CVE-2026-64529

Summary

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_devmgr_get_num_dev(), adf_devmgr_get_dev_by_id(), adf_get_vf_real_id() and the unused ADF_CFG macros.

Additionally, drop the entry associated to QAT IOCTLs in ioctl-number.rst.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/071590a44cbc38483fceb1ab943363ec26868e1b
• https://git.kernel.org/stable/c/1de076f43e64bf65fbe7280a269c70e0e60518df
• https://git.kernel.org/stable/c/a4999664a5ef77bdb0c6e6b935f581ac8ce6b63a
• https://git.kernel.org/stable/c/6848a6e39cac44fdb7cb88f0f777df62172d1551
• https://git.kernel.org/stable/c/b1ea97076bd0a5196290deba172034e480646727
• https://git.kernel.org/stable/c/b8ebf008696de1ec08c90d51f94d7e40bd448be1
• https://git.kernel.org/stable/c/de2cc38489b629927910b1aeff69bba7bd5c6f1b
• https://git.kernel.org/stable/c/3ae49dd04dbb11fb73f17f58a982dba128abe83a
• https://git.kernel.org/stable/c/d237230728c567297f2f98b425d63156ab2ed17f

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