CVE-2026-80747: drm/amdkfd: Add bounds check for CRAT subtype length

CVE-2026-80747: drm/amdkfd: Add bounds check for CRAT subtype length

[Greg Kroah-Hartman]

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

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

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

drm/amdkfd: Add bounds check for CRAT subtype length

The CRAT parser validates that the subtype header fits within the image,
but does not verify that the advertised subtype length fits. A malformed
CRAT table with an oversized length field causes out-of-bounds reads when
kfd_parse_subtype() casts the header to specific subtype structures.

Add validation that sub_type_hdr + length does not exceed the image
boundary before parsing the subtype contents.

(cherry picked from commit 48e1d1e6e8798aef0312e68d8e586021b5b3cf4d)

The Linux kernel CVE team has assigned CVE-2026-80747 to this issue.


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

	Fixed in 7.1.10 with commit ca91e0cc8087568e4b791648a7c01e804f48cb73
	Fixed in 7.2 with commit 6e7566ba4739dd573c331adde1c96690f7a567bd

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-2026-80747
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_crat.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/ca91e0cc8087568e4b791648a7c01e804f48cb73
	https://git.kernel.org/stable/c/6e7566ba4739dd573c331adde1c96690f7a567bd