Riskcovery

CVE-2022-50227

KVM: x86/xen: Initialize Xen timer only once

State
Published
Severity
7.8 High
Published
Jun 18, 2025
Updated
Aug 5, 2026
Reserved
Jun 18, 2025

Read the record on cve.org

Description

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

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 536395260582be7443b0b35b0bbb89ffe3947f62 to before 9a9b5771e930f408c3419799000f76a9abaf2278Affected
  • 536395260582be7443b0b35b0bbb89ffe3947f62 to before af735db31285fa699384c649be72a9f32ecbb665Affected
LinuxLinux
  • 5.19Affected
  • before 5.19Not affected
  • 5.19.2 through 5.19.*Not affected
  • 6.0 and laterNot affected

References

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