linux-cve-announce - CVE-2024-40989: KVM: arm64: Disassociate vcpus from redistributor region on teardown

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Message-ID: <2024071249-CVE-2024-40989-c8da@gregkh>
Date: Fri, 12 Jul 2024 14:37:53 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-40989: KVM: arm64: Disassociate vcpus from redistributor region on teardown

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

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

KVM: arm64: Disassociate vcpus from redistributor region on teardown

When tearing down a redistributor region, make sure we don't have
any dangling pointer to that region stored in a vcpu.

The Linux kernel CVE team has assigned CVE-2024-40989 to this issue.


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

	Issue introduced in 5.13 with commit e5a35635464b and fixed in 6.1.96 with commit 68df4fc449fc
	Issue introduced in 5.13 with commit e5a35635464b and fixed in 6.6.36 with commit 48bb62859d47
	Issue introduced in 5.13 with commit e5a35635464b and fixed in 6.9.7 with commit 152b4123f21e
	Issue introduced in 5.13 with commit e5a35635464b and fixed in 6.10-rc5 with commit 0d92e4a7ffd5

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-2024-40989
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/vgic/vgic-init.c
	arch/arm64/kvm/vgic/vgic-mmio-v3.c
	arch/arm64/kvm/vgic/vgic.h


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/68df4fc449fcc24347209e500ce26d5816705a77
	https://git.kernel.org/stable/c/48bb62859d47c5c4197a8c01128d0fa4f46ee58c
	https://git.kernel.org/stable/c/152b4123f21e6aff31cea01158176ad96a999c76
	https://git.kernel.org/stable/c/0d92e4a7ffd5c42b9fa864692f82476c0bf8bcc8