_UBUNTU, NIST National Vulnerability Database
bugzilla.suse.com/show_bug.cgi
Issue Tracking, Third Party Advisory, x_refsource_MISC, NIST National Vulnerability Database
github.com/advisories/GHSA-7x5p-w7r4-hq6m
GitHub Security Advisories
nvd.nist.gov/vuln/detail/CVE-2019-20795
GitHub Security Advisories

Elsewhere on this site

Canonical
every CVE for this vendor

Memory corruption
same class

CWE-416
other pages naming this weakness

Related CVEs (same products)

Low CVE-2026-47337 NULL pointer dereference in Ubuntu Linux AppArmor IPv4/IPv6 socket mediation May 28, 2026
High CVE-2026-47333 Out-of-bounds read in Ubuntu Linux AppArmor notification handling May 28, 2026
Medium CVE-2026-47334 Deadlock or kernel panic in Ubuntu Linux AppArmor notification handling May 28, 2026
Low CVE-2026-47336 Use of uninitialized value in Ubuntu Linux AppArmor IPv4/IPv6 socket mediation rules May 28, 2026
Medium CVE-2026-47335 NULL pointer dereference in Ubuntu Linux AppArmor notification handling May 28, 2026
Low CVE-2026-47330 Use of uninitialized value in Ubuntu Linux AppArmor notification handling May 28, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CISA SSVC assessment.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2019-20795 is "iproute2 before 5.1.0 has a use-after-free in get_netnsid_from_name in ip/ipnetns.c.", rated Medium. It affects Ubuntu Linux (Canonical); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.4 describes technical severity. EPSS 0.40% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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