CVE-2025-21648 Information

Description

In the Linux kernel the following vulnerability has been resolved:

netfilter: conntrack: clamp maximum hashtable size to INT_MAX

Use INT_MAX as maximum size for the conntrack hashtable. Otherwise it is possible to hit WARN_ON_ONCE in __kvmalloc_node_noprof() when resizing hashtable because __GFP_NOWARN is unset. See:

0708a0afe291 (\mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls)

Note: hashtable resize is only possible from init_netns.

Reference

https://git.kernel.org/stable/c/5552b4fd44be3393b930434a7845d8d95a2a3c33 https://git.kernel.org/stable/c/b541ba7d1f5a5b7b3e2e22dc9e40e18a7d6dbc13 https://git.kernel.org/stable/c/d5807dd1328bbc86e059c5de80d1bbee9d58ca3d https://git.kernel.org/stable/c/f559357d035877b9d0dcd273e0ff83e18e1d46aa