CVE-2018-1094

Published: 1 April 2018

The ext4_fill_super function in fs/ext4/super.c in the Linux kernel through 4.15.15 does not always initialize the crc32c checksum driver, which allows attackers to cause a denial of service (ext4_xattr_inode_hash NULL pointer dereference and system crash) via a crafted ext4 image.

From the Ubuntu Security Team

Wen Xu discovered that the ext4 filesystem implementation in the Linux kernel did not properly initialize the crc32c checksum driver. A local attacker could use this to cause a denial of service (system crash).

Notes

Author	Note
tyhicks	When backporting a45403b, note this upstream bug comment: https://bugzilla.kernel.org/show_bug.cgi?id=199183#c7

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	artful	Ignored (end of life)
	bionic	Released (4.15.0-24.26)
	cosmic	Not vulnerable (4.15.0-29.31)
	trusty	Not vulnerable (3.11.0-12.19)
	upstream	Released (4.17~rc1)
	xenial	Not vulnerable (4.2.0-16.19)
	Patches: Introduced by dec214d00e0d78a08b947d7dccdfdb84407a9f4d Fixed by a45403b51582a87872927a3e0fc0a389c26867f1
linux-aws Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1011.11)
	cosmic	Not vulnerable (4.15.0-1011.11)
	trusty	Not vulnerable (4.4.0-1002.2)
	upstream	Released (4.17~rc1)
	xenial	Not vulnerable (4.4.0-1001.10)
linux-aws-hwe Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Not vulnerable (4.15.0-1030.31~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1014.14)
	cosmic	Not vulnerable (4.15.0-1014.14)
	trusty	Not vulnerable (4.15.0-1023.24~14.04.1)
	upstream	Released (4.17~rc1)
	xenial	Released (4.15.0-1014.14~16.04.1)
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1014.14)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Released (4.15.0-1014.14~16.04.1)
linux-euclid Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Ignored (was needs-triage ESM criteria)
linux-flo Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.17~rc1)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1010.10)
	cosmic	Not vulnerable (4.15.0-1010.10)
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Released (4.15.0-1014.14~16.04.1)
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.18.0-1004.5~18.04.1)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Does not exist
linux-gke Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Ignored (end of standard support, was needed)
linux-goldfish Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.17~rc1)
	xenial	Ignored (end of life, was needed)
linux-grouper Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.17~rc1)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.18.0-13.14~18.04.1)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Released (4.15.0-24.26~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.18.0-12.13~18.04.1)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Released (4.15.0-24.26~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1012.12)
	cosmic	Not vulnerable (4.15.0-1012.12)
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Not vulnerable (4.4.0-1004.9)
linux-lts-trusty Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	upstream	Released (4.17~rc1)
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	upstream	Released (4.17~rc1)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	upstream	Released (4.17~rc1)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Not vulnerable (4.4.0-13.29~14.04.1)
	upstream	Released (4.17~rc1)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.17~rc1)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.17~rc1)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.17~rc1)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1009.12)
	cosmic	Not vulnerable (4.15.0-1009.12)
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Ignored (end of standard support, was needed)
linux-oracle Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1007.9)
	cosmic	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Not vulnerable (4.15.0-1007.9~16.04.1)
linux-raspi2 Launchpad, Ubuntu, Debian	artful	Ignored (end of life)
	bionic	Released (4.15.0-1013.14)
	cosmic	Not vulnerable (4.15.0-1021.23)
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Not vulnerable (4.2.0-1013.19)
linux-snapdragon Launchpad, Ubuntu, Debian	artful	Ignored (end of life)
	bionic	Not vulnerable
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.17~rc1)
	xenial	Not vulnerable (4.4.0-1012.12)

Severity score breakdown

Parameter	Value
Base score	5.5
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

Bugs

https://bugzilla.kernel.org/show_bug.cgi?id=199183

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