CVE-2026-98205
Description
A flaw was found in the Linux kernel's event device (evdev) subsystem. When processing device configuration requests with a smaller-than-expected data size, the kernel fails to initialize a temporary memory structure on the stack before copying user data into it. A local user can exploit this vulnerability to read uninitialized kernel stack data back into user space, resulting in information disclosure of sensitive system memory.
Statement
This vulnerability is rated as Moderate impact because triggering the flaw requires local access with read and write permissions to an input event device, restricting the attack surface. In default Red Hat Enterprise Linux configurations, access to event nodes under /dev/input is confined to privileged accounts, the input group, or active console sessions. Furthermore, while the flaw permits reading uninitialized stack memory, it cannot be leveraged directly for arbitrary code execution or modifying kernel state.
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 | 7 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | High | 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 | 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:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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