SB2026090564 - Race condition in Linux kernel tty serial driver

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Main Vulnerability Database SB2026090564

SB2026090564 - Race condition in Linux kernel tty serial driver

Published: September 5, 2026

Security Bulletin ID SB2026090564
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Race condition (CVE-ID: CVE-2026-80886)

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

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


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

The vulnerability exists due to a race condition in the MSM serial driver console UART when userspace writes to the TTY device concurrently with kernel console output. A local user can write to the TTY device while the kernel printk path reconfigures the UART controller to cause a denial of service.

The issue is most likely to occur during system startup or shutdown.


Remediation

Install update from vendor's website.

References