PT-2017-12394 · Linux+5 · Linux Kernel+5
Vitaly Mayatskikh
·
Published
2017-10-12
·
Updated
2023-02-12
·
CVE-2017-12190
CVSS v3.1
6.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 4.13.8
Description
The issue is related to unbalanced refcounting in the Linux kernel when handling SCSI I/O vectors with small consecutive buffers belonging to the same page. This occurs because the
bio add pc page function merges these buffers into one, but the page reference is never dropped, leading to a memory leak. The memory leak can cause a system lockup due to an out-of-memory condition, which can be exploited by a guest OS user against the host OS if a SCSI disk is passed through to a virtual machine.Recommendations
For Linux kernel versions prior to 4.13.8, update to version 4.13.8 or later to resolve the issue. As a temporary workaround, consider restricting the use of SCSI disks in virtual machines to minimize the risk of exploitation.
Fix
Missing Release of Resource after Effective Lifetime
Resource Exhaustion
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Related Identifiers
Affected Products
Alt Linux
Centos
Linux Kernel
Red Hat
Suse
Ubuntu