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ubuntucveUbuntu.comUB:CVE-2018-18397
HistoryDec 12, 2018 - 12:00 a.m.

CVE-2018-18397

2018-12-1200:00:00
ubuntu.com
ubuntu.com
13

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

2.1 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.0004 Low

EPSS

Percentile

8.6%

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles
access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing
local users to write data into holes in a tmpfs file (if the user has
read-only access to that file, and that file contains holes), related to
fs/userfaultfd.c and mm/userfaultfd.c.

Bugs

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux-aws<Β 4.15.0-1033.35UNKNOWN
ubuntu18.10noarchlinux-aws<Β 4.18.0-1011.13UNKNOWN
ubuntu16.04noarchlinux-aws-hwe<Β 4.15.0-1033.35~16.04.1UNKNOWN
ubuntu18.04noarchlinux-azure<Β 4.18.0-1013.13~18.04.1UNKNOWN
ubuntu18.10noarchlinux-azure<Β 4.18.0-1013.13UNKNOWN
ubuntu14.04noarchlinux-azure<Β 4.15.0-1040.44~14.04.1UNKNOWN
ubuntu16.04noarchlinux-azure<Β 4.15.0-1040.44UNKNOWN
ubuntu18.04noarchlinux<Β 4.15.0-46.49UNKNOWN
ubuntu18.10noarchlinux<Β 4.18.0-16.17UNKNOWN
ubuntu18.04noarchlinux-azure-edge<Β 4.18.0-1013.13~18.04.1UNKNOWN
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1-10 of 261

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

2.1 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.0004 Low

EPSS

Percentile

8.6%