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CVE-2024-36889 is an uninitialized-variable flaw in the Linux kernel Multipath TCP (MPTCP) connection-establishment path. When a client socket falls back to TCP early during connection setup, MPTCP snd_nxt has not yet been initialized. An incoming acknowledgment can consequently propagate the uninitialized value to snd_una. If the MPTCP worker subsequently performs MPTCP-level data reinjection, it uses the corrupted snd_una value during send-buffer cleanup, triggering a kernel warning and inconsistent sequence-accounting state. The fix initializes snd_nxt and write_seq during connect.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel MPTCP flaw caused by improper initialization of snd_nxt during connection setup.
A Linux kernel MPTCP flaw caused by improper initialization of snd_nxt during connection establishment.
Linux kernel MPTCP vulnerability caused by improper initialization of snd_nxt during connection establishment.
Linux kernel Multipath TCP flaw caused by improper initialization of snd_nxt during connection setup. Red Hat includes a fix in its RHEL 8.6 kernel security 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.