CVE-2023-53620
Description
A logic flaw was found in the Linux kernel Multiple Device (software RAID) status reporting, where concurrent updates to resynchronization progress can overflow an internal difference calculation. This can cause the progress bar routine to loop excessively and trigger a soft lockup.
A local user could use this flaw to hang the system during array resynchronization, resulting in a denial of service.
Statement
status_resync() computes a difference between two fields that can change concurrently. If the subtraction wraps to a very large value, the code spends unbounded time emitting progress characters. The fix detects the inconsistent state and reports an “active” status without iterating, avoiding the long loop.
Mitigation
To mitigate this issue, prevent module md_mod 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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