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CVE-2026-46120 is a use-after-free vulnerability in the Linux kernel's IPv6 GRE/ERSPAN implementation. After an ERSPAN device is migrated between network namespaces using IFLA_NET_NS_FD, ip6erspan_changelink() uses dev_net(dev) rather than the tunnel's cached creation namespace, t->net. This reinserts the tunnel into the wrong per-network-namespace hash and leaves a stale entry in the original namespace. Destruction of that namespace causes ip6gre_exit_rtnl_net() to traverse the stale entry, triggering a slab use-after-free and a subsequent kernel BUG in unregister_netdevice_many_notify(). The vulnerable path is reachable from an unprivileged user namespace.
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41 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in the Linux kernel's ip6_gre component addressed by using the cached network reference t->net in ip6erspan_changelink(). Red Hat Enterprise Linux 9 kernel-rt packages are affected; the content does not specify the underlying exploitation mechanism or impact.
Listed in a Red Hat kernel-package security advisory; the specific flaw and its impact are not described.
A Linux kernel IPv6 GRE vulnerability addressed by using the cached t->net value in ip6erspan_changelink(). The content does not specify its impact.
A vulnerability covered by the Miracle Linux kernel package update. Individual technical details and exploit availability are not specified.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.