Ubuntu: USN-3487-1 (CVE-2017-12190): Linux kernel vulnerabilities
|4||(AV:L/AC:M/Au:N/C:P/I:P/A:P)||November 17, 2017||November 20, 2017||November 23, 2017|
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.
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