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CVE-2026-49412 is a kernel use-after-free vulnerability in FreeBSD's IPv6 multicast subsystem, specifically in the IPV6_MSFILTER socket option handler. The handler drops a serializing lock while copying the source-filter list from userspace and then reacquires it. During that unlocked window, a concurrent thread can free the multicast filter structure, leaving the handler with a stale pointer to freed memory when execution resumes. This creates a race condition that can be triggered by a local unprivileged user and may result in reuse of freed kernel memory in a privileged context.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A FreeBSD kernel use-after-free vulnerability involving IPV6_MSFILTER processing.
A use-after-free vulnerability in FreeBSD kernel IPv6 multicast filter handling involving IPV6_MSFILTER.
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.