CVE-2017-7889

Published: 16 April 2017

The mm subsystem in the Linux kernel through 3.2 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.

From the Ubuntu Security Team

Tommi Rantala and Brad Spengler discovered that the memory manager in the Linux kernel did not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism. A local attacker with access to /dev/mem could use this to expose sensitive information or possibly execute arbitrary code.

Notes

Author	Note
jdstrand	android kernels (flo, goldfish, grouper, maguro, mako and manta) are not supported on the Ubuntu Touch 14.10 and earlier preview kernels linux-lts-saucy no longer receives official support linux-lts-quantal no longer receives official support

Author

Note

jdstrand

android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support

Priority

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Not vulnerable (4.10.0-22.24)
	precise	Ignored (end of life)
	trusty	Released (3.13.0-142.191)
	xenial	Released (4.4.0-79.100)
	yakkety	Ignored (end of life)
	zesty	Released (4.10.0-22.24)
	Patches: Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Fixed by a4866aa812518ed1a37d8ea0c881dc946409de94
linux-armadaxp Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-flo Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	xenial	Ignored (abandoned)
	yakkety	Ignored (end of life)
	zesty	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	xenial	Ignored (abandoned)
	yakkety	Ignored (end of life)
	zesty	Ignored (end of life)
linux-grouper Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-linaro-omap Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-linaro-shared Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-linaro-vexpress Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-quantal Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-raring Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-saucy Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Ignored (end of life, was needed)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-mako Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	xenial	Ignored (abandoned)
	yakkety	Ignored (end of life)
	zesty	Does not exist
linux-manta Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-qcm-msm Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Not vulnerable (4.10.0-1006.8)
	precise	Does not exist
	trusty	Does not exist
	xenial	Released (4.4.0-1057.64)
	yakkety	Ignored (end of life)
	zesty	Released (4.10.0-1006.8)
linux-ti-omap4 Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-aws Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Not vulnerable (4.4.0-1002.2)
	xenial	Released (4.4.0-1018.27)
	yakkety	Does not exist
	zesty	Does not exist
linux-azure Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	trusty	Not vulnerable (4.15.0-1023.24~14.04.1)
	xenial	Not vulnerable (4.11.0-1009.9)
	yakkety	Does not exist
	zesty	Does not exist
linux-euclid Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	trusty	Does not exist
	xenial	Ignored (was needed ESM criteria)
	zesty	Does not exist
linux-gcp Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	trusty	Does not exist
	xenial	Not vulnerable (4.10.0-1004.4)
	yakkety	Does not exist
	zesty	Does not exist
linux-gke Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist
	xenial	Released (4.4.0-1014.14)
	yakkety	Does not exist
	zesty	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist
	xenial	Released (4.10.0-27.30~16.04.2)
	yakkety	Does not exist
	zesty	Does not exist
linux-hwe-edge Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist
	xenial	Released (4.10.0-27.30~16.04.2)
	yakkety	Does not exist
	zesty	Does not exist
linux-kvm Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	trusty	Does not exist
	xenial	Not vulnerable (4.4.0-1004.9)
	zesty	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	precise	Does not exist
	trusty	Released (4.4.0-79.100~14.04.1)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-oem Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Does not exist
	trusty	Does not exist
	xenial	Not vulnerable (4.13.0-1008.9)
	zesty	Does not exist
linux-snapdragon Launchpad, Ubuntu, Debian	upstream	Released (4.11~rc7)
	artful	Not vulnerable (4.4.0-1059.63)
	precise	Does not exist
	trusty	Does not exist
	xenial	Released (4.4.0-1059.63)
	yakkety	Released (4.4.0-1059.63)
	zesty	Released (4.4.0-1059.63)

Severity score breakdown

Parameter	Value
Base score	7.8
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

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