SB2026072155 - NULL pointer dereference in Linux kernel tty vt driver

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Main Vulnerability Database SB2026072155

SB2026072155 - NULL pointer dereference in Linux kernel tty vt driver

Published: July 21, 2026

Security Bulletin ID SB2026072155
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) NULL pointer dereference (CVE-ID: CVE-2026-53385)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a null pointer dereference caused by a race condition in vcs_notifier() in drivers/tty/vt/vc_screen.c when handling concurrent vcs_write operations. A local user can trigger concurrent write activity to cause a denial of service.

The issue occurs after the console lock is temporarily dropped and re-acquired, allowing the vc_data pointer to become stale before notifier processing.


Remediation

Install update from vendor's website.

References