CVE-2026-64529

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

crypto: qat - remove unused character device and IOCTLs

The QAT driver exposes a character device (qat_adf_ctl) with IOCTLs

for device configuration, start, stop, status query and enumeration.

These IOCTLs are not part of any public uAPI header and have no known

in-tree or out-of-tree users. Device lifecycle is already managed via

sysfs.

The ioctl interface also increases the attack surface and is the

subject of a number of bug reports.

Remove the character device, the IOCTL definitions, and the related

data structures (adf_dev_status_info, adf_user_cfg_key_val,

adf_user_cfg_section, adf_user_cfg_ctl_data). Drop the now-unused

adf_cfg_user.h header and strip adf_ctl_drv.c down to the minimal

module_init/module_exit hooks for workqueue, AER, and crypto/compression

algorithm registration.

Clean up leftover dead code that was only reachable from the removed

IOCTL paths: adf_cfg_del_all(), adf_devmgr_verify_id(),

adf_

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References