CVE-2026-72293: KVM: s390: vsie: Add missing radix_tree_preload() in _gaccess_shadow_fault()

CVE-2026-72293: KVM: s390: vsie: Add missing radix_tree_preload() in _gaccess_shadow_fault()

[Greg Kroah-Hartman]

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

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

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

KVM: s390: vsie: Add missing radix_tree_preload() in _gaccess_shadow_fault()

Add missing radix_tree_preload() in _gaccess_shadow_fault() to
guarantee forward progress. The core of _gaccess_shadow_fault() has
been split into ___gaccess_shadow_fault() in order to simplify locking.

The Linux kernel CVE team has assigned CVE-2026-72293 to this issue.


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

	Issue introduced in 7.0 with commit e38c884df92119d96f652d51f82661dd2fc0b885 and fixed in 7.1.5 with commit 0c3d4ca328e661cb4eda3bb344ea17e4b6a63171
	Issue introduced in 7.0 with commit e38c884df92119d96f652d51f82661dd2fc0b885 and fixed in 7.2-rc1 with commit 668e70cc545e2659f3c4adad20a0883533042473

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-2026-72293
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:
	arch/s390/kvm/gaccess.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/0c3d4ca328e661cb4eda3bb344ea17e4b6a63171
	https://git.kernel.org/stable/c/668e70cc545e2659f3c4adad20a0883533042473