linux-cve-announce - CVE-2024-50139: KVM: arm64: Fix shift-out-of-bounds bug

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Message-ID: <2024110740-CVE-2024-50139-9ac6@gregkh>
Date: Thu,  7 Nov 2024 10:34:39 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50139: KVM: arm64: Fix shift-out-of-bounds bug

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

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

KVM: arm64: Fix shift-out-of-bounds bug

Fix a shift-out-of-bounds bug reported by UBSAN when running
VM with MTE enabled host kernel.

UBSAN: shift-out-of-bounds in arch/arm64/kvm/sys_regs.c:1988:14
shift exponent 33 is too large for 32-bit type 'int'
CPU: 26 UID: 0 PID: 7629 Comm: qemu-kvm Not tainted 6.12.0-rc2 #34
Hardware name: IEI NF5280R7/Mitchell MB, BIOS 00.00. 2024-10-12 09:28:54 10/14/2024
Call trace:
 dump_backtrace+0xa0/0x128
 show_stack+0x20/0x38
 dump_stack_lvl+0x74/0x90
 dump_stack+0x18/0x28
 __ubsan_handle_shift_out_of_bounds+0xf8/0x1e0
 reset_clidr+0x10c/0x1c8
 kvm_reset_sys_regs+0x50/0x1c8
 kvm_reset_vcpu+0xec/0x2b0
 __kvm_vcpu_set_target+0x84/0x158
 kvm_vcpu_set_target+0x138/0x168
 kvm_arch_vcpu_ioctl_vcpu_init+0x40/0x2b0
 kvm_arch_vcpu_ioctl+0x28c/0x4b8
 kvm_vcpu_ioctl+0x4bc/0x7a8
 __arm64_sys_ioctl+0xb4/0x100
 invoke_syscall+0x70/0x100
 el0_svc_common.constprop.0+0x48/0xf0
 do_el0_svc+0x24/0x38
 el0_svc+0x3c/0x158
 el0t_64_sync_handler+0x120/0x130
 el0t_64_sync+0x194/0x198

The Linux kernel CVE team has assigned CVE-2024-50139 to this issue.

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

	Issue introduced in 6.3 with commit 7af0c2534f4c and fixed in 6.6.59 with commit 04ed2ba07ce7
	Issue introduced in 6.3 with commit 7af0c2534f4c and fixed in 6.11.6 with commit 4b9e11794d91
	Issue introduced in 6.3 with commit 7af0c2534f4c and fixed in 6.12-rc5 with commit c6c167afa090

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-2024-50139
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/sys_regs.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/04ed2ba07ce73f323052475fbd33d647aca3ff2e
	https://git.kernel.org/stable/c/4b9e11794d910aa55300debbac5f0adcc42c491a
	https://git.kernel.org/stable/c/c6c167afa090ea0451f91814e1318755a8fb8bb9