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Ubuntu: (Multiple Advisories) (CVE-2017-12190): Linux kernel (Trusty HWE) vulnerabilities

Severity CVSS Published Added Modified
5 (AV:L/AC:L/Au:N/C:N/I:N/A:C) November 18, 2017 November 21, 2017 April 25, 2018

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.

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References

Solution

ubuntu-upgrade-linux-image-3-13-0-142-generic

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