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CVE-2024-36489 is a race condition in the Linux kernel TLS subsystem caused by a missing write memory barrier during TLS context initialization. tls_init initializes the TLS context's saved protocol pointer from the socket protocol and then updates the socket's protocol pointer to the TLS protocol handlers. Without release ordering, the publication of the TLS protocol handlers can become visible before initialization of the context protocol pointer. A concurrent setsockopt or getsockopt operation can then invoke the TLS handler and dereference the still-NULL context protocol pointer. The fix publishes the socket protocol pointer with rcu_assign_pointer() only after the context protocol pointer has been initialized, providing release-barrier semantics.
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Missing memory barrier in Linux kernel TLS initialization.
Linux kernel TLS subsystem flaw caused by a missing memory barrier during initialization.
Linux kernel TLS initialization flaw caused by a missing memory barrier.
Linux kernel TLS implementation flaw caused by a missing memory barrier in tls_init.
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.