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Fencer Vulns
high 7.1

CVE-2009-3722 json

The handle_dr function in arch/x86/kvm/vmx.c in the KVM subsystem in the Linux kernel before 2.6.31.1 does not properly verify the Current…

published 2009-10-30 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3695

cvss
7.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

The handle_dr function in arch/x86/kvm/vmx.c in the KVM subsystem in the Linux kernel before 2.6.31.1 does not properly verify the Current Privilege Level (CPL) before accessing a debug register, which allows guest OS users to cause a denial of service (trap) on the host OS via a crafted application.

Patch / fix

  • rhev-hypervisor RHEL 5 5.4-2.1.10.el5_4rhev2_1
  • rhev-hypervisor-pxe RHEL 5 5.4-2.1.10.el5_4rhev2_1
  • kvm RHEL 5 VIRTUALIZATION 83-105.el5_4.27
  • kmod-kvm RHEL 5 VIRTUALIZATION 83-105.el5_4.27
  • kvm-tools RHEL 5 VIRTUALIZATION 83-105.el5_4.27
  • kvm-qemu-img RHEL 5 VIRTUALIZATION 83-105.el5_4.27

red hat advisories RHSA-2010:0172RHSA-2010:0126

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-3722 updated cvss 4.9

KVM: Check cpl before emulating debug register access

  • Red Hat Enterprise Linux Desktop Multi OS (v. 5 client) kvm 83-105.el5_4.27, kmod-kvm 83-105.el5_4.27, kvm-tools 83-105.el5_4.27, kvm-qemu-img 83-105.el5_4.27 Red Hat Enterprise Linux Virtualization (v. 5 server) kvm 83-105.el5_4.27, kmod-kvm 83-105.el5_4.27, kvm-tools 83-105.el5_4.27, kvm-qemu-img 83-105.el5_4.27
    fixed: vendor fix RHSA-2010:0126
  • Red Hat Enterprise Virtualization Hypervisor 5 rhev-hypervisor 5.4-2.1.10.el5_4rhev2_1, rhev-hypervisor-pxe 5.4-2.1.10.el5_4rhev2_1
    fixed: vendor fix RHSA-2010:0172

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.28% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 7.1 AV:N/AC:M/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.