SB20261022361 - Race condition in Linux kernel tty driver

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Main Vulnerability Database SB20261022361

SB20261022361 - Race condition in Linux kernel tty driver

Published: October 22, 2026

Security Bulletin ID SB20261022361
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) Race condition (CVE-ID: CVE-2026-98753)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 by triggering a kernel panic.

The vulnerability exists due to improper error-state handling in tty_port_open() in drivers/tty/tty_port.c when port activation fails and a TTY ioctl races with hangup and open operations. A local user can trigger this race to cause I/O attempts on a powered-down or deregistered port, leading to a kernel panic through unclocked accesses or NULL-pointer dereferences.


Remediation

Install update from vendor's website.

References