CVE-2025-38665

In the Linux kernel, the following vulnerability has been resolved: can: netlink: can_changelink(): fix NULL pointer deref of struct can_priv::do_set_mode Andrei Lalaev reported a NULL pointer deref when a CAN device is restarted from Bus Off and the driver does not implement the struct can_priv::do_set_mode callback. There are 2 code path that call struct can_priv::do_set_mode: - directly by a manual restart from the user space, via can_changelink() - delayed automatic restart after bus off (deactivated by default) To prevent the NULL pointer deference, refuse a manual restart or configure the automatic restart delay in can_changelink() and report the error via extack to user space. As an additional safety measure let can_restart() return an error if can_priv::do_set_mode is not set instead of dereferencing it unchecked.

• linux linux kernel (>= 2.6.31 < 6.1.148) • linux linux kernel (>= 6.2 < 6.6.101) • linux linux kernel (>= 6.7 < 6.12.41) • linux linux kernel (>= 6.13 < 6.15.9) • linux linux kernel 6.16 • debian debian linux 11.0