CVE-2017-18344

CVE Details

Release Date:	2018-07-26
Impact:	Important	What is this?

Description

The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel before 4.14.8 doesn't properly validate the sigevent->sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc//timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).

See more information about CVE-2017-18344 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	5.5
Vector String:	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Version:	3.0
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	High
Integrity Impact:	None
Availability Impact:	None

Errata information

Platform	Errata	Release Date
Oracle Linux version 5 (kernel-uek)	ELSA-2018-4214	2018-09-13
Oracle Linux version 6 (dtrace-modules-3.8.13-118.24.1.el6uek)	ELSA-2018-4211	2018-09-10
Oracle Linux version 6 (kernel-uek)	ELSA-2018-4196	2018-08-14
Oracle Linux version 6 (kernel-uek)	ELSA-2018-4211	2018-09-10
Oracle Linux version 6 (kernel-uek)	ELSA-2018-4214	2018-09-13
Oracle Linux version 7 (dtrace-modules-3.8.13-118.24.1.el7uek)	ELSA-2018-4211	2018-09-10
Oracle Linux version 7 (kernel)	ELSA-2018-3083	2018-11-05
Oracle Linux version 7 (kernel-uek)	ELSA-2018-4196	2018-08-14
Oracle Linux version 7 (kernel-uek)	ELSA-2018-4211	2018-09-10
Oracle VM version 3.4 (kernel-uek)	OVMSA-2018-0247	2018-08-14