ghsa-48p3-p675-p77f
Vulnerability from github
Published
2025-06-18 12:30
Modified
2025-06-18 12:30
Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50227"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-18T11:15:53Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/xen: Initialize Xen timer only once\n\nAdd a check for existing xen timers before initializing a new one.\n\nCurrently kvm_xen_init_timer() is called on every\nKVM_XEN_VCPU_ATTR_TYPE_TIMER, which is causing the following ODEBUG\ncrash when vcpu-\u003earch.xen.timer is already set.\n\nODEBUG: init active (active state 0)\nobject type: hrtimer hint: xen_timer_callbac0\nRIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:502\nCall Trace:\n__debug_object_init\ndebug_hrtimer_init\ndebug_init\nhrtimer_init\nkvm_xen_init_timer\nkvm_xen_vcpu_set_attr\nkvm_arch_vcpu_ioctl\nkvm_vcpu_ioctl\nvfs_ioctl",
  "id": "GHSA-48p3-p675-p77f",
  "modified": "2025-06-18T12:30:57Z",
  "published": "2025-06-18T12:30:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50227"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a9b5771e930f408c3419799000f76a9abaf2278"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af735db31285fa699384c649be72a9f32ecbb665"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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