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CVE-2026-43116 is a Linux kernel netfilter vulnerability in the ctnetlink expectation-handling paths caused by unsafe access to the master conntrack object via exp->master. The expectation object reference alone is insufficient to guarantee that the associated master conntrack remains valid; the master conntrack can be freed concurrently, leaving exp->master dangling. The fix extends use of nf_conntrack_expect_lock to serialize access with conntrack cleanup paths such as clean_from_lists(), and adjusts add/get/delete expectation handling and expectation event delivery so exp->master is only accessed while properly protected. The flaw is therefore a kernel race condition leading to stale pointer dereference/use-after-free in conntrack expectation processing.
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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.
6 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.