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Bug 1444493 - (CVE-2017-7889) CVE-2017-7889 kernel: mm subsystem does not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism
CVE-2017-7889 kernel: mm subsystem does not properly enforce the CONFIG_STRIC...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
: ---
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Assigned To: Red Hat Product Security
impact=moderate,public=20170405,repor...
: Security
Depends On: 1449678 1444496 1449676 1449677 1449679
Blocks: 1444498
  Show dependency tree / graph
 
Reported: 2017-04-21 08:48 EDT by Adam Mariš
Modified: 2018-08-28 18:15 EDT (History)
31 users (show)

See Also:
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.
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Clone Of:
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Last Closed:
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1842 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2017-08-01 14:22:09 EDT
Red Hat Product Errata RHSA-2017:2077 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2017-08-01 14:13:37 EDT
Red Hat Product Errata RHSA-2017:2669 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2017-09-06 20:36:52 EDT
Red Hat Product Errata RHSA-2018:1854 None None None 2018-06-19 00:49 EDT

  None (edit)
Description Adam Mariš 2017-04-21 08:48:33 EDT 
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 08:53:08 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1444496]
Comment 3 Vladis Dronov 2017-05-10 08:24:28 EDT 
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 15:15:31 EDT 
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 03:55:39 EDT 
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 16:41:23 EDT 
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 00:49:20 EDT 
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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