CVE-2026-64081: firmware: arm_ffa: Validate framework notification message layout

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

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

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

firmware: arm_ffa: Validate framework notification message layout

Framework notifications carry an indirect message in the shared RX
buffer. Validate the reported offset and size before using them, reject
zero-length payloads, and ensure that any non-header payload starts at
the UUID field rather than in the middle of the message header.

Use the validated offset and size values for both kmemdup() and the UUID
parsing path so malformed firmware data cannot drive an out-of-bounds
read or an oversized allocation.

The Linux kernel CVE team has assigned CVE-2026-64081 to this issue.


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

	Issue introduced in 6.15 with commit 285a5ea0f542db94c3ed11e01a71abb47d15cbf5 and fixed in 6.18.34 with commit 3c51d99449dc5a01c08a7fce6071d6721f5aac83
	Issue introduced in 6.15 with commit 285a5ea0f542db94c3ed11e01a71abb47d15cbf5 and fixed in 7.0.11 with commit 76eb90e2b03de147e12ab68ea8afd8ea0342df0a
	Issue introduced in 6.15 with commit 285a5ea0f542db94c3ed11e01a71abb47d15cbf5 and fixed in 7.1 with commit 4a1cc9e96b311d2609a6f963a5e35bd4ae730d97

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-2026-64081
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/firmware/arm_ffa/driver.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/3c51d99449dc5a01c08a7fce6071d6721f5aac83
	https://git.kernel.org/stable/c/76eb90e2b03de147e12ab68ea8afd8ea0342df0a
	https://git.kernel.org/stable/c/4a1cc9e96b311d2609a6f963a5e35bd4ae730d97