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Resource Exhaustion Affecting kernel-uek package, versions <0:3.8.13-118.20.1.el7uek

Severity

 Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.06% (31st percentile)

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  • Snyk IDSNYK-ORACLE7-KERNELUEK-2520620
  • published10 Apr 2022
  • disclosed22 Nov 2017
Report a new vulnerability Found a mistake?

Introduced: 22 Nov 2017

CVE-2017-12190  (opens in a new tab)
CWE-400  (opens in a new tab)

How to fix?

Upgrade Oracle:7 kernel-uek to version 0:3.8.13-118.20.1.el7uek or higher.
This issue was patched in ELSA-2017-3657.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-uek package and not the kernel-uek package as distributed by Oracle. See How to fix? for Oracle:7 relevant fixed versions and status.

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.

References