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CVE-2026-43198 is a race condition in the Linux kernel TCP stack affecting IPv6 SYN receive processing. In the affected path, tcp_v6_syn_recv_sock() performed IPv6-specific child-socket initialization only after calling tcp_v4_syn_recv_sock(). The latter had already inserted the child socket into the TCP established-hash table, making it accessible to other CPUs while the child socket's IPv6 state could still reference the listening socket's IPv6 protocol information. The fix moves the initialization into tcp_v6_mapped_child_init(), called by tcp_v4_syn_recv_sock() before hash-table insertion, ensuring the child socket is fully initialized before it becomes concurrently visible.
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31 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel TCP vulnerability involving a potential race condition in tcp_v6_syn_recv_sock().
A Linux kernel TCP vulnerability involving a potential race in tcp_v6_syn_recv_sock().
A Linux kernel TCP vulnerability involving a potential race condition in tcp_v6_syn_recv_sock().
A Linux kernel TCP vulnerability involving a potential race condition in tcp_v6_syn_recv_sock().
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.