Improper access control in Linux kernel - CVE-2026-31692
Published: April 30, 2026
Vulnerability identifier: #VU128648
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31692
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to create interfaces in arbitrary network namespaces.
The vulnerability exists due to improper access control in rtnl_newlink() when creating paired devices with a peer network namespace. A local user can create veth, vxcan, or netkit interfaces to create interfaces in arbitrary network namespaces.
Exploitation requires a user namespace.
How to mitigate CVE-2026-31692
Install security update from vendor's repository.