CVE-2017-12190

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Summary

CVECVE-2017-12190
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-11-22 18:29:00 UTC
Updated2025-04-20 01:37:25 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.0 6.5 MEDIUM from [email protected]

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

EPSS: 0.000760000 probability, percentile 0.226480000 (date 2026-05-14)

Problem Types: CWE-400 | CWE-772 | CWE-400 CWE-400

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary6.5MEDIUMCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
2.0[email protected]Primary4.9AV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS v3.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Linux Kernel Through V4.14-rc5 affected Linux kernel through v4.14-rc5 Not specified

References

ReferenceSourceLinkTags
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
support.f5.com/csp/article/K93472064 af854a3a-2127-422b-91ae-364da2661108 support.f5.com
USN-3583-2: Linux kernel (Trusty HWE) vulnerabilities | Ubuntu security notices af854a3a-2127-422b-91ae-364da2661108 usn.ubuntu.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
USN-3582-2: Linux kernel (Xenial HWE) vulnerabilities | Ubuntu security notices af854a3a-2127-422b-91ae-364da2661108 usn.ubuntu.com
[SECURITY] [DLA 1200-1] linux security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
fix unbalanced page refcounting in bio_map_user_iov · torvalds/linux@95d78c2 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Issue Tracking, Patch, Third Party Advisory
more bio_map_user_iov() leak fixes · torvalds/linux@2b04e8f · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Issue Tracking, Patch, Third Party Advisory
www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.8 af854a3a-2127-422b-91ae-364da2661108 www.kernel.org Issue Tracking, Third Party Advisory
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
kernel/git/torvalds/linux.git - Linux kernel source tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Issue Tracking, Patch, Vendor Advisory
kernel/git/torvalds/linux.git - Linux kernel source tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Issue Tracking, Patch, Vendor Advisory
Linux kernel 'block/bio.c' Multiple Local Information Disclosure Vulnerabilities af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Issue Tracking, Third Party Advisory, VDB Entry
oss-sec: CVE-2017-12190: Linux kernel: block: memory leak when merging small consecutive buffers in SCSI IO vectors af854a3a-2127-422b-91ae-364da2661108 seclists.org Issue Tracking, Mailing List, Third Party Advisory
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Bug 1495089 – CVE-2017-12190 kernel: memory leak when merging buffers in SCSI IO vectors af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Patch, Third Party Advisory
USN-3583-1: Linux kernel vulnerabilities | Ubuntu security notices af854a3a-2127-422b-91ae-364da2661108 usn.ubuntu.com
USN-3582-1: Linux kernel vulnerabilities | Ubuntu security notices af854a3a-2127-422b-91ae-364da2661108 usn.ubuntu.com
CONFIRM:https://support.f5.com/csp/article/K93472064?utm_source=f5support&utm_medium=RSS MITRE support.f5.com
CVE-2017-12190 - Red Hat Customer Portal MITRE access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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