SB2026062666 - Use-after-free in Linux kernel bluetooth rfcomm

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Main Vulnerability Database SB2026062666

SB2026062666 - Use-after-free in Linux kernel bluetooth rfcomm

Published: June 26, 2026

Security Bulletin ID SB2026062666
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-53256)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a use-after-free in rfcomm_connect_ind() and rfcomm_get_sock_by_channel() when handling RFCOMM connection indications for a listener socket during a concurrent close. A remote attacker can trigger a race condition to cause a denial of service.

The issue occurs in the Linux kernel Bluetooth RFCOMM socket handling path when a listener socket is closed while a child socket is being queued, and KASAN reported the resulting slab-use-after-free in lock_sock_nested().


Remediation

Install update from vendor's website.

References