High · published May 1, 2023
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.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 5.13, < 5.15.104 | 5.15.104 |
| linux/linux_kernel | ≥ 5.16, < 6.1.21 | 6.1.21 |
| linux/linux_kernel | ≥ 6.2, < 6.2.8 | 6.2.8 |