SB20261022456 - Out-of-bounds read in Linux kernel tty vt driver

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Main Vulnerability Database SB20261022456

SB20261022456 - Out-of-bounds read in Linux kernel tty vt driver

Published: October 22, 2026

Security Bulletin ID SB20261022456
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-98838)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to trigger an out-of-bounds kernel memory read, potentially causing a denial of service.

The vulnerability exists due to an out-of-bounds read in the Linux kernel virtual terminal and framebuffer console rendering path when processing a DEC alignment test on a background console with a changed font size. A local privileged user can configure different font sizes on visible and background consoles, enable framebuffer rotation, and write the ESC # 8 sequence to the background console to trigger rendering against a backing buffer that was not resized, potentially causing a kernel crash.


Remediation

Install update from vendor's website.

References