CVE-2026-68270
Description
A flaw was found in the Linux kernel's drm/sysfb component. This flaw occurs when calculating the visible size of the system framebuffer. The calculation uses 32-bit arithmetic, which can overflow if the values for height and stride are excessively large. This overflow leads to truncation of the result, potentially causing incorrect size calculations that could result in system instability or a denial of service (DoS).
Statement
This issue affects system framebuffer (drm/sysfb). Visible size calculation can truncate on 32-bit overflow with large height/stride. Systems using drm/sysfb with very large framebuffers.
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
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