CVE-2009-3640 Null dereference in n/a

What is CVE-2009-3640?

CVE-2009-3640 is a medium-severity vulnerability in Linux kernel, published on 29 Oct 2009. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The update_cr8_intercept function in arch/x86/kvm/x86.c in the KVM subsystem in the Linux kernel before 2.6.32-rc1 does not properly handle the absence of an Advanced Programmable Interrupt Controller (APIC), which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly gain privileges via a call to the kvm_vcpu_ioctl function.

Weakness: CWE-20

Which versions are affected by CVE-2009-3640?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2009-3640?

No fix has been published for CVE-2009-3640 yet. Limit exposure of the affected software until one is available.

Is CVE-2009-3640 being exploited?

There is no known exploitation of CVE-2009-3640 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-qw65-p7j7-cg58.