CVE-2026-68188
Description
A flaw was found in the Linux kernel's Bluetooth RFCOMM subsystem. A race condition in the rfcomm_tty_set_termios() function allows a session to be freed while it is still actively in use. This use-after-free (UAF) vulnerability can be exploited by a local attacker. Successful exploitation leads to a system crash, resulting in a Denial of Service (DoS).
Mitigation
To prevent the `rfcomm` kernel module from loading, create a modprobe configuration file. Add the following lines to `/etc/modprobe.d/disable-rfcomm.conf`:
install rfcomm /bin/trueAfter saving the file, regenerate the initramfs and reboot the system for the changes to take effect. This action will disable Bluetooth RFCOMM functionality. If the module is currently loaded, unload it with `rmmod rfcomm`; however, a system reboot is recommended to ensure the module is not loaded.
blacklist rfcomm
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.1 | N/A | N/A |
| Attack Vector | Adjacent Network | N/A | N/A |
| Attack Complexity | High | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | High | N/A | N/A |
| Integrity Impact | High | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Modify Application Data; Modify Memory; DoS: Crash, Exit, or Restart; Execute Unauthorized Code or Commands
It may be possible to cause data corruption and possibly execute arbitrary code by modifying global variables or data structures at unexpected times, violating the assumptions of code that uses this global data.
Access Control
Technical Impact: Gain Privileges or Assume Identity
If a signal handler interrupts code that is executing with privileges, it may be possible that the signal handler will also be executed with elevated privileges, possibly making subsequent exploits more severe.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
