Vulnerability CVE-2017-7889
Published: 2017-04-16   Modified: 2017-04-17

Description:
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.

Type:

CWE-732

CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Linux -> Linux kernel 

 References:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a4866aa812518ed1a37d8ea0c881dc946409de94
http://www.debian.org/security/2017/dsa-3945
http://www.openwall.com/lists/oss-security/2017/04/16/4
http://www.securityfocus.com/bid/97690
https://access.redhat.com/errata/RHSA-2017:1842
https://access.redhat.com/errata/RHSA-2017:2077
https://access.redhat.com/errata/RHSA-2017:2669
https://access.redhat.com/errata/RHSA-2018:1854
https://github.com/torvalds/linux/commit/a4866aa812518ed1a37d8ea0c881dc946409de94
https://usn.ubuntu.com/3583-1/
https://usn.ubuntu.com/3583-2/
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