CVE-2023-53319

/// Technical description

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

KVM: arm64: Handle kvm_arm_init failure correctly in finalize_pkvm

Currently there is no synchronisation between finalize_pkvm() and

kvm_arm_init() initcalls. The finalize_pkvm() proceeds happily even if

kvm_arm_init() fails resulting in the following warning on all the CPUs

and eventually a HYP panic:

| kvm [1]: IPA Size Limit: 48 bits

| kvm [1]: Failed to init hyp memory protection

| kvm [1]: error initializing Hyp mode: -22

|

| <snip>

|

| WARNING: CPU: 0 PID: 0 at arch/arm64/kvm/pkvm.c:226 _kvm_host_prot_finalize+0x30/0x50

| Modules linked in:

| CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.4.0 #237

| Hardware name: FVP Base RevC (DT)

| pstate: 634020c5 (nZCv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--)

| pc : _kvm_host_prot_finalize+0x30/0x50

| lr : __flush_smp_call_function_queue+0xd8/0x230

|

| Call trace:

| _kvm_host_prot_finalize+0x3c/0x50

| on_each_cpu_cond_mask+0x3c/0x6c

| p

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References