KVM: VMX: Do _all_ initialization before exposing /dev/kvm to userspace

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2022-49932
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-05-02 16:15:22 UTC
Updated2026-11-05 20:17:18 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Do _all_ initialization before exposing /dev/kvm to userspace Call kvm_init() only after _all_ setup is complete, as kvm_init() exposes /dev/kvm to userspace and thus allows userspace to create VMs (and call other ioctls). E.g. KVM will encounter a NULL pointer when attempting to add a vCPU to the per-CPU loaded_vmcss_on_cpu list if userspace is able to create a VM before vmx_init() configures said list. BUG: kernel NULL pointer dereference, address: 0000000000000008 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] SMP CPU: 6 PID: 1143 Comm: stable Not tainted 6.0.0-rc7+ #988 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:vmx_vcpu_load_vmcs+0x68/0x230 [kvm_intel] <TASK> vmx_vcpu_load+0x16/0x60 [kvm_intel] kvm_arch_vcpu_load+0x32/0x1f0 [kvm] vcpu_load+0x2f/0x40 [kvm] kvm_arch_vcpu_create+0x231/0x310 [kvm] kvm_vm_ioctl+0x79f/0xe10 [kvm] ? handle_mm_fault+0xb1/0x220 __x64_sys_ioctl+0x80/0xb0 do_syscall_64+0x2b/0x50 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f5a6b05743b </TASK> Modules linked in: vhost_net vhost vhost_iotlb tap kvm_intel(+) kvm irqbypass

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected dbef2808af6c594922fe32833b30f55f35e9da6d e136e969d268b9b89329c816c002e53f60e82985 git Not specified
CNA Linux Linux affected dbef2808af6c594922fe32833b30f55f35e9da6d e28533c08023c4b319b7f2cd77f3f7c9204eb517 git Not specified
CNA Linux Linux affected dbef2808af6c594922fe32833b30f55f35e9da6d e32b120071ea114efc0b4ddd439547750b85f618 git Not specified
CNA Linux Linux affected b2f7d0adc1260fa33ff3e992d18ff15873e68a67 git Not specified
CNA Linux Linux affected 2c0bf2560ca18abe1451db23b8ef8700c67cc44f git Not specified
CNA Linux Linux affected f9971a898a815c2a6cce2932e91a576b28ed4cce git Not specified
CNA Linux Linux affected 40888c31aca3a46f266f1f121679f8e1982df085 git Not specified
CNA Linux Linux affected cd3f438fbb9cb60da32dd2b665f7dc9baba1c4ad git Not specified
CNA Linux Linux affected e35a2dc8c7f664ae8a9cc46d19985dc79bfc1083 git Not specified
CNA Linux Linux affected 4.9.220 4.10 semver Not specified
CNA Linux Linux affected 4.14.177 4.15 semver Not specified
CNA Linux Linux affected 4.19.116 4.20 semver Not specified
CNA Linux Linux affected 5.4.33 5.5 semver Not specified
CNA Linux Linux affected 5.5.18 5.6 semver Not specified
CNA Linux Linux affected 5.6.5 5.7 semver Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 6.1.20 6.1.* semver Not specified
CNA Linux Linux unaffected 6.2.7 6.2.* semver Not specified
CNA Linux Linux unaffected 6.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e136e969d268b9b89329c816c002e53f60e82985 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e32b120071ea114efc0b4ddd439547750b85f618 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e28533c08023c4b319b7f2cd77f3f7c9204eb517 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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