CVE-2024-56678
Description
A flaw was found in the PowerPC architecture's memory fault handling in the Linux kernel. When reading from /proc/kcore, the kernel may incorrectly attempt to handle faults on KFENCE-allocated memory regions using the KFENCE mechanism instead of the appropriate fixup table. This misbehavior can lead to false-positive reports of memory errors, including invalid reads and use-after-free conditions. A local attacker could exploit this by triggering reads on unmapped or freed KFENCE objects, potentially causing a denial of service or confusing kernel debugging tools.
Statement
Only privileged local user can trigger this bug, so the security impact is limited.
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 | 6.7 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | High | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | High | N/A | N/A |
| Integrity Impact | High | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
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