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

What is CVE-2026-31692?

CVE-2026-31692 is a medium-severity vulnerability in Linux kernel, published on 30 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

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.

Which versions are affected by CVE-2026-31692?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-31692?

Apply the vendor's patch.

Is CVE-2026-31692 being exploited?

There is no known exploitation of CVE-2026-31692 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-85115, BELL-CVE-2026-31692, DEBIAN-CVE-2026-31692, GHSA-xpxm-p6f4-j2mf, ROOT-OS-DEBIAN-11-CVE-2026-31692, ROOT-OS-DEBIAN-12-CVE-2026-31692 and 4 more.