HOMEVULNERABILITIESCVE-2026-31692
MEDIUM

CVE-2026-31692

Published: April 30, 2026· Updated: May 6, 2026

5.5
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:6.3th

Official Description

In the Linux kernel, the following vulnerability has been resolved:

rtnetlink: add missing netlink_ns_capable() check for peer netns

rtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer

network namespace when creating paired devices (veth, vxcan,

netkit). This allows an unprivileged user with a user namespace

to create interfaces in arbitrary network namespaces, including

init_net.

Add a netlink_ns_capable() check for CAP_NET_ADMIN in the peer

namespace before allowing device creation to proceed.

NVD Source

Technical Analysis

CVE-2026-31692 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Linux1 product
linux kernel
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://git.kernel.org/stable/c/0975b64ffb34560042090a5986c3a02e6c80f36f
PATCHhttps://git.kernel.org/stable/c/7b735ef81286007794a227ce2539419479c02a5f
PATCHhttps://git.kernel.org/stable/c/d04cc16d3624218a5458b2b664ae431f1b3b334d

All References (3)

→
https://git.kernel.org/stable/c/0975b64ffb34560042090a5986c3a02e6c80f36fPatch
→
https://git.kernel.org/stable/c/7b735ef81286007794a227ce2539419479c02a5fPatch
→
https://git.kernel.org/stable/c/d04cc16d3624218a5458b2b664ae431f1b3b334dPatch

Quick Facts

CVE IDCVE-2026-31692
CVSS Score5.5 / 10
SeverityMEDIUM
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedApr 30, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-31692 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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