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CVE-2022-49932 (GCVE-0-2022-49932)

Vulnerability from cvelistv5 – Published: 2025-05-02 15:54 – Updated: 2026-05-23 15:23
VLAI
Title
KVM: VMX: Do _all_ initialization before exposing /dev/kvm to userspace
Summary
In 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
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: dbef2808af6c594922fe32833b30f55f35e9da6d , < e136e969d268b9b89329c816c002e53f60e82985 (git)
Affected: dbef2808af6c594922fe32833b30f55f35e9da6d , < e28533c08023c4b319b7f2cd77f3f7c9204eb517 (git)
Affected: dbef2808af6c594922fe32833b30f55f35e9da6d , < e32b120071ea114efc0b4ddd439547750b85f618 (git)
Affected: b2f7d0adc1260fa33ff3e992d18ff15873e68a67 (git)
Affected: 2c0bf2560ca18abe1451db23b8ef8700c67cc44f (git)
Affected: f9971a898a815c2a6cce2932e91a576b28ed4cce (git)
Affected: 40888c31aca3a46f266f1f121679f8e1982df085 (git)
Affected: cd3f438fbb9cb60da32dd2b665f7dc9baba1c4ad (git)
Affected: e35a2dc8c7f664ae8a9cc46d19985dc79bfc1083 (git)
Affected: 4.9.220 , < 4.10 (semver)
Affected: 4.14.177 , < 4.15 (semver)
Affected: 4.19.116 , < 4.20 (semver)
Affected: 5.4.33 , < 5.5 (semver)
Affected: 5.5.18 , < 5.6 (semver)
Affected: 5.6.5 , < 5.7 (semver)
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Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 6.1.20 , ≤ 6.1.* (semver)
Unaffected: 6.2.7 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: VMX: Do _all_ initialization before exposing /dev/kvm to userspace\n\nCall kvm_init() only after _all_ setup is complete, as kvm_init() exposes\n/dev/kvm to userspace and thus allows userspace to create VMs (and call\nother ioctls).  E.g. KVM will encounter a NULL pointer when attempting to\nadd a vCPU to the per-CPU loaded_vmcss_on_cpu list if userspace is able to\ncreate a VM before vmx_init() configures said list.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000008\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 0 P4D 0\n Oops: 0002 [#1] SMP\n CPU: 6 PID: 1143 Comm: stable Not tainted 6.0.0-rc7+ #988\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n RIP: 0010:vmx_vcpu_load_vmcs+0x68/0x230 [kvm_intel]\n  \u003cTASK\u003e\n  vmx_vcpu_load+0x16/0x60 [kvm_intel]\n  kvm_arch_vcpu_load+0x32/0x1f0 [kvm]\n  vcpu_load+0x2f/0x40 [kvm]\n  kvm_arch_vcpu_create+0x231/0x310 [kvm]\n  kvm_vm_ioctl+0x79f/0xe10 [kvm]\n  ? handle_mm_fault+0xb1/0x220\n  __x64_sys_ioctl+0x80/0xb0\n  do_syscall_64+0x2b/0x50\n  entry_SYSCALL_64_after_hwframe+0x46/0xb0\n RIP: 0033:0x7f5a6b05743b\n  \u003c/TASK\u003e\n Modules linked in: vhost_net vhost vhost_iotlb tap kvm_intel(+) kvm irqbypass"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: VMX: Inicializa _toda_ la instancia antes de exponer /dev/kvm al espacio de usuario. Llama a kvm_init() solo despu\u00e9s de que se complete la configuraci\u00f3n _toda_, ya que kvm_init() expone /dev/kvm al espacio de usuario y, por lo tanto, permite que este cree m\u00e1quinas virtuales (y llame a otras ioctl). Por ejemplo, KVM encontrar\u00e1 un puntero nulo al intentar agregar una vCPU a la lista por CPU load_vmcss_on_cpu si el espacio de usuario puede crear una m\u00e1quina virtual antes de que vmx_init() configure dicha lista. ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000008 #PF: acceso de escritura del supervisor en modo kernel #PF: error_code(0x0002) - p\u00e1gina no presente PGD 0 P4D 0 Oops: 0002 [#1] CPU SMP: 6 PID: 1143 Comm: estable No contaminado 6.0.0-rc7+ #988 Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:vmx_vcpu_load_vmcs+0x68/0x230 [kvm_intel]  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  M\u00f3dulos vinculados en: vhost_net vhost vhost_iotlb tap kvm_intel(+) kvm irqbypass"
          }
        ],
        "id": "CVE-2022-49932",
        "lastModified": "2026-06-17T05:19:34.057",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
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          ]
        },
        "published": "2025-05-02T16:15:22.070",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e136e969d268b9b89329c816c002e53f60e82985"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e28533c08023c4b319b7f2cd77f3f7c9204eb517"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e32b120071ea114efc0b4ddd439547750b85f618"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:33:08+00:00",
      "cve": "CVE-2022-49932",
      "id": "CVE-2022-49932",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: VMX: Do _all_ initialization before exposing /dev/kvm to userspace",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49932.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.