CVE-2026-72090: accel/amdxdna: Use caller client for debug BO sync

CVE-2026-72090: accel/amdxdna: Use caller client for debug BO sync

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

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

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

accel/amdxdna: Use caller client for debug BO sync

amdxdna_drm_sync_bo_ioctl() looks up args->handle in the ioctl caller's
drm_file. For SYNC_DIRECT_FROM_DEVICE, it then calls
amdxdna_hwctx_sync_debug_bo(), but passes abo->client.

amdxdna_hwctx_sync_debug_bo() uses the passed client both as the handle
namespace for debug_bo_hdl and as the owner of the hardware context xarray.
Those must match the file that supplied args->handle. The BO's stored
client pointer is object state, not the ioctl context.

Pass filp->driver_priv instead, matching the original handle lookup.

The Linux kernel CVE team has assigned CVE-2026-72090 to this issue.


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

	Issue introduced in 6.19 with commit 7ea0468380216c10b73633b976d33efa8c12d375 and fixed in 7.1.5 with commit 216e43d93dd49ec253052741aa476e51a8c54cd8
	Issue introduced in 6.19 with commit 7ea0468380216c10b73633b976d33efa8c12d375 and fixed in 7.2-rc1 with commit 7caf2a2351d4053075670ff3e26a6815da0a9e1e

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-2026-72090
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/accel/amdxdna/amdxdna_gem.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/216e43d93dd49ec253052741aa476e51a8c54cd8
	https://git.kernel.org/stable/c/7caf2a2351d4053075670ff3e26a6815da0a9e1e