CVE-2022-50771
Description
A lockdep warning was found in the Linux kernel's RCU subsystem. The rcu_force_quiescent_state() function incorrectly uses __this_cpu_read() in preemptible code context. This macro requires preemption to be disabled, but the code can be called from preemptible context during rcutorture testing, triggering a lockdep warning.
Statement
This is a lockdep/debugging warning that occurs when running rcutorture with specific parameters on preemptible kernels. The warning indicates improper use of per-CPU access macros but does not cause a crash or security vulnerability in normal operation. The fix simply changes to the appropriate raw_cpu_read() macro.
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 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Integrity,Confidentiality,Other
Technical Impact: Modify Application Data; Read Application Data; Alter Execution Logic
Frequently Asked Questions
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