CVE-2026-31579

A flaw was found in the Linux kernel's WireGuard component. A local user could trigger a hung task by causing contention for the rtnl_lock() within the wg_netns_pre_exit() callback. This issue can lead to a Denial of Service (DoS), where the system becomes unresponsive as cleanup operations block indefinitely.

This Moderate flaw in the Linux kernel's WireGuard component allows a local attacker to trigger a Denial of Service. A local user can cause a hung task by creating contention for the rtnl_lock() during network namespace teardown. This vulnerability affects Red Hat Enterprise Linux 9 and 10.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, if the WireGuard VPN is not actively used, the wireguard kernel module can be prevented from loading. This can be achieved by creating a blacklist rule in /etc/modprobe.d/.

Example: echo "blacklist wireguard" | sudo tee /etc/modprobe.d/blacklist-wireguard.conf sudo dracut -f

A system reboot is required for the changes to take effect. This action will disable all WireGuard VPN functionality on the system.