Improper control of a resource through its lifetime in Linux kernel - CVE-2026-64078

Detailed vulnerability description

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

The vulnerability exists due to improper state management in the netfilter x_tables table unregistration logic when handling set/getsockopt operations during table teardown. A local user can trigger concurrent table access during module or network namespace teardown to cause a denial of service.

The issue occurs because a table detached during the pre-exit stage is no longer visible on the active per-network table list while teardown is still in progress.

How to mitigate CVE-2026-64078

Sources

• https://git.kernel.org/stable/c/8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf
• https://git.kernel.org/stable/c/86ee5bc9c0f0e652e19f395675a432de11b75514
• https://git.kernel.org/stable/c/b4597d5fd7d2f8cebfffd40dffb5e003cc78964c