Detections
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CVE-2017-12190
medium
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.
References
https://github.com/torvalds/linux/commit/95d78c28b5a85bacbc29b8dba7c04babb9b0d467
https://github.com/torvalds/linux/commit/2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058
https://bugzilla.redhat.com/show_bug.cgi?id=1495089
http://www.securityfocus.com/bid/101911
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.8
https://usn.ubuntu.com/3583-2/
https://usn.ubuntu.com/3583-1/
https://usn.ubuntu.com/3582-2/
https://usn.ubuntu.com/3582-1/
https://support.f5.com/csp/article/K93472064?utm_source=f5support&%3Butm_medium=RSS
https://lists.debian.org/debian-lts-announce/2017/12/msg00004.html
https://access.redhat.com/errata/RHSA-2019:1190
https://access.redhat.com/errata/RHSA-2019:1170
https://access.redhat.com/errata/RHSA-2018:1854
https://access.redhat.com/errata/RHSA-2018:1062
https://access.redhat.com/errata/RHSA-2018:0676