Improper locking in Linux kernel - CVE-2026-31579

Vulnerability identifier: #VU127820

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-31579

CWE-ID: CWE-667

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper locking in wg_netns_pre_exit() when handling network namespace cleanup. A local user can trigger network namespace teardown while another thread holds rtnl_mutex to cause a denial of service.

The issue can cause the cleanup path to block indefinitely, resulting in a hung task.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-realtime (Ubuntu package)
linux-oracle (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-ibm (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-27.27
linux-realtime (Ubuntu package) - update to 7.0.0-27.27.1
linux-oracle (Ubuntu package) - update to 7.0.0-1007.7
linux-aws (Ubuntu package) - update to 7.0.0-1008.8
linux-gcp (Ubuntu package) - update to 7.0.0-1007.7
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14
linux-azure (Ubuntu package) - update to 7.0.0-1010.10
linux-nvidia (Ubuntu package) - update to 7.0.0-1013.13
linux-ibm (Ubuntu package) - update to 7.0.0-1009.9
linux-azure-fde (Ubuntu package) - update to 7.0.0-1009.9
linux (Debian package) - update to 6.12.115-2

• https://git.kernel.org/stable/c/1c52ef00e391144334f10995985c2f256d4be982
• https://git.kernel.org/stable/c/9a9e69155b2091b8297afaf1533b8d68a3096841
• https://git.kernel.org/stable/c/a1d0f6cbb962af29586e3e65a4bced1a5e39221f

• Improper locking in Linux kernel net wireguard driver
• Ubuntu update for linux
• Ubuntu update for linux-raspi
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure
• Debian update for linux