Use After Free Affecting kernel-core package, versions <0:5.14.0-284.18.1.el9_2
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Test your applications- Snyk ID SNYK-RHEL9-KERNELCORE-5732520
- published 2 May 2023
- disclosed 15 Mar 2023
Introduced: 15 Mar 2023
CVE-2023-2235 Open this link in a new tabHow to fix?
Upgrade RHEL:9 kernel-core to version 0:5.14.0-284.18.1.el9_2 or higher.
This issue was patched in RHSA-2023:3723.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-core package and not the kernel-core package as distributed by RHEL.
See How to fix? for RHEL:9 relevant fixed versions and status.
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.