linux-cve-announce - CVE-2025-37849: KVM: arm64: Tear down vGIC on failed vCPU creation

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Message-ID: <2025050918-CVE-2025-37849-2a30@gregkh>
Date: Fri,  9 May 2025 08:42:27 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37849: KVM: arm64: Tear down vGIC on failed vCPU creation

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

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

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

KVM: arm64: Tear down vGIC on failed vCPU creation

If kvm_arch_vcpu_create() fails to share the vCPU page with the
hypervisor, we propagate the error back to the ioctl but leave the
vGIC vCPU data initialised. Note only does this leak the corresponding
memory when the vCPU is destroyed but it can also lead to use-after-free
if the redistributor device handling tries to walk into the vCPU.

Add the missing cleanup to kvm_arch_vcpu_create(), ensuring that the
vGIC vCPU structures are destroyed on error.

The Linux kernel CVE team has assigned CVE-2025-37849 to this issue.


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

	Fixed in 6.1.135 with commit 07476e0d932afc53c05468076393ac35d0b4999e
	Fixed in 6.6.88 with commit 5085e02362b9948f82fceca979b8f8e12acb1cc5
	Fixed in 6.12.24 with commit c322789613407647a05ff5c451a7bf545fb34e73
	Fixed in 6.13.12 with commit 2480326eba8ae9ccc5e4c3c2dc8d407db68e3c52
	Fixed in 6.14.3 with commit f1e9087abaeedec9bf2894a282ee4f0d8383f299
	Fixed in 6.15-rc1 with commit 250f25367b58d8c65a1b060a2dda037eea09a672

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-2025-37849
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/arm.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/07476e0d932afc53c05468076393ac35d0b4999e
	https://git.kernel.org/stable/c/5085e02362b9948f82fceca979b8f8e12acb1cc5
	https://git.kernel.org/stable/c/c322789613407647a05ff5c451a7bf545fb34e73
	https://git.kernel.org/stable/c/2480326eba8ae9ccc5e4c3c2dc8d407db68e3c52
	https://git.kernel.org/stable/c/f1e9087abaeedec9bf2894a282ee4f0d8383f299
	https://git.kernel.org/stable/c/250f25367b58d8c65a1b060a2dda037eea09a672