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Ubuntu: USN-3487-1 (CVE-2017-12190): Linux kernel vulnerabilities

Severity CVSS Published Added Modified
4 (AV:L/AC:M/Au:N/C:P/I:P/A:P) November 17, 2017 November 20, 2017 November 23, 2017

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-4-13-0-1006-raspi2

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