CVE-2018-8781

Published: 23 April 2018

The udl_fb_mmap function in drivers/gpu/drm/udl/udl_fb.c at the Linux kernel version 3.4 and up to and including 4.15 has an integer-overflow vulnerability allowing local users with access to the udldrmfb driver to obtain full read and write permissions on kernel physical pages, resulting in a code execution in kernel space.

From the Ubuntu Security Team

Eyal Itkin discovered that the USB displaylink video adapter driver in the Linux kernel did not properly validate mmap offsets sent from userspace. A local attacker could use this to expose sensitive information (kernel memory) or possibly execute arbitrary code.

Priority

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-15.16)
	upstream	Released (4.16~rc7)
	artful	Released (4.13.0-45.50)
	trusty	Released (3.13.0-151.201)
	xenial	Released (4.4.0-127.153)
	Patches: Introduced by 5320918b9a87865223fd6b228e530bf30bc64d9d Fixed by 3b82a4db8eaccce735dffd50b4d4e1578099b8e8
linux-flo Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.16~rc7)
	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Ignored (abandoned)
linux-goldfish Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.16~rc7)
	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Ignored (end of life, was needs-triage)
linux-grouper Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.16~rc7)
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Does not exist
	artful	Does not exist
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.16~rc7)
	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.16~rc7)
	artful	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.16~rc7)
	artful	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.16~rc7)
	artful	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	xenial	Does not exist
linux-aws Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1003.3)
	upstream	Released (4.16~rc7)
	artful	Does not exist
	trusty	Released (4.4.0-1022.22)
	xenial	Released (4.4.0-1060.69)
linux-azure Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1004.4)
	upstream	Released (4.16~rc7)
	artful	Does not exist
	trusty	Not vulnerable (4.15.0-1023.24~14.04.1)
	xenial	Released (4.15.0-1013.13~16.04.2)
linux-euclid Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.16~rc7)
	artful	Does not exist
	trusty	Does not exist
	xenial	Ignored (was needed ESM criteria)
linux-gcp Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1003.3)
	upstream	Released (4.16~rc7)
	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.13.0-1019.23)
linux-gke Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.16~rc7)
	artful	Does not exist
	trusty	Does not exist
	xenial	Ignored (end of standard support, was needs-triage)
linux-hwe Launchpad, Ubuntu, Debian	bionic	Not vulnerable
	upstream	Released (4.16~rc7)
	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.13.0-45.50~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Released (4.18.0-8.9~18.04.1)
	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Released (4.13.0-45.50~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.15.0-1004.4)
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Released (4.4.0-1026.31)
linux-lts-xenial Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Released (4.4.0-127.153~14.04.1)
	upstream	Released (4.16~rc7)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.16~rc7)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.16~rc7)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.16~rc7)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.15.0-1002.3)
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Released (4.13.0-1030.33)
linux-raspi2 Launchpad, Ubuntu, Debian	artful	Released (4.13.0-1022.23)
	bionic	Not vulnerable (4.15.0-1006.7)
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Released (4.4.0-1090.98)
linux-snapdragon Launchpad, Ubuntu, Debian	artful	Released (4.4.0-1093.98)
	bionic	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Released (4.4.0-1093.98)

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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