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CVE-2026-49419 is a FreeBSD Jail subsystem vulnerability caused by incorrect reference-count handling in kern_jail_set() and kern_jail_get() when the JAIL_AT_DESC flag is used. The code releases the reference to the caller's current prison before attempting jail descriptor lookup; if that lookup fails, the error-handling path releases the same reference a second time. This double release causes a prison reference count underflow and can result in the prison structure being freed while still in active use, creating a kernel memory-safety condition consistent with a use-after-free scenario. The flaw is reachable through jail_set and jail_get operations and can be triggered by an unprivileged local user.
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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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Cross-references every affected SKU, including bundled OEM variants.
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