SB20260816186 - Use-after-free in Linux kernel bluetooth

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-74533)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service or execute arbitrary code.

The vulnerability exists due to a use-after-free race condition in the Bluetooth ISO connection handling in net/bluetooth/iso.c when processing Bluetooth ISO data and connection teardown. A local user can trigger concurrent access to hci_conn->iso_data to cause a denial of service or execute arbitrary code.

The issue involves unsynchronized access to hci_conn->iso_data during iso_recv(), iso_conn_put(), iso_conn_add(), and iso_conn_free().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/876a3e94c70d0859d1dad1c986112d4f0d99eba8
• https://git.kernel.org/stable/c/af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9c