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CVE-2025-68768 is a Linux kernel availability vulnerability in the inet fragmentation/defragmentation path during network namespace teardown. Pending SKBs can remain in fragment queues while still holding conntrack references. Because conntrack depends on nf_defrag_ipv6, nf_defrag_ipv6 may load first and therefore its network-namespace exit hooks run after conntrack's exit hook. In this ordering, conntrack cleanup can loop indefinitely in nf_conntrack_cleanup_net_list() while fragment-queue SKBs still retain references, leading to deadlock conditions involving pernet_ops_rwsem. The upstream fix flushes all fragment queue SKBs in fqdir_pre_exit() so conntrack references are released before conntrack cleanup runs, and also flushes queues from timer expiry handlers when fqdir->dead is set to handle races where packets arrive during pre-exit cleanup.
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No public exploit code observed for this vulnerability.
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4 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.