CVE-2026-68258: drm/amdkfd: Check bounds on CRIU restore queue type and mqd size

From: Greg Kroah-Hartman <[email protected]>

Description
===========

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

drm/amdkfd: Check bounds on CRIU restore queue type and mqd size

We weren't checking whether the values provided in the private
data in kfd CRIU restore were within bounds.

For queue type, add a KFD_QUEUE_TYPE_MAX and ensure the provided
type is less than it.

For mqd_size, add new function mqd_size_from_queue_type and confirm
that the provided mqd_size matches expectations.

(cherry picked from commit f19d8086f6644083c913d70bfdeee20e1b6f46a5)

The Linux kernel CVE team has assigned CVE-2026-68258 to this issue.


Affected and fixed versions
===========================

	Fixed in 6.18.42 with commit fd1691ec62701c982ea32e749678988c67fd4c21
	Fixed in 7.1.6 with commit cc10a5839756982504ee8568fc1e1625962ab7f8
	Fixed in 7.2-rc3 with commit 47ea05f246bebc81c7796f56265cffd812cf0601

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-68258
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
	drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h
	drivers/gpu/drm/amd/amdkfd/kfd_priv.h
	drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/fd1691ec62701c982ea32e749678988c67fd4c21
	https://git.kernel.org/stable/c/cc10a5839756982504ee8568fc1e1625962ab7f8
	https://git.kernel.org/stable/c/47ea05f246bebc81c7796f56265cffd812cf0601