Race condition in Linux kernel - CVE-2026-31406

Vulnerability identifier: #VU124960

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-2026-31406

CWE-ID: CWE-362

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 a race condition in xfrm_nat_keepalive_net_fini() and nat_keepalive_work when cleaning up network namespaces. A local user can trigger network namespace cleanup to cause a denial of service.

The issue occurs because delayed work may be re-scheduled after cancellation and then execute on a freed net structure.

Linux kernel
Debian Linux
SUSE Linux Micro
kernel-livepatch-SLE16_Update_11-debugsource
kernel-livepatch-6_12_0-160000_32-default-debuginfo
kernel-livepatch-6_12_0-160000_32-default
kernel-livepatch-6_12_0-160000_31-default
kernel-livepatch-SLE16_Update_10-debugsource
kernel-livepatch-6_12_0-160000_31-default-debuginfo
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-SLE16_Update_11-debugsource - update to 2-160000.1.1
kernel-livepatch-6_12_0-160000_32-default-debuginfo - update to 2-160000.1.1
kernel-livepatch-6_12_0-160000_32-default - update to 2-160000.1.1
kernel-livepatch-6_12_0-160000_31-default - update to 2-160000.1.1
kernel-livepatch-SLE16_Update_10-debugsource - update to 2-160000.1.1
kernel-livepatch-6_12_0-160000_31-default-debuginfo - update to 2-160000.1.1
linux (Debian package) - update to 6.12.85-1

• https://git.kernel.org/stable/c/21f2fc49ca6faa393c31da33b8a4e6c41fc84c13
• https://git.kernel.org/stable/c/2255ed6adbc3100d2c4a83abd9d0396d04b87792
• https://git.kernel.org/stable/c/32d0f44c2f14d60fe8e920e69a28c11051543ec1
• https://git.kernel.org/stable/c/daf8e3b253aa760ff9e96c7768a464bc1d6b3c90

• Race condition in Linux kernel xfrm
• Debian update for linux
• SUSE update for the Linux Kernel (Live Patch 11 for SUSE Linux Enterprise 16)
• SUSE update for the Linux Kernel (Live Patch 10 for SUSE Linux Enterprise 16)