Use-after-free in Linux kernel - CVE-2026-64433
Published: July 27, 2026
Vulnerability identifier: #VU139512
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64433
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in add_device_complete in net/bluetooth/mgmt.c when handling concurrent bluetooth management device add and remove operations. A local user can trigger concurrent MGMT requests to access freed memory and cause a denial of service.
The issue occurs because hci_conn_params_lookup() is used without holding the required device lock while the returned object is later dereferenced.
Affected software
Linux kernel
How to mitigate CVE-2026-64433
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/9531014c60c804e16099885d4a98aedcf31bce8d
- https://git.kernel.org/stable/c/b346efa825b5e4386f19bc63f81141652d496ec4
- https://git.kernel.org/stable/c/caed4a96d55757c139a899744657c032b6186665
- https://git.kernel.org/stable/c/e4369e4e970f3fa4676b76be14c1d315c87f22b6
- https://git.kernel.org/stable/c/fa85d985f614bc3feb343000f14a1072e99b0df1