CVE-2009-3722

Severity: high (CVSS 7.1 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2009-10-30 · updated 2026-06-16
Weakness: CWE-264

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.

Affected products

Linux kernel: through 2.6.31; 2.6.0, 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.6.5 (+309)

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=0a79b009525b160081d75cef5dbf45817956acf2
http://marc.info/?l=oss-security&m=125678631403558&w=2
http://marc.info/?l=oss-security&m=125680666827148&w=2
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.30.9
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.31.1
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.32-rc1
http://www.mandriva.com/security/advisories?name=MDVSA-2010:198
http://www.redhat.com/support/errata/RHSA-2010-0126.html
http://www.securityfocus.com/bid/37221
http://www.ubuntu.com/usn/usn-864-1
https://bugzilla.redhat.com/show_bug.cgi?id=531660
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9892

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