CVE-2018-14615

Published: 27 July 2018

An issue was discovered in the Linux kernel through 4.17.10. There is a buffer overflow in truncate_inline_inode() in fs/f2fs/inline.c when umounting an f2fs image, because a length value may be negative.

From the Ubuntu Security Team

Wen Xu discovered that the f2fs file system implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious f2fs image that, when mounted, could cause a denial of service (system crash).

Notes

Author	Note
sbeattie	f2fs tree fix w/commit "f2fs: fix to do sanity check with i_extra_isize"
tyhicks	The affected user base for this issue is likely small since f2fs is not the default filesystem and it is not widely used in Ubuntu

Author

Note

sbeattie

f2fs tree fix w/commit "f2fs: fix to do sanity check with
i_extra_isize"

tyhicks

The affected user base for this issue is likely small since f2fs is
not the default filesystem and it is not widely used in Ubuntu

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-58.64)
	cosmic	Ignored (end of life)
	disco	Not vulnerable (4.19.0-12.13)
	trusty	Not vulnerable (3.11.0-12.19)
	upstream	Released (4.19~rc1)
	xenial	Not vulnerable (4.2.0-16.19)
	Patches: Introduced by 7a2af766af15887754f7f7a0869b4603b390876a Fixed by 18dd6470c2d14d10f5a2dd926925dc80dbd3abfd
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1047.49)
	cosmic	Ignored (end of life)
	disco	Not vulnerable (5.0.0-1001.1)
	trusty	Not vulnerable (4.4.0-1002.2)
	upstream	Released (4.19~rc1)
	xenial	Not vulnerable (4.4.0-1001.10)
linux-aws-hwe Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-1047.49~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1014.14~18.04.1)
	cosmic	Ignored (end of life)
	disco	Not vulnerable (5.0.0-1001.1)
	trusty	Ignored (was needed ESM criteria)
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-1055.60)
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1014.14~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-1055.60)
linux-euclid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Not vulnerable (4.4.0-9019.20)
linux-flo Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1040.42)
	cosmic	Ignored (end of life)
	disco	Not vulnerable (5.0.0-1001.1)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-1040.42~16.04.1)
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1040.42)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-gke Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Ignored (end of standard support)
linux-gke-4.15 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1040.42)
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-gke-5.0 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-1011.11~18.04.1)
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Ignored (end of life)
linux-grouper Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-23.24~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-58.64~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-15.16~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-58.64~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1042.42)
	cosmic	Ignored (end of life)
	disco	Not vulnerable (5.0.0-1001.1)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Not vulnerable (4.4.0-1004.9)
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Ignored (end of life, was ignored)
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Ignored (end of life, was ignored)
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Ignored (end of life, was ignored)
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Not vulnerable (4.4.0-13.29~14.04.1)
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1050.57)
	cosmic	Ignored (end of life)
	disco	Released (4.15.0-1050.57)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Not vulnerable
linux-oracle Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1021.23)
	cosmic	Ignored (end of life)
	disco	Released (5.0.0-1004.8)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-1021.23~16.04.1)
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1043.46)
	cosmic	Ignored (end of life)
	disco	Not vulnerable (5.0.0-1004.4)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Not vulnerable (4.2.0-1013.19)
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1060.66)
	cosmic	Does not exist
	disco	Not vulnerable (5.0.0-1010.10)
	trusty	Does not exist
	upstream	Released (4.19~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:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

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