CVE-2017-12190

CVE Details

Release Date:	2018-07-30
Impact:	None	What is this?

Description

The bio_map_user_iov and bio_unmap_user functions in block/bio.c in theLinux kernel before 4.13.8 do unbalanced refcounting when a SCSI I/O vector has small consecutive buffers belonging to the same page. The bio_add_pc_page function merges them into one, but the page reference is never dropped. This causes a memory leak and possible system lockup (exploitable against the host OS by a guest OS user, if a SCSI disk is passed through to a virtual machine) due to an out-of-memory condition.

See more information about CVE-2017-12190 from MITRE CVE dictionary and NIST NVD

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

CVSS v2 metrics

Base Score:	4.9
Vector String:	AV:L/AC:L/Au:N/C:N/I:N/A:C
Version:	2.0
Attack Vector:	Local
Attack Complexity:	Low
Authentication:	None
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	Complete

Errata information

Platform	Errata	Release Date
Oracle Linux version 5 (kernel-uek)	ELSA-2017-3658	2017-12-08
Oracle Linux version 6 (dtrace-modules-3.8.13-118.20.1.el6uek)	ELSA-2017-3657	2017-12-07
Oracle Linux version 6 (kernel)	ELSA-2018-1854	2018-06-25
Oracle Linux version 6 (kernel-uek)	ELSA-2017-3651	2017-12-07
Oracle Linux version 6 (kernel-uek)	ELSA-2017-3657	2017-12-07
Oracle Linux version 6 (kernel-uek)	ELSA-2017-3658	2017-12-08
Oracle Linux version 7 (dtrace-modules-3.8.13-118.20.1.el7uek)	ELSA-2017-3657	2017-12-07
Oracle Linux version 7 (kernel)	ELSA-2018-1062	2018-04-16
Oracle Linux version 7 (kernel-uek)	ELSA-2017-3651	2017-12-07
Oracle Linux version 7 (kernel-uek)	ELSA-2017-3657	2017-12-07
Oracle VM version 3.3 (kernel-uek)	OVMSA-2017-0173	2017-12-08
Oracle VM version 3.4 (kernel-uek)	OVMSA-2017-0172	2017-12-07