Bug 1444493 (CVE-2017-7889) - CVE-2017-7889 kernel: mm subsystem does not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism
Summary: CVE-2017-7889 kernel: mm subsystem does not properly enforce the CONFIG_STRIC...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-7889
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: 1444496 1449676 1449677 1449678 1449679
Blocks: 1444498
TreeView+ depends on / blocked
 
Reported: 2017-04-21 12:48 UTC by Adam Mariš
Modified: 2021-02-17 02:13 UTC (History)
30 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
The mm subsystem in the Linux kernel through 4.10.10 does not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism, which allows local users to read or write to kernel memory locations in the first megabyte (and bypass slab-allocation access restrictions) via an application that opens the /dev/mem file, related to arch/x86/mm/init.c and drivers/char/mem.c.
Clone Of:
Environment:
Last Closed: 2019-06-08 03:11:01 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1842 0 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2017-08-01 18:22:09 UTC
Red Hat Product Errata RHSA-2017:2077 0 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2017-08-01 18:13:37 UTC
Red Hat Product Errata RHSA-2017:2669 0 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2017-09-07 00:36:52 UTC
Red Hat Product Errata RHSA-2018:1854 0 None None None 2018-06-19 04:49:34 UTC

Description Adam Mariš 2017-04-21 12:48:33 UTC 
The mm subsystem in the Linux kernel through 4.10.10 does not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism, which allows local users to read or write to kernel memory locations in the first megabyte (and bypass slab-allocation access restrictions) via an application that opens the /dev/mem file, related to arch/x86/mm/init.c and drivers/char/mem.c.

Discussion:

http://seclists.org/oss-sec/2017/q2/76

Upstream patch:

https://github.com/torvalds/linux/commit/a4866aa812518ed1a37d8ea0c881dc946409de94
Comment 1 Adam Mariš 2017-04-21 12:53:08 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1444496]
Comment 3 Vladis Dronov 2017-05-10 12:24:28 UTC 
Statement:

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5. This is not currently planned to be addressed in future updates of the product due to its life cycle. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

This issue affects the versions of the Linux kernel as shipped with
Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2. Future kernel
updates for Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2 may
address this issue.
Comment 8 errata-xmlrpc 2017-08-01 19:15:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2077 https://access.redhat.com/errata/RHSA-2017:2077
Comment 9 errata-xmlrpc 2017-08-02 07:55:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1842 https://access.redhat.com/errata/RHSA-2017:1842
Comment 10 errata-xmlrpc 2017-09-06 20:41:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:2669 https://access.redhat.com/errata/RHSA-2017:2669
Comment 11 errata-xmlrpc 2018-06-19 04:49:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2018:1854 https://access.redhat.com/errata/RHSA-2018:1854
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