SB20260727106 - Use-after-free in Linux kernel 6lowpan

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Main Vulnerability Database SB20260727106

SB20260727106 - Use-after-free in Linux kernel 6lowpan

Published: July 27, 2026

Security Bulletin ID SB20260727106
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-2026-64452)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to a use-after-free in lowpan_nhc_do_uncompression() when processing a malformed 6LoWPAN packet on an error path. A remote attacker can send a specially crafted packet to cause a denial of service.

The issue is caused by a race condition involving descriptor unregistration and access to nhc->name outside the protection of lowpan_nhc_lock, and it can be reached through the Bluetooth 6LoWPAN L2CAP receive path.


Remediation

Install update from vendor's website.

References