CVE-2026-64546
Description
A flaw was found in the Linux kernel. A specially crafted Extended Display Identification Data (EDID), which describes display capabilities, can cause a heap out-of-bounds read in the drm_parse_tiled_block() function within the drm/edid component. This vulnerability could lead to system instability or the disclosure of sensitive information.
Statement
This vulnerability is rated as Moderate severity because successful exploitation requires either local user privileges or physical access to attach a peripheral monitor presenting malformed display configuration data, limiting the threat to a local denial of service or potential kernel memory disclosure. In standard Red Hat Enterprise Linux server environments, systems typically operate headless without dynamically attached monitors, significantly narrowing real-world exposure. However, virtualized guest instances or desktop workstations where users or emulated devices can supply custom video descriptors may still trigger the condition, potentially crashing the host or guest kernel.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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 | 7.1 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: 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:N/A:H
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