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Red Hat: CVE-2017-12190: Important: kernel-alt security, bug fix, and enhancement update (Multiple Advisories)

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Red Hat: CVE-2017-12190: Important: kernel-alt security, bug fix, and enhancement update (Multiple Advisories)

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:C)
Published
11/18/2017
Created
07/25/2018
Added
04/11/2018
Modified
02/14/2023

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)

  • redhat-upgrade-kernel
  • redhat-upgrade-kernel-rt

References

  • 101911
  • CVE-2017-12190
  • RHSA-2018:0654
  • RHSA-2018:0676
  • RHSA-2018:1062
  • RHSA-2018:1854
  • RHSA-2019:1170
  • RHSA-2019:1190
  • USN-3487-1
  • USN-3582-1
  • USN-3582-2
  • USN-3583-1
  • USN-3583-2
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