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CVE-2024-36889 is an initialization flaw in the Linux kernel Multipath TCP (MPTCP) implementation. During early fallback from MPTCP to TCP on a client socket, the MPTCP snd_nxt sequence value may not yet be initialized. A received acknowledgment can then propagate this invalid 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-state handling. The fix initializes snd_nxt, and write_seq for consistency, when the connection is established.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
11 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.