CVE-2022-50510
Description
A resource-handling flaw was found in the Linux kernel performance monitoring driver for ARM System Memory Management Unit version 3 in the way hotplug callbacks are registered during driver initialization. If driver registration fails, previously added CPU hotplug callbacks are not removed, leaving leaked callbacks behind. A local user could use this flaw to destabilize the system, resulting in a denial of service.
Statement
arm_smmu_pmu_init() added multi-CPU hotplug callbacks but did not remove them on a subsequent platform driver registration failure. The correction removes the registered callbacks in the failure path so that no dangling hotplug handlers remain after an init error.
Mitigation
To mitigate this issue, prevent module arm_smmuv3_pmu from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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