CVE-2017-18241

2018-03-2100:00:00

ubuntu.com

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

4.9 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:N/I:N/A:C

0.0004 Low

EPSS

Percentile

5.3%

JSON

fs/f2fs/segment.c in the Linux kernel before 4.13 allows local users to
cause a denial of service (NULL pointer dereference and panic) by using a
noflush_merge option that triggers a NULL value for a flush_cmd_control
data structure.

Notes

Author	Note
ppisati	fixes a case in the F2FS_FS, when the fs is mounted with the ‘noflush_merge’ option, but support for flush coalition was introduced in: 6b4afdd794783fe515b50838aa36591e3feea990
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

OSVersionArchitecturePackageVersionFilename
ubuntu16.04noarchlinux< 4.4.0-143.169UNKNOWN
ubuntu14.04noarchlinux-aws< 4.4.0-1039.42UNKNOWN
ubuntu16.04noarchlinux-aws< 4.4.0-1077.87UNKNOWN
ubuntu16.04noarchlinux-azure< 4.13.0-1005.7UNKNOWN
ubuntu16.04noarchlinux-gcp< 4.13.0-1002.5UNKNOWN
ubuntu16.04noarchlinux-hwe< 4.13.0-26.29~16.04.2UNKNOWN
ubuntu16.04noarchlinux-hwe-edge< 4.13.0-26.29~16.04.2UNKNOWN
ubuntu16.04noarchlinux-kvm< 4.4.0-1041.47UNKNOWN
ubuntu14.04noarchlinux-lts-xenial< 4.4.0-143.169~14.04.2UNKNOWN
ubuntu16.04noarchlinux-raspi2< 4.4.0-1104.112UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	16.04	noarch	linux	< 4.4.0-143.169	UNKNOWN
ubuntu	14.04	noarch	linux-aws	< 4.4.0-1039.42	UNKNOWN
ubuntu	16.04	noarch	linux-aws	< 4.4.0-1077.87	UNKNOWN
ubuntu	16.04	noarch	linux-azure	< 4.13.0-1005.7	UNKNOWN
ubuntu	16.04	noarch	linux-gcp	< 4.13.0-1002.5	UNKNOWN
ubuntu	16.04	noarch	linux-hwe	< 4.13.0-26.29~16.04.2	UNKNOWN
ubuntu	16.04	noarch	linux-hwe-edge	< 4.13.0-26.29~16.04.2	UNKNOWN
ubuntu	16.04	noarch	linux-kvm	< 4.4.0-1041.47	UNKNOWN
ubuntu	14.04	noarch	linux-lts-xenial	< 4.4.0-143.169~14.04.2	UNKNOWN
ubuntu	16.04	noarch	linux-raspi2	< 4.4.0-1104.112	UNKNOWN