8.8

CVE-2026-49419

Jail reference count underflow

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Freebsd ≫ Freebsd Version 15.0 Update -
Freebsd ≫ Freebsd Version 15.0 Update p1
Freebsd ≫ Freebsd Version 15.0 Update p10
Freebsd ≫ Freebsd Version 15.0 Update p2
Freebsd ≫ Freebsd Version 15.0 Update p3
Freebsd ≫ Freebsd Version 15.0 Update p4
Freebsd ≫ Freebsd Version 15.0 Update p5
Freebsd ≫ Freebsd Version 15.0 Update p6
Freebsd ≫ Freebsd Version 15.0 Update p7
Freebsd ≫ Freebsd Version 15.0 Update p8
Freebsd ≫ Freebsd Version 15.0 Update p9
Freebsd ≫ Freebsd Version 15.1 Update -
Freebsd ≫ Freebsd Version 15.1 Update rc2
Freebsd ≫ Freebsd Version 15.1 Update rc3-p1
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.16% 0.054
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
CISA-ADP 8.8 2.8 5.9
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-911 Improper Update of Reference Count

The product uses a reference count to manage a resource, but it does not update or incorrectly updates the reference count.

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