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CVE-2026-49422 is a use-after-free vulnerability in FreeBSD's tcp_rack.ko kernel module, which implements the TCP RACK stack. The issue is described in FreeBSD advisory freebsd_sa_26:43tcp as affecting the TCP RACK stack option handler. The flaw can result in dereferencing freed kernel memory during TCP RACK processing, creating a kernel memory-safety condition in the networking stack.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
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, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.