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LIN7-9197 : Security Advisory - linux - CVE-2017-12190

Created: Nov 30, 2017    Updated: Sep 8, 2018
Resolved Date: Jan 17, 2018
Found In Version: 7.0.0.26
Fix Version: 7.0.0.28
Severity: Standard
Applicable for: Wind River Linux 7
Component/s: Kernel

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.

https://nvd.nist.gov/vuln/detail/CVE-2017-12190

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