CVE-2026-72281: KVM: arm64: account pKVM reclaim against the VM mm

CVE-2026-72281: KVM: arm64: account pKVM reclaim against the VM mm

[Greg Kroah-Hartman]

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

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

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

KVM: arm64: account pKVM reclaim against the VM mm

Protected guest faults charge long term pins to the VM's mm. Teardown
can run later from file release, where current->mm may be unrelated.

Drop the charge from kvm->mm instead.

The Linux kernel CVE team has assigned CVE-2026-72281 to this issue.


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

	Issue introduced in 7.1 with commit 4e6e03f9eaddb6be5ca8477dc5642e94ddece47e and fixed in 7.1.5 with commit 34d8d7242c52c174add6b413d56420aa60f8054c
	Issue introduced in 7.1 with commit 4e6e03f9eaddb6be5ca8477dc5642e94ddece47e and fixed in 7.2-rc4 with commit d098bb75d14fde2f12155f1a95ec0168160867ce

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-2026-72281
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/arm64/kvm/pkvm.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/34d8d7242c52c174add6b413d56420aa60f8054c
	https://git.kernel.org/stable/c/d098bb75d14fde2f12155f1a95ec0168160867ce