CVE-2018-1130

Published: 10 May 2018

Linux kernel before version 4.16-rc7 is vulnerable to a null pointer dereference in dccp_write_xmit() function in net/dccp/output.c in that allows a local user to cause a denial of service by a number of certain crafted system calls.

From the Ubuntu Security Team

It was discovered that a null pointer dereference vulnerability existed in the DCCP protocol implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash).

Notes

Author	Note
sbeattie	Introduced in fix for CVE-2017-8824

Mitigation

Blacklist the dccp ipv[46] autoloading aliases by adding the following
lines to /etc/modprobe.d/blacklist-dccp.conf:
  alias net-pf-2-proto-0-type-6 off
  alias net-pf-2-proto-33-type-6 off
  alias net-pf-10-proto-0-type-6 off
  alias net-pf-10-proto-33-type-6 off

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	artful	Released (4.13.0-46.51)
	bionic	Not vulnerable (4.15.0-15.16)
	precise	Ignored (was needed ESM criteria)
	trusty	Released (3.13.0-153.203)
	upstream	Released (4.16~rc7)
	xenial	Released (4.4.0-127.153)
	Patches: Introduced by 69c64866ce072dea1d1e59a0d61e0f66c0dffb76 Fixed by 67f93df79aeefc3add4e4b31a752600f834236e2
linux-aws Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.15.0-1003.3)
	precise	Does not exist
	trusty	Released (4.4.0-1022.22)
	upstream	Released (4.16~rc7)
	xenial	Released (4.4.0-1060.69)
linux-azure Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.15.0-1004.4)
	precise	Does not exist
	trusty	Not vulnerable (4.15.0-1023.24~14.04.1)
	upstream	Released (4.16~rc7)
	xenial	Released (4.15.0-1013.13~16.04.2)
linux-euclid Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Ignored (was needed ESM criteria)
linux-flo Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.16~rc7)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.15.0-1003.3)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Released (4.15.0-1014.14~16.04.1)
linux-gke Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Ignored (was needs-triage now end-of-life)
linux-goldfish Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.16~rc7)
	xenial	Ignored (was needs-triage now end-of-life)
linux-grouper Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.16~rc7)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Released (4.15.0-24.26~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.18.0-8.9~18.04.1)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Released (4.15.0-24.26~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.15.0-1004.4)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Released (4.4.0-1026.31)
linux-lts-trusty Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	Released (3.13.0-153.203~precise1)
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [out of standard support])
	upstream	Released (4.16~rc7)
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [out of standard support])
	upstream	Released (4.16~rc7)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [out of standard support])
	upstream	Released (4.16~rc7)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	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
	precise	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
	precise	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
	precise	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)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Released (4.13.0-1031.35)
linux-raspi2 Launchpad, Ubuntu, Debian	artful	Released (4.13.0-1023.24)
	bionic	Not vulnerable (4.15.0-1006.7)
	precise	Does not exist
	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
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc7)
	xenial	Released (4.4.0-1093.98)

Severity score breakdown

Parameter	Value
Base score	5.5
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

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