CVE-2009-3722

CVE-2009-3722 is a high-severity vulnerability in Linux Linux Kernel with a CVSS 2.0 base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-264.

Key facts

Description

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.

Frequently asked questions

What is CVE-2009-3722?
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.
How severe is CVE-2009-3722?
CVE-2009-3722 has a CVSS 2.0 base score of 7.1, rated high severity.
Is CVE-2009-3722 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3722?
CVE-2009-3722 primarily affects Linux Linux Kernel. In total, 316 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3722?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2009-3722 published?
CVE-2009-3722 was published on 2009-10-30 and last updated on 2026-06-16.

References

Affected products (316)

More vulnerabilities in Linux Linux Kernel

All CVEs affecting Linux Linux Kernel →

Other CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities

Browse all CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities →