Upstream information

CVE-2017-12190 at MITRE

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.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having moderate severity.

CVSS v2 Scores
  National Vulnerability Database SUSE
Base Score 4.9 5
Vector AV:L/AC:L/Au:N/C:N/I:N/A:C AV:A/AC:L/Au:M/C:N/I:N/A:C
Access Vector Local Adjacent Network
Access Complexity Low Low
Authentication None Multiple
Confidentiality Impact None None
Integrity Impact None None
Availability Impact Complete Complete
CVSS v3 Scores
  SUSE
Base Score 6.2
Vector AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
Access Vector Adjacent Network
Access Complexity Low
Privileges Required High
User Interaction None
Scope Changed
Confidentiality Impact None
Integrity Impact None
Availability Impact High
SUSE Bugzilla entry: 1062568 [NEW]

No SUSE Security Announcements cross referenced.


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.

Product(s) Source package State
SUSE Linux Enterprise Desktop 12 SP2 kernel-source Affected
SUSE Linux Enterprise Desktop 12 SP3 kernel-source Affected
SUSE Linux Enterprise Server 11 SP3 LTSS kernel-source Affected
SUSE Linux Enterprise Server 11 SP4 kernel-source Affected
SUSE Linux Enterprise Server 12 GA LTSS kernel-source Affected
SUSE Linux Enterprise Server 12 SP1 LTSS kernel-source Affected
SUSE Linux Enterprise Server 12 SP2 kernel-source Affected
SUSE Linux Enterprise Server 12 SP3 kernel-source Affected