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CVE-2026-31669 is a slab use-after-free in the Linux kernel MPTCP subsystem's lockless established-socket hash lookup path, manifesting in __inet_lookup_established. During initialization, mptcp_subflow_init() copied the IPv6 TCP protocol structure before IPv6 protocol registration had initialized its slab cache. Consequently, tcpv6_prot_override retained a null slab pointer and MPTCP IPv6 subflow child sockets were allocated from a general kmalloc cache rather than the TCPv6 cache protected by SLAB_TYPESAFE_BY_RCU. Because child sockets do not use SOCK_RCU_FREE, freed socket storage may be immediately reused while concurrent RCU-protected ehash lookups still reference it.
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No public exploit code observed for this vulnerability.
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29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel MPTCP slab use-after-free vulnerability in __inet_lookup_established.
A Linux kernel MPTCP slab use-after-free vulnerability in __inet_lookup_established.
Linux kernel MPTCP slab use-after-free vulnerability in __inet_lookup_established.
A Linux kernel MPTCP use-after-free vulnerability in __inet_lookup_established, fixed in this Red Hat kernel update.
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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.