Use-after-free in Linux kernel - CVE-2026-74565

Vulnerability details

The vulnerability allows a local user to cause a denial of service or execute arbitrary code.

The vulnerability exists due to use-after-free in nft_object lookup handling in nf_tables when accessing objects during net namespace event processing. A local user can trigger object lookup and destruction across tables to cause a denial of service or execute arbitrary code.

The issue arises because a global object name rhltable could expose objects being dismantled from the lookup path by another existing network namespace.

Affected software

How to mitigate CVE-2026-74565

External References

• https://git.kernel.org/stable/c/1948e4f85b855618b5b9a27265f98d816f4cb7cb
• https://git.kernel.org/stable/c/63ba12b664a2cd3220ed43e22c717715f4cc2ae8
• https://git.kernel.org/stable/c/7d4789b58761d9d48d9b5f5e7e0a510c3bbfb3af
• https://git.kernel.org/stable/c/f4f699790590bd0896c48a71e9232a65198f92f0

Related Security Bulletins

• Use-after-free in Linux kernel netfilter
• Debian update for linux