UNKNOWN NVD

CVE-2026-49419

When the JAIL_AT_DESC flag is specified, kern_jail_set() and kern_jail_get() released the reference to the caller's current prison before looking up the jail de

When the JAIL_AT_DESC flag is specified, kern_jail_set() and kern_jail_get() released the reference to the caller's current prison before looking up the jail descriptor. If the descriptor lookup failed, error-handling paths released the same reference a second time. An unprivileged local user can trigger a prison reference count underflow, which may cause the prison structure to be freed while still in use. When this is done on the jail host, the bug will generally result in an immediate panic. However, if the user is running in a jail, then it may be possible to exploit the bug to elevate privileges.

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:38.jail.asc

Published: 2026-08-19 · Source: NVD · Feed updated: 2026-08-20

This unknown severity vulnerability was published on 2026-08-19 via NVD.

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