CVE-2023-2235: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 5.13, before 5.15.104 (fixed in 5.15.104); from 5.16, before 6.1.21 (fixed in 6.1.21); from 6.2, before 6.2.8 (fixed in 6.2.8)

Published 2023-05-01. Last modified 2026-08-07.