CVE-2017-12190

 

Published at: - 22-11-2017 07:29

Last modified: - 26-10-2022 01:44

Total changes: - 3

Description

The bio_map_user_iov and bio_unmap_user functions in block/bio.c in the Linux 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.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://github.com/torvalds/linux/commit/95d78c28b5a85bacbc29b8dba7c04babb9b0d467
• https://github.com/torvalds/linux/commit/2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058
• https://bugzilla.redhat.com/show_bug.cgi?id=1495089
• http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.8
• http://seclists.org/oss-sec/2017/q4/52
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=95d78c28b5a85bacbc29b8dba7c04babb9b0d467
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058
• 101911-Issue Tracking, Third Party Advisory, VDB Entry
• [debian-lts-announce] 20171210 [SECURITY] [DLA 1200-1] linux security update-
• USN-3583-2-
• USN-3583-1-
• USN-3582-2-
• USN-3582-1-
• RHSA-2018:0654-
• RHSA-2018:1062-
• RHSA-2018:0676-
• RHSA-2018:1854-
• RHSA-2019:1170-
• RHSA-2019:1190-
• https://support.f5.com/csp/article/K93472064?utm_source=f5support&utm_medium=RSS

 

Keywords

NVD

 

CVE-2017-12190

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures