Bug 1779594 (CVE-2019-19332) - CVE-2019-19332 Kernel: kvm: OOB memory write via kvm_dev_ioctl_get_cpuid
Summary: CVE-2019-19332 Kernel: kvm: OOB memory write via kvm_dev_ioctl_get_cpuid
Keywords:
Status: NEW
Alias: CVE-2019-19332
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1783455 1783456 1783457 1783458 1783451
Blocks: 1779591
TreeView+ depends on / blocked
 
Reported: 2019-12-04 10:36 UTC by Prasad J Pandit
Modified: 2019-12-17 17:39 UTC (History)
45 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
An out-of-bounds memory write issue was found in the way the Linux kernel's KVM hypervisor handled the 'KVM_GET_EMULATED_CPUID' ioctl(2) request to get CPUID features emulated by the KVM hypervisor. A user or process able to access the '/dev/kvm' device could use this flaw to crash the system, resulting in a denial of service.
Clone Of:
Environment:
Last Closed:


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Description Prasad J Pandit 2019-12-04 10:36:39 UTC
An OOB memory write issue was found in the way Linux kernel's KVM hypervisor
handled 'KVM_GET_EMULATED_CPUID' ioctl(2) request to get cpuid features emulated by the KVM hypervisor.

A user/process able to access '/dev/kvm' device could use this flaw to crash the system resulting in DoS issue.

Upstream patch:
---------------
  -> https://git.kernel.org/linus/433f4ba1904100da65a311033f17a9bf586b287e

Reference:
  -> https://lore.kernel.org/kvm/000000000000ea5ec20598d90e50@google.com/

Comment 2 Prasad J Pandit 2019-12-13 19:25:54 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1783451]

Comment 4 Prasad J Pandit 2019-12-13 19:33:00 UTC
Statement:

This issue does not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG 2.

This issue affects the version of the kernel package as shipped with Red Hat Enterprise Linux 7 and 8. Future kernel updates for Red Hat Enterprise Linux 7 and 8 may address this issue.


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