VulnerabilityPublished 30 Apr 2026Updated 6 Nov 2026

CVE-2026-31692: Linux kernel · rtnetlink: add missing netlink_ns_capable() check for peer netns

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in d04cc16d3624218a5458b2b664ae431f1b3b334d : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:04 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in d04cc16d3624218a5458b2b664ae431f1b3b334d, 0975b64ffb34560042090a5986c3a02e6c80f36f, 7b735ef81286007794a227ce2539419479c02a5f

Exploitation evidence

Disclosed: evidence found.
CVE published 30 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to d04cc16d3624218a5458b2b664ae431f1b3b334d, 0975b64ffb34560042090a5986c3a02e6c80f36f or 7b735ef81286007794a227ce2539419479c02a5f.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 81adee47dfb608df3ad0b91d230fb3cef75f0060, < d04cc16d3624218a5458b2b664ae431f1b3b334d	Fixed in d04cc16d3624218a5458b2b664ae431f1b3b334d
LinuxLinux	Affected ≥ 81adee47dfb608df3ad0b91d230fb3cef75f0060, < 0975b64ffb34560042090a5986c3a02e6c80f36f	Fixed in 0975b64ffb34560042090a5986c3a02e6c80f36f
LinuxLinux	Affected ≥ 81adee47dfb608df3ad0b91d230fb3cef75f0060, < 7b735ef81286007794a227ce2539419479c02a5f	Fixed in 7b735ef81286007794a227ce2539419479c02a5f
LinuxLinux	Affected =2.6.33	Fixed in–

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.

References

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