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CVE-2026-49419 is an integer underflow / reference count underflow vulnerability in the FreeBSD Jail subsystem. According to the FreeBSD advisory, when the JAIL_AT_DESC flag is specified, kern_jail_set() and kern_jail_get() release the reference to the caller's current prison before looking up the jail descriptor. If descriptor lookup fails, the error-handling path releases the same prison reference a second time. This double release causes a prison reference count underflow and can free a prison structure while it is still in use. The issue is reachable via jail_set and jail_get, including from a jail environment, by a jail administrator or jail-confined process.
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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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An underflow vulnerability in FreeBSD Jail handling that may permit privilege escalation from a jail context via jail_set/jail_get operations.
An integer underflow vulnerability in FreeBSD's Jail subsystem that may allow memory corruption or privilege-impacting behavior via jail_set/jail_get operations.
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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.