CVE-2022-49689
Description
[REJECTED CVE] A vulnerability was identified in the Linux kernel’s xen-blkfront driver, where failing to fully initialize a virtual block device (VBD) before detaching it could lead to a NULL pointer dereference due to gendisk being NULL. An attacker with control over a guest VM could exploit this by attaching an invalid or non-existent backend device and then detaching it, triggering a kernel crash or denial of service in the host through a NULL dereference during cleanup in blkfront_closing().
Statement
This CVE has been rejected upstream: https://lore.kernel.org/linux-cve-announce/2025022602-REJECTED-aafa@gregkh/
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).
The following CVSS metrics and score provided are preliminary and subject to review.
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
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
