CVE-2022-50820 perf/arm_dmc620: Fix hotplug callback leak in dmc620_pmu_init()
A resource leak in the Linux kernel DMC620 PMU driver allows local attackers to cause denial of service by exhausting system resources.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-50820?
CVE-2022-50820 is a denial of service vulnerability in Linux, published on 30 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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")
Which versions are affected by CVE-2022-50820?
How do I fix CVE-2022-50820?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-50820 being exploited?
There is no known exploitation of CVE-2022-50820 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50820, GHSA-ww88-vgr6-ghr7, UBUNTU-CVE-2022-50820.