SB20261022344 - Use-after-free in Linux kernel bluetooth

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Main Vulnerability Database SB20261022344

SB20261022344 - Use-after-free in Linux kernel bluetooth

Published: October 22, 2026

Security Bulletin ID SB20261022344
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) Use-after-free (CVE-ID: CVE-2026-98737)

CWE-ID: CWE-416 - Use After Free

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 potentially cause a denial of service by triggering access to freed Bluetooth inquiry-cache entries.

The vulnerability exists due to use-after-free in the Linux kernel Bluetooth inquiry-cache handling in hci_acl_create_conn_sync() and hci_stop_discovery_sync() when preparing connection or discovery-cancellation commands concurrently with cache updates or flushes. A local user can trigger an HCIINQUIRY ioctl concurrently with these operations to free a cache entry after lookup but before the worker reads its fields, potentially causing a kernel crash.


Remediation

Install update from vendor's website.

References