linux-cve-announce - CVE-2024-53228: riscv: kvm: Fix out-of-bounds array access

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Message-ID: <2024122736-CVE-2024-53228-0c5f@gregkh>
Date: Fri, 27 Dec 2024 14:53:14 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-53228: riscv: kvm: Fix out-of-bounds array access

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

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

riscv: kvm: Fix out-of-bounds array access

In kvm_riscv_vcpu_sbi_init() the entry->ext_idx can contain an
out-of-bound index. This is used as a special marker for the base
extensions, that cannot be disabled. However, when traversing the
extensions, that special marker is not checked prior indexing the
array.

Add an out-of-bounds check to the function.

The Linux kernel CVE team has assigned CVE-2024-53228 to this issue.


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

	Issue introduced in 6.7 with commit 56d8a385b60556019ecb45d6098830c9ef6a13e0 and fixed in 6.11.11 with commit 3c49e1084a5df99807fc43dd318c491e6cbaa168
	Issue introduced in 6.7 with commit 56d8a385b60556019ecb45d6098830c9ef6a13e0 and fixed in 6.12.2 with commit b1af648f0d610665c956ea4604d9f797e5c7e991
	Issue introduced in 6.7 with commit 56d8a385b60556019ecb45d6098830c9ef6a13e0 and fixed in 6.13-rc1 with commit 332fa4a802b16ccb727199da685294f85f9880cb

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-2024-53228
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/riscv/kvm/vcpu_sbi.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/3c49e1084a5df99807fc43dd318c491e6cbaa168
	https://git.kernel.org/stable/c/b1af648f0d610665c956ea4604d9f797e5c7e991
	https://git.kernel.org/stable/c/332fa4a802b16ccb727199da685294f85f9880cb