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CVE-2021-47304 is a resource-leak flaw in the Linux kernel TCP subsystem. During connection establishment, tcp_init_transfer() could clear the icsk_ca_initialized state even when congestion control had already been initialized. This permits tcp_init_congestion_control() to invoke a congestion-control module's init callback a second time without an intervening release callback. Congestion-control implementations that allocate state during initialization, including CDG, can leak that state; other module-specific effects are possible.
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No public exploit code observed for this vulnerability.
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4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A low-severity Linux kernel TCP vulnerability involving tcp_init_transfer() incorrectly resetting icsk_ca_initialized. The issue was resolved by preventing that reset.
A Linux kernel TCP congestion-control initialization flaw that can cause double initialization and memory leaks when a local low-privileged process changes TCP congestion control during a TCP Fast Open connection attempt. Red Hat rates it Low severity (CVSS 5.5) with high availability impact.
A Linux kernel TCP congestion-control initialization flaw. A sequence involving TCP Fast Open/connect, changing TCP_CONGESTION while the socket is in TCP_SYN_SENT, and receiving an ACK can cause double initialization of a congestion-control module without release, potentially leaking memory.
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.