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CVE-2026-43116 is a Linux kernel vulnerability in the netfilter ctnetlink expectation-handling paths caused by unsafe access to the master conntrack object referenced through exp->master. The flaw arises because holding a reference to an expectation object does not guarantee that the associated master conntrack object remains valid. As a result, the master conntrack can be freed concurrently, leaving exp->master dangling and creating a race condition that can lead to invalid memory access or use-after-free behavior. The issue affects ctnetlink operations involved in adding, deleting, and retrieving expectations, as well as expectation event delivery. The fix extends protection with nf_conntrack_expect_lock around expectation lookup and relevant event-handling paths, including delivery of IPEXP_NEW, to serialize access with conntrack cleanup paths such as clean_from_lists() and prevent the master conntrack from disappearing while it is being accessed.
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No public exploit code observed for this vulnerability.
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22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel netfilter/ctnetlink vulnerability involving unsafe access to master conntrack.
A Linux kernel netfilter ctnetlink vulnerability involving unsafe access to master conntrack.
A Linux kernel netfilter ctnetlink vulnerability involving unsafe access to master conntrack.
A Linux kernel vulnerability in netfilter ctnetlink involving unsafe access to master conntrack state.
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.