Medium 5.5Published Apr 30, 2026

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

Updated under an hour ago (Oct 28, 2026, 4:30 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 81adee47dfb608df3ad0b91d230fb3cef75f0060 before 0975b64ffb34560042090a5986c3a02e6c80f36f; from 81adee47dfb608df3ad0b91d230fb3cef75f0060 before d04cc16d3624218a5458b2b664ae431f1b3b334d; 81adee47dfb608df3ad0b91d230fb3cef75f0060 builds before 7b735ef81286007794a227ce2539419479c02a5f	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.33 before 6.18.24; from 6.19 before 6.19.14; 7.0; 7.0; 7.0; 7.0; 7.0; 7.0; and 1 more ranges	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.