SB2026040656 - Improper Initialization in Linux kernel tty serial driver
Published: April 6, 2026
Security Bulletin ID
SB2026040656
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Initialization (CVE-ID: CVE-2026-23472)
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper initialization handling in handle_tx() when processing PORT_UNKNOWN serial ports. A local user can use a PORT_UNKNOWN serial port to trigger an infinite loop and cause a denial of service.
This issue occurs because write-room reporting can indicate available space while write operations return zero when the transmit buffer is NULL, which can lead to a system hang.
Remediation
Install update from vendor's website.