KVM: x86/xen: Initialize Xen timer only once

{
  "id": "492c8736cb901746cb7d06217319fb356049d7c5ad55cb1762e204f333e1e9c3",
  "url": "https://osv.dev/vulnerability/CVE-2022-50227",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "KVM: x86/xen: Initialize Xen timer only once",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: KVM: x86/xen: Initialize Xen timer only once Add a check for existing xen timers before initializing a new one. Currently kvm_xen_init_timer() is called on every KVM_XEN_VCPU_ATTR_TYPE_TIMER, which is causing the following ODEBUG crash when vcpu->arch.xen.timer is already set. ODEBUG: init active (active state 0) object type: hrtimer hint: xen_timer_callbac0 RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:502 Call Trace: __debug_object_init debug_hrtimer_init debug_init hrtimer_init kvm_xen_init_timer kvm_xen_vcpu_set_attr kvm_arch_vcpu_ioctl kvm_vcpu_ioctl vfs_ioctl",
    "evidence": "osv:CVE-2022-50227",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.19.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-50227",
      "aliases": [
        "CVE-2022-50227"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "536395260582be7443b0b35b0bbb89ffe3947f62"
                },
                {
                  "fixed": "9a9b5771e930f408c3419799000f76a9abaf2278"
                },
                {
                  "fixed": "af735db31285fa699384c649be72a9f32ecbb665"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50227.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.19.0"
                },
                {
                  "fixed": "5.19.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50227.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.266289143Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/9a9b5771e930f408c3419799000f76a9abaf2278",
        "https://git.kernel.org/stable/c/af735db31285fa699384c649be72a9f32ecbb665",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50227.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50227",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50227.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-50227",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489389,
  "published_at": "2025-06-18T11:03:59.885+00:00"
}