CVE-2023-2235

The Linux kernel's Performance Events subsystem has a use-after-free flaw that occurs when a user triggers the perf_group_detach and remove_on_exec functions simultaneously. This flaw allows a local user to crash or potentially escalate their privileges on the system.

A use-after-free vulnerability in the Linux Kernel Performance Events system can be exploited to achieve local privilege escalation. The perf_group_detach function did not check the event's siblings' attach_state before calling add_event_to_groups(), but remove_on_exec made it possible to call list_del_event() on before detaching from their group, making it possible to use a dangling pointer causing a use-after-free vulnerability. We recommend upgrading past commit fd0815f632c24878e325821943edccc7fde947a2.

This update for the Linux Kernel 5.14.21-150500_53 fixes several issues. The following security issues were fixed. Fixed a vmwgfx Driver Double Free Local Privilege Escalation Vulnerability. Fixed an out-of-bounds write in the flower classifier code via TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets in fl_set_geneve_opt in net/sched/cls_flower.c. Fixed an use-after-free in the Performance Events system can be exploited to achieve local privilege escalation. Fixed a flaw that allowed an attacker to unauthorized execution of management commands, compromising the confidentiality, integrity, and availability of Bluetooth communication.