CVE-2024-56677
Description
A flaw was found in the fadump (firmware-assisted dump) memory reservation logic in the PowerPC architecture of the Linux kernel. The fadump_cma_init() function was called too early during system initialization, before proper memory alignment parameters were established. As a result, reserved CMA memory could bypass alignment checks, leading to violations such as pageblock misalignment. This could trigger kernel panics or crashes later in the boot process, notably with VM_BUG_ON_PAGE assertions. A local attacker or misconfigured system could exploit this issue to cause a denial of service during system boot, affecting system availability.
Statement
The bug is specific for PowerPC platform and can happen during initialization (ex. during boot time). The security impact is limited, because bug detected by VM_BUG_ON_PAGE correctly.
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 | 4.7 | 5.5 | 7.8 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | High | Low | Low |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | None | High |
| Integrity Impact | None | None | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/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
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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