Bug 912898 (CVE-2013-0309) - CVE-2013-0309 kernel: mm: thp: pmd_present and PROT_NONE local DoS
Summary: CVE-2013-0309 kernel: mm: thp: pmd_present and PROT_NONE local DoS
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2013-0309
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: 858385
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-02-19 23:53 UTC by Petr Matousek
Modified: 2021-02-17 08:01 UTC (History)
27 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-05-08 18:41:27 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2013:0496 0 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 6 kernel update 2013-02-20 21:40:54 UTC

Description Petr Matousek 2013-02-19 23:53:15 UTC 
Most VM places are using pmd_none but a few are still using pmd_present. The meaning is about the same for the pmd. However pmd_present would return the wrong value on PROT_NONE ranges. When the code using pmd_present gets a false negative, the kernel will crash. An unprivileged local user could use this flaw to crash the system.

Upstream fix:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=027ef6c8
Comment 1 Petr Matousek 2013-02-20 00:49:02 UTC 
Statement:

This issue did affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 6.

This issue did not affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.
Comment 2 errata-xmlrpc 2013-02-21 07:02:34 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:0496 https://rhn.redhat.com/errata/RHSA-2013-0496.html
Note You need to log in before you can comment on or make changes to this bug.