Bug 949981 (CVE-2013-1935) - CVE-2013-1935 kernel: kvm: pv_eoi guest updates with interrupts disabled
Summary: CVE-2013-1935 kernel: kvm: pv_eoi guest updates with interrupts disabled
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2013-1935
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: 906602 949985
Blocks: 949982 970962
TreeView+ depends on / blocked
 
Reported: 2013-04-09 12:21 UTC by Petr Matousek
Modified: 2021-02-17 07:51 UTC (History)
23 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-06-10 21:58:40 UTC


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2013:0907 0 normal SHIPPED_LIVE Important: rhev-hypervisor6 security and bug fix update 2013-06-11 00:25:13 UTC
Red Hat Product Errata RHSA-2013:0911 0 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2013-06-11 01:05:54 UTC

Description Petr Matousek 2013-04-09 12:21:40 UTC
A bug has been found in the way guest pv_eoi updates were handled before entering the guests. Upon synchronizing LAPIC to the guest's VAPIC,  kvm_write_guest_cached() (and thus copy_to_user()) could be called with interrupts disabled.

A local unprivileged user in the guest could potentially use this flaw to crash the host.

Comment 2 Petr Matousek 2013-04-09 12:33:59 UTC
Statement:

This issue does not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.

This issue does not affect the versions of KVM package as shipped with Red Hat Enterprise Linux 5.

Comment 3 Murray McAllister 2013-06-07 07:21:57 UTC
Acknowledgements:

Red Hat would like to thank IBM for reporting this issue.

Comment 4 errata-xmlrpc 2013-06-10 20:49:43 UTC
This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2013:0907 https://rhn.redhat.com/errata/RHSA-2013-0907.html

Comment 5 errata-xmlrpc 2013-06-10 21:51:20 UTC
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:0911 https://rhn.redhat.com/errata/RHSA-2013-0911.html


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