SB20261022355 - NULL pointer dereference in Linux kernel tty serial driver
Published: October 22, 2026
Security Bulletin ID
SB20261022355
CSH 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 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-98747)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service through a kernel crash.
The vulnerability exists due to a null pointer dereference in serial_core_unregister_port() when unregistering a serial port whose port device is absent. A local privileged user can trigger the affected unregistration path after port teardown or an early registration failure to cause a kernel crash and denial of service.
Remediation
Install update from vendor's website.