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RedhatCVE-2017-12190

HistoryNov 22, 2017 - 6:29 p.m.

CVE-2017-12190

2017-11-2218:29:00

CWE-772

CWE-400

redhat

web.nvd.nist.gov

166

linux kernel

cve-2017-12190

bio_map_user_iov

bio_unmap_user

memory leak

system lockup

security vulnerability

nvd

exploit

scsi disk

virtual machine

CVSS2

4.9

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

CVSS3

6.5

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

6.6

Confidence

High

EPSS

0.001

Percentile

28.1%

JSON

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.

Affected configurations

Nvd

Vulners

Node

linuxlinux_kernelRange≤4.13.7

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::

CNA Affected

[
  {
    "product": "Linux kernel through v4.14-rc5",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "Linux kernel through v4.14-rc5"
      }
    ]
  }
]