SB20261022359 - Race condition in Linux kernel drivers/tty/tty_io.c: send_break()

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20261022359

SB20261022359 - Race condition in Linux kernel drivers/tty/tty_io.c: send_break()

Published: October 22, 2026

Security Bulletin ID SB20261022359
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-2026-98751)

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 trigger driver calls for an unavailable tty device, potentially causing a denial of service.

The vulnerability exists due to a race condition in the Linux kernel tty subsystem's send_break() function when processing timed break ioctls concurrently with a hangup. A local user can issue TCSBRK or TCSBRKP ioctls with a user-controlled timeout to trigger a delayed break_ctl() callback after the device has disappeared or powered down, potentially disrupting system operation if the driver does not safely handle the race.


Remediation

Install update from vendor's website.

References