SB20261023153 - NULL pointer dereference in Linux kernel bluetooth rfcomm

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Main Vulnerability Database SB20261023153

SB20261023153 - NULL pointer dereference in Linux kernel bluetooth rfcomm

Published: October 23, 2026

Security Bulletin ID SB20261023153
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) NULL pointer dereference (CVE-ID: CVE-2026-99008)

CWE-ID: CWE-476 - NULL Pointer Dereference

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 crash.

The vulnerability exists due to a NULL pointer dereference in the Linux kernel Bluetooth RFCOMM function rfcomm_dev_shutdown() when closing a tty whose device registration failed. A local user can open /dev/rfcommN after the RFCOMM device becomes discoverable but before tty registration completes, then close it following a registration failure to trigger a dereference of the unset dev->tty_dev pointer and cause a kernel crash.


Remediation

Install update from vendor's website.

References