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CVE-2026-49422 is a use-after-free vulnerability in FreeBSD's TCP RACK implementation, specifically in the RACK setsockopt(2) handler in the tcp_rack kernel module. The flaw arises because the handler drops the connection lock while copying option data from userspace and later reacquires it. After reacquiring the lock, the code verifies that the TCP stack had not been switched away, but fails to reload the pointer to the stack's per-connection control block. If a local user causes the TCP stack to be switched twice during that window, the validation succeeds while the saved pointer still references freed memory. Subsequent use of that stale pointer can lead to kernel memory corruption, system instability, or privilege-impacting behavior.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A FreeBSD TCP/RACK use-after-free vulnerability in the setsockopt(2) handler that may allow an unprivileged local user to escalate privileges.
A use-after-free vulnerability in FreeBSD's tcp_rack.ko TCP RACK implementation that can lead to denial of service and potentially privilege escalation.
A use-after-free vulnerability in FreeBSD's tcp_rack.ko module affecting the TCP RACK implementation.
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.