CVE-2024-50139

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