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CVE-2025-21648 is a Linux kernel netfilter conntrack flaw in maximum conntrack hashtable sizing. The maximum size was not constrained to INT_MAX. Resizing an oversized hashtable could reach the oversized allocation path in __kvmalloc_node_noprof(), triggering WARN_ON_ONCE because __GFP_NOWARN is unset. The upstream correction clamps the maximum conntrack hashtable size to INT_MAX.
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A Linux kernel netfilter conntrack vulnerability involving clamping the maximum hashtable size to INT_MAX, addressed in this Red Hat kernel security update.
Linux kernel Netfilter connection-tracking size validation flaw.
Linux kernel netfilter conntrack flaw in which an oversized conntrack hashtable resize could trigger WARN_ON_ONCE in __kvmalloc_node_noprof(). The fix clamps the maximum hashtable size to INT_MAX. Hashtable resize is only possible from init_netns.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.