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Vulnerable Software

Vulnerability Details CVE-2017-12190

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 27.1%
CVSS Severity
CVSS v3 Score 6.5
CVSS v2 Score 4.9
References
Products affected by CVE-2017-12190


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