CVE-2026-72150: sunrpc: fix uninitialized xprt_create_args structure

CVE-2026-72150: sunrpc: fix uninitialized xprt_create_args structure

[Greg Kroah-Hartman]

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

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

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

sunrpc: fix uninitialized xprt_create_args structure

The xprt_create_args structure is allocated on the stack without
initialization in rpc_sysfs_xprt_switch_add_xprt_store(). While some
fields are manually populated, critical fields like srcaddr, bc_xps,
and flags contain uninitialized stack garbage.

This can lead to:
1. Kernel panic when xs_setup_xprt() dereferences garbage srcaddr
2. Information leak if srcaddr points to sensitive stack data
3. Unpredictable behavior if flags has random bits set

The fix is to zero-initialize the structure to ensure all unused
fields are NULL/0, preventing the transport setup code from acting
on garbage data.

The Linux kernel CVE team has assigned CVE-2026-72150 to this issue.


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

	Fixed in 6.18.40 with commit 933654508b2bc36e2c3c086c0365e2403fb2141f
	Fixed in 7.1.5 with commit 7d3ce3bd23c062a7c1c6d372d1b08e48b9e17cc3
	Fixed in 7.2-rc1 with commit 17d90b68c3a3d7d7e95b49e1fe9381a723f637a8

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-2026-72150
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:
	net/sunrpc/sysfs.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/933654508b2bc36e2c3c086c0365e2403fb2141f
	https://git.kernel.org/stable/c/7d3ce3bd23c062a7c1c6d372d1b08e48b9e17cc3
	https://git.kernel.org/stable/c/17d90b68c3a3d7d7e95b49e1fe9381a723f637a8