CVE-2026-68444: firmware: arm_ffa: Fix NULL dereference in ffa_partition_info_get()

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

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

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

firmware: arm_ffa: Fix NULL dereference in ffa_partition_info_get()

ffa_partition_info_get() passes uuid_str directly to uuid_parse()
without a NULL check. When a caller passes NULL, uuid_parse() ->
__uuid_parse() -> uuid_is_valid() dereferences the pointer, causing
a kernel panic:

  |  Unable to handle kernel NULL pointer dereference at virtual address
  |  0000000000000040
  |  pc : uuid_parse+0x40/0xac
  |  lr : ffa_partition_info_get+0x1c/0x94 [arm_ffa]

Add a NULL guard before uuid_parse() so a NULL argument returns
-ENODEV instead of crashing. Callers are expected to always supply
a valid partition UUID, so NULL is not a supported input.

The Linux kernel CVE team has assigned CVE-2026-68444 to this issue.


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

	Issue introduced in 5.14 with commit d0c0bce831223b08e5bade2cefc93c3ddb790796 and fixed in 6.6.148 with commit 86f5ea90f73bb7154593bb96f3411e197f3d4fbe
	Issue introduced in 5.14 with commit d0c0bce831223b08e5bade2cefc93c3ddb790796 and fixed in 6.12.101 with commit 7201e56e52d18abf4cd0a2fee45daf9dc08b5b97
	Issue introduced in 5.14 with commit d0c0bce831223b08e5bade2cefc93c3ddb790796 and fixed in 6.18.42 with commit 996c5c19d5b5ac5b98a7b5a406b548305841c301
	Issue introduced in 5.14 with commit d0c0bce831223b08e5bade2cefc93c3ddb790796 and fixed in 7.1.6 with commit 12a42c610e4432e7708cc48d607e5903fffe0aad
	Issue introduced in 5.14 with commit d0c0bce831223b08e5bade2cefc93c3ddb790796 and fixed in 7.2-rc4 with commit 8ae5f8e4836667fcaffdf2e3c6068b0a8b364dd8

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-2026-68444
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/86f5ea90f73bb7154593bb96f3411e197f3d4fbe
	https://git.kernel.org/stable/c/7201e56e52d18abf4cd0a2fee45daf9dc08b5b97
	https://git.kernel.org/stable/c/996c5c19d5b5ac5b98a7b5a406b548305841c301
	https://git.kernel.org/stable/c/12a42c610e4432e7708cc48d607e5903fffe0aad
	https://git.kernel.org/stable/c/8ae5f8e4836667fcaffdf2e3c6068b0a8b364dd8