CVE-2018-18445

Published: 17 October 2018

In the Linux kernel 4.14.x, 4.15.x, 4.16.x, 4.17.x, and 4.18.x before 4.18.13, faulty computation of numeric bounds in the BPF verifier permits out-of-bounds memory accesses because adjust_scalar_min_max_vals in kernel/bpf/verifier.c mishandles 32-bit right shifts.

From the Ubuntu Security Team

It was discovered that the BPF verifier in the Linux kernel did not correctly compute numeric bounds in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Priority

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-43.46)
	cosmic	Released (4.18.0-12.13)
	precise	Not vulnerable (3.0.0-12.20)
	trusty	Not vulnerable (3.11.0-12.19)
	upstream	Released (4.19~rc7)
	xenial	Not vulnerable (4.2.0-16.19)
	Patches: Introduced by 468f6eafa6c44cb2c5d8aad35e12f06c240a812a Fixed by b799207e1e1816b09e7a5920fbb2d5fcf6edd681
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1031.33)
	cosmic	Released (4.18.0-1006.7)
	precise	Does not exist
	trusty	Not vulnerable (4.4.0-1002.2)
	upstream	Released (4.19~rc7)
	xenial	Not vulnerable (4.4.0-1001.10)
linux-aws-hwe Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-1031.33~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1036.38)
	cosmic	Released (4.18.0-1006.6)
	precise	Does not exist
	trusty	Released (4.15.0-1036.38~14.04.2)
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-1036.38~16.04.1)
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1036.38)
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-1036.38~16.04.1)
linux-euclid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Not vulnerable (4.4.0-9019.20)
linux-flo Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc7)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1026.27)
	cosmic	Released (4.18.0-1004.5)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-1026.27~16.04.1)
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.18.0-1004.5~18.04.1)
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-gke Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Ignored (end-of-life)
linux-goldfish Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc7)
	xenial	Ignored (end-of-life)
linux-grouper Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.18.0-13.14~18.04.1)
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-43.46~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-8.9~18.04.1)
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-43.46~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1028.28)
	cosmic	Released (4.18.0-1005.5)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Not vulnerable (4.4.0-1004.9)
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Not vulnerable (3.13.0-24.46~precise1)
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [out of standard support])
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [out of standard support])
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [out of standard support])
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Not vulnerable (4.4.0-13.29~14.04.1)
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc7)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1030.35)
	cosmic	Released (4.15.0-1030.35)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Ignored (was needs-triage now end-of-life)
linux-oracle Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1007.9)
	cosmic	Not vulnerable
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Not vulnerable (4.15.0-1007.9~16.04.1)
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1030.32)
	cosmic	Released (4.18.0-1007.9)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Not vulnerable (4.2.0-1013.19)
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Not vulnerable
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Not vulnerable (4.4.0-1012.12)

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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