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CVE-2025-21648 – “Linux Netfilter Conntrack INT_MAXHashtable Vulnerability”

The following table lists the changes that have been made to the
CVE-2025-21648 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jan. 19, 2025

    Action Type Old Value New Value
    Added 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.
    Added Reference https://git.kernel.org/stable/c/5552b4fd44be3393b930434a7845d8d95a2a3c33
    Added Reference https://git.kernel.org/stable/c/b541ba7d1f5a5b7b3e2e22dc9e40e18a7d6dbc13
    Added Reference https://git.kernel.org/stable/c/d5807dd1328bbc86e059c5de80d1bbee9d58ca3d
    Added Reference https://git.kernel.org/stable/c/f559357d035877b9d0dcd273e0ff83e18e1d46aa
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