SB20260727156 - NULL pointer dereference in Linux kernel bluetooth
Published: July 27, 2026
Security Bulletin ID
SB20260727156
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-64404)
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.
The vulnerability exists due to a NULL pointer dereference in iso_conn_big_sync() when handling recvmsg on a PA-sync broadcast sink socket during connection teardown. A local user can trigger a race condition to cause a denial of service.
The issue is reachable from iso_sock_recvmsg() for a PA-sync broadcast sink socket with BT_SK_DEFER_SETUP and BT_SK_PA_SYNC set.
Remediation
Install update from vendor's website.