CVE-2022-50820
Unknown Unknown - Not Provided
Hotplug Callback Leak in Linux perf/arm_dmc620 Kernel Module

Publication date: 2025-12-30

Last updated on: 2025-12-30

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: perf/arm_dmc620: Fix hotplug callback leak in dmc620_pmu_init() dmc620_pmu_init() won't remove the callback added by cpuhp_setup_state_multi() when platform_driver_register() failed. Remove the callback by cpuhp_remove_multi_state() in fail path. Similar to the handling of arm_ccn_init() in commit 26242b330093 ("bus: arm-ccn: Prevent hotplug callback leak")
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2025-12-30
Last Modified
2025-12-30
Generated
2026-05-07
AI Q&A
2025-12-30
EPSS Evaluated
2026-05-05
NVD
CVE-2022-50820
EUVD
EUVD-2022-55878
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a flaw in the Linux kernel's perf subsystem for the arm_dmc620 platform. Specifically, the function dmc620_pmu_init() fails to remove a hotplug callback added by cpuhp_setup_state_multi() if platform_driver_register() fails, leading to a callback leak. The fix involves removing the callback in the failure path using cpuhp_remove_multi_state(), similar to a previous fix in arm_ccn_init().


How can this vulnerability impact me? :

The impact of this vulnerability is a resource leak in the Linux kernel related to hotplug callbacks. While the exact consequences are not detailed, such leaks can potentially lead to system instability or unexpected behavior during CPU hotplug events on affected platforms.


Ask Our AI Assistant
Need more information? Ask your question to get an AI reply (Powered by our expertise)
0/70
EPSS Chart