CVE-2023-53848
Description
A deadlock vulnerability was found in the md RAID5 cache (r5l) subsystem in the Linux kernel. In r5l_exit_log(), flush_work() is called while holding reconfig_mutex, which waits for disable_writeback_work to complete. However, r5c_disable_writeback_async() calls wait_event() which requires conf->log to be NULL, but that only happens after flush_work() returns, creating a deadlock.
Statement
This is a deadlock vulnerability in the RAID5 journaling cache subsystem that can cause system hangs when stopping RAID5 arrays with caching enabled. The impact is limited to systems using RAID5 with write-back caching.
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 | 4.7 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | High | 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:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Other); DoS: Crash, Exit, or Restart
Each thread of execution will "hang" and prevent tasks from completing. In some cases, CPU consumption may occur if a lock check occurs in a tight loop.
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