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Amazon Linux AMI: CVE-2017-12190: Security patch for kernel (ALAS-2017-925)

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Amazon Linux AMI: CVE-2017-12190: Security patch for kernel (ALAS-2017-925)

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:C)
Published
11/18/2017
Created
07/25/2018
Added
11/21/2017
Modified
06/21/2018

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.

Solution(s)

  • amazon-linux-upgrade-kernel

References

  • amazon-linux-upgrade-kernel

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