Bug 530515 (CVE-2009-3638) - CVE-2009-3638 kernel: kvm: integer overflow in kvm_dev_ioctl_get_supported_cpuid()
Summary: CVE-2009-3638 kernel: kvm: integer overflow in kvm_dev_ioctl_get_supported_cp...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2009-3638
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2009-10-23 09:00 UTC by Eugene Teo (Security Response)
Modified: 2019-09-29 12:33 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2009-10-26 03:16:05 UTC


Attachments (Terms of Use)

Description Eugene Teo (Security Response) 2009-10-23 09:00:41 UTC
Quote from the upstream commit:
"The number of entries is multiplied by the entry size, which can overflow on 32-bit hosts.  Bound the entry count instead."

 	if (cpuid->nent < 1)
 		goto out;
+	if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
+		cpuid->nent = KVM_MAX_CPUID_ENTRIES;
 	r = -ENOMEM;
 	cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
 	if (!cpuid_entries)

This one can be triggered if /dev/kvm is user accessible (which is recommended...). This was introduced in v2.6.25-rc1, and fixed in v2.6.32-rc4. Only affects 32-bit machines.

References:
http://git.kernel.org/linus/0771671749b59a507b6da4efb931c44d9691e248
http://git.kernel.org/linus/6a54435560efdab1a08f429a954df4d6c740bddf

Comment 1 Chuck Ebbert 2009-10-23 13:27:28 UTC
Also fixed in 2.6.31.4

Comment 2 Eugene Teo (Security Response) 2009-10-26 03:16:05 UTC
(In reply to comment #0)
[...]
> This one can be triggered if /dev/kvm is user accessible (which is
> recommended...). This was introduced in v2.6.25-rc1, and fixed in v2.6.32-rc4.
> Only affects 32-bit machines.

Since this affects 32-bit machines, and we only support x86_64 KVM hosts on Red Hat Enterprise Linux 5, this bug will be closed as NOTABUG.

Comment 3 Fedora Update System 2009-11-05 05:05:43 UTC
kernel-2.6.30.9-96.fc11 has been submitted as an update for Fedora 11.
http://admin.fedoraproject.org/updates/kernel-2.6.30.9-96.fc11

Comment 4 Fedora Update System 2009-11-05 05:14:38 UTC
kernel-2.6.27.38-170.2.113.fc10 has been submitted as an update for Fedora 10.
http://admin.fedoraproject.org/updates/kernel-2.6.27.38-170.2.113.fc10

Comment 5 Fedora Update System 2009-11-06 00:02:56 UTC
kernel-2.6.30.9-96.fc11 has been pushed to the Fedora 11 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2009-11-06 00:04:51 UTC
kernel-2.6.27.38-170.2.113.fc10 has been pushed to the Fedora 10 stable repository.  If problems still persist, please make note of it in this bug report.


Note You need to log in before you can comment on or make changes to this bug.