The vulnerability of the group_is_primary() function in the FreeBSD operating system allows a hacker to increase their privileges.

The vulnerability of the groupisprimary function in the FreeBSD operating system’s kernel involves bypassing authentication by using an alternative path or channel. Exploiting this vulnerability allows a remote attacker to gain increased privileges...

CVE-2026-58092

In FreeBSD 15.0, the kernel structure used to represent user credentials changed: previously the primary group ID was stored in the first element of the array containing the list of supplementary group IDs, whereas now the primary group ID is stored in a dedicated field. This change was largely...

CVE-2026-58092

In FreeBSD 15.0 , a regression in the group_is_primary() function allows for unauthorized credential switching via the mac_do policy module. Due to a kernel structure change where the primary group ID was moved to a dedicated field, the function incorrectly retrieves the ID from the first element...

CVE-2026-58092: Authentication Bypass Using an Alternate Path or Channel

In FreeBSD 15.0, the kernel structure used to represent user credentials changed: previously the primary group ID was stored in the first element of the array containing the list of supplementary group IDs, whereas now the primary group ID is stored in a dedicated field. This change was largely...

FreeBSD : FreeBSD -- Unauthorized credential switching (55fbe7b1-a0fe-11f1-ae1f-bc241121aa0a)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 55fbe7b1-a0fe-11f1-ae1f-bc241121aa0a advisory. In FreeBSD 15.0, the kernel structure used to represent user credentials changed: previously the primar...

PT-2026-81930

In FreeBSD 15.0, the kernel structure used to represent user credentials changed: previously the primary group ID was stored in the first element of the array containing the list of supplementary group IDs, whereas now the primary group ID is stored in a dedicated field. This change was largely...

FreeBSD -- Unauthorized credential switching

Problem Description: In FreeBSD 15.0, the kernel structure used to represent user credentials changed: previously the primary group ID was stored in the first element of the array containing the list of supplementary group IDs, whereas now the primary group ID is stored in a dedicated field. This...

FreeBSD-SA-26:59.mac_do

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:59.macdo Security Advisory The FreeBSD Project Topic: Unauthorized credential switching Category: core Module: macdo Announced: 2026-08-25 Credits: Hazley...