SB20260824100 - Improper access control in Linux kernel tty vt driver
Published: August 24, 2026
Security Bulletin ID
SB20260824100
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2026-74676)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to modify keyboard meta mode on a non-controlling console without authorization.
The vulnerability exists due to improper access control in the KDSKBMETA ioctl handler in vt_k_ioctl() when processing KDSKBMETA ioctl requests. A local user can invoke the KDSKBMETA ioctl to modify keyboard meta mode on a non-controlling console without authorization.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1c5b67a1e2cb7d78dab321280f330b056e3bf437
- https://git.kernel.org/stable/c/4671c3b79e337bbae28c2d79023dc642df012bde
- https://git.kernel.org/stable/c/7bf32337a7103ccb686cbd240324bf26225ef2d6
- https://git.kernel.org/stable/c/9f8cbaf4b774694dcc292e60509762483ebfd9ae
- https://git.kernel.org/stable/c/a1c31e026c93e378e297a8df8328983d3013a59f
- https://git.kernel.org/stable/c/a7ad0034453ba4c353f9b8f810ee2569de33d283
- https://git.kernel.org/stable/c/d8ead5083b203d12b8319e7cb29cc6b8836e813f
- https://git.kernel.org/stable/c/ddc4a8303347114e945b9e6e81b81d77855f7358