CVE-2009-2287: Null Pointer Dereference
First published: Wed Jul 01 2009(Updated: )
The kvm_arch_vcpu_ioctl_set_sregs function in the KVM in Linux kernel 2.6 before 2.6.30, when running on x86 systems, does not validate the page table root in a KVM_SET_SREGS call, which allows local users to cause a denial of service (crash or hang) via a crafted cr3 value, which triggers a NULL pointer dereference in the gfn_to_rmap function.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | >=2.6.0<2.6.30 | |
| Ubuntu Linux | =6.06 | |
| Ubuntu Linux | =8.04 | |
| Ubuntu Linux | =8.10 | |
| Ubuntu Linux | =9.04 | |
| Debian | =4.0 | |
| Debian | =5.0 | |
| Linux Kernel | >=2.6.0<2.6.30 | |
| Ubuntu | =6.06 | |
| Ubuntu | =8.04 | |
| Ubuntu | =8.10 | |
| Ubuntu | =9.04 |
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Reference Links
- http://sourceforge.net/tracker/?func=detail&atid=893831&aid=2687641&group_id=180599
- http://www.openwall.com/lists/oss-security/2009/06/30/1
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=59839dfff5eabca01cc4e20b45797a60a80af8cb
- http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git;a=blob;f=queue-2.6.30/kvm-x86-check-for-cr3-validity-in-ioctl_set_sregs.patch;h=b48a47dad2cf76358b327368f80c0805e6370c68;hb=e7c45b24f298b5d9efd7d401150f64a1b51aaac4
- http://secunia.com/advisories/35675
- http://www.ubuntu.com/usn/usn-807-1
- http://secunia.com/advisories/36054
- http://secunia.com/advisories/36045
- http://www.debian.org/security/2009/dsa-1845
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:198
- http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git%3Ba=blob%3Bf=queue-2.6.30/kvm-x86-check-for-cr3-validity-in-ioctl_set_sregs.patch%3Bh=b48a47dad2cf76358b327368f80c0805e6370c68%3Bhb=e7c45b24f298b5d9efd7d401150f64a1b51aaac4
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=59839dfff5eabca01cc4e20b45797a60a80af8cb
Frequently Asked Questions
What is the severity of CVE-2009-2287?
CVE-2009-2287 is classified as a high-severity vulnerability due to its potential to cause denial of service.
How do I fix CVE-2009-2287?
To fix CVE-2009-2287, upgrade your Linux kernel to version 2.6.30 or later.
Which systems are affected by CVE-2009-2287?
CVE-2009-2287 affects Linux kernel versions before 2.6.30 running on x86 systems, as well as specific versions of Ubuntu and Debian.
Can CVE-2009-2287 lead to data loss?
While CVE-2009-2287 primarily causes denial of service, it may indirectly lead to data loss due to system crashes or hangs.
Are there any known exploits for CVE-2009-2287?
Yes, there are known exploits for CVE-2009-2287 that could allow local users to crash or hang affected systems through crafted KVM_SET_SREGS calls.
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