CVE-2026-74676
Received Received - Intake

Permission Check Bypass in Linux Kernel VT

Publication date: 2026-08-22

Last updated on: 2026-08-22

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: vt: add permission check for KDSKBMETA ioctl KDSKBMETA modifies keyboard meta mode but lacks the !perm check that all other keyboard setter ioctls in vt_k_ioctl() enforce, allowing a process to change meta mode on a non-controlling console without authorization.

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Meta Information

Published
2026-08-22
Last Modified
2026-08-22
Generated
2026-08-22
AI Q&A
2026-08-22
EPSS Evaluated
N/A
NVD
CVE-2026-74676
EUVD
EUVD-2026-64363

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a missing permission check for the KDSKBMETA ioctl in the virtual terminal (vt) subsystem. The KDSKBMETA ioctl allows changing keyboard meta mode, but unlike other keyboard-related ioctls, it does not verify if the process has the necessary permissions to perform this action. This could let an unauthorized process modify the meta mode on a non-controlling console.

Impact Analysis

This vulnerability could allow an attacker with local access to change keyboard meta mode on a system without proper authorization. This might lead to unexpected keyboard behavior or potential misuse of input controls, though the practical impact depends on the system configuration and usage.

Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve the missing permission check in the vt_k_ioctl function for KDSKBMETA ioctl.

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