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CVE-2026-49416 is a local kernel vulnerability in the FreeBSD vt(4) console subsystem's CONS_HISTORY ioctl handler. The handler did not adequately validate the requested history size. Supplying a sufficiently large history size causes an integer overflow during buffer size calculation, leading to a heap allocation that is smaller than intended. Subsequent initialization of the history buffer then writes past the end of the allocated heap region, resulting in a kernel heap out-of-bounds write. The issue is reachable by an unprivileged local user who has access to a vt(4) device.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An information disclosure vulnerability in FreeBSD's vt console subsystem via the CONS_HISTORY ioctl.
An information disclosure vulnerability in FreeBSD's vt console subsystem that can expose kernel memory through the CONS_HISTORY ioctl.
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.