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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel Cache Invalidation Bug Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1042160
SecurityTracker URL:  http://securitytracker.com/id/1042160
CVE Reference:   CVE-2018-17182   (Links to External Site)
Date:  Nov 27 2018
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 7
Description:   A vulnerability was reported in the Linux kernel. A local user can obtain elevated privileges on the target system.

A local user can run a specially crafted application to trigger an overflow in the cache invalidation optimization and execute arbitrary code on the target system with elevated privileges.

The original advisory is available at:

https://bugs.chromium.org/p/project-zero/issues/detail?id=1664

Additional information is available at:

https://googleprojectzero.blogspot.com/2018/09/a-cache-invalidation-bug-in-linux.html

Jann Horn of Google Project Zero reported this vulnerability.

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:3656

Vendor URL:  access.redhat.com/errata/RHSA-2018:3656 (Links to External Site)
Cause:   Boundary error

Message History:   This archive entry is a follow-up to the message listed below.
Oct 1 2018 Linux Kernel Cache Invalidation Bug Lets Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2018:3656-01] Important: kernel-alt security and bug fix update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel-alt security and bug fix update
Advisory ID:       RHSA-2018:3656-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:3656
Issue date:        2018-11-26
CVE Names:         CVE-2018-17182 CVE-2018-18021 
=====================================================================

1. Summary:

An update for kernel-alt is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, noarch, ppc64le, s390x
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, noarch, ppc64le

3. Description:

The kernel-alt packages provide the Linux kernel version 4.x.

Security Fix(es):

* kernel: Use-after-free in the vmacache_flush_all function resulting in a
possible privilege escalation (CVE-2018-17182)

* kernel: Privilege escalation on arm64 via KVM hypervisor (CVE-2018-18021)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Bug Fix(es):

These updated kernel packages include also numerous bug fixes. Space
precludes documenting all of the bug fixes in this advisory. See the
descriptions in the related Knowledge Article:
https://access.redhat.com/articles/3714391

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1631205 - CVE-2018-17182 kernel: Use-after-free in the vmacache_flush_all function resulting in a possible privilege escalation
1635475 - CVE-2018-18021 kernel: Privilege escalation on arm64 via KVM hypervisor

6. Package List:

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):

Source:
kernel-alt-4.14.0-115.2.2.el7a.src.rpm

aarch64:
kernel-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-debug-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-debug-debuginfo-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-debug-devel-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-debuginfo-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-devel-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-headers-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-tools-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-tools-debuginfo-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-tools-libs-4.14.0-115.2.2.el7a.aarch64.rpm
perf-4.14.0-115.2.2.el7a.aarch64.rpm
perf-debuginfo-4.14.0-115.2.2.el7a.aarch64.rpm
python-perf-4.14.0-115.2.2.el7a.aarch64.rpm
python-perf-debuginfo-4.14.0-115.2.2.el7a.aarch64.rpm

noarch:
kernel-abi-whitelists-4.14.0-115.2.2.el7a.noarch.rpm
kernel-doc-4.14.0-115.2.2.el7a.noarch.rpm

ppc64le:
kernel-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-bootwrapper-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-debug-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-debug-debuginfo-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-debuginfo-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-devel-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-headers-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-tools-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-tools-libs-4.14.0-115.2.2.el7a.ppc64le.rpm
perf-4.14.0-115.2.2.el7a.ppc64le.rpm
perf-debuginfo-4.14.0-115.2.2.el7a.ppc64le.rpm
python-perf-4.14.0-115.2.2.el7a.ppc64le.rpm
python-perf-debuginfo-4.14.0-115.2.2.el7a.ppc64le.rpm

s390x:
kernel-4.14.0-115.2.2.el7a.s390x.rpm
kernel-debug-4.14.0-115.2.2.el7a.s390x.rpm
kernel-debug-debuginfo-4.14.0-115.2.2.el7a.s390x.rpm
kernel-debug-devel-4.14.0-115.2.2.el7a.s390x.rpm
kernel-debuginfo-4.14.0-115.2.2.el7a.s390x.rpm
kernel-debuginfo-common-s390x-4.14.0-115.2.2.el7a.s390x.rpm
kernel-devel-4.14.0-115.2.2.el7a.s390x.rpm
kernel-headers-4.14.0-115.2.2.el7a.s390x.rpm
kernel-kdump-4.14.0-115.2.2.el7a.s390x.rpm
kernel-kdump-debuginfo-4.14.0-115.2.2.el7a.s390x.rpm
kernel-kdump-devel-4.14.0-115.2.2.el7a.s390x.rpm
perf-4.14.0-115.2.2.el7a.s390x.rpm
perf-debuginfo-4.14.0-115.2.2.el7a.s390x.rpm
python-perf-4.14.0-115.2.2.el7a.s390x.rpm
python-perf-debuginfo-4.14.0-115.2.2.el7a.s390x.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):

aarch64:
kernel-debug-debuginfo-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-debuginfo-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-tools-debuginfo-4.14.0-115.2.2.el7a.aarch64.rpm
kernel-tools-libs-devel-4.14.0-115.2.2.el7a.aarch64.rpm
perf-debuginfo-4.14.0-115.2.2.el7a.aarch64.rpm
python-perf-debuginfo-4.14.0-115.2.2.el7a.aarch64.rpm

noarch:
kernel-doc-4.14.0-115.2.2.el7a.noarch.rpm

ppc64le:
kernel-debug-debuginfo-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-debug-devel-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-debuginfo-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.14.0-115.2.2.el7a.ppc64le.rpm
kernel-tools-libs-devel-4.14.0-115.2.2.el7a.ppc64le.rpm
perf-debuginfo-4.14.0-115.2.2.el7a.ppc64le.rpm
python-perf-debuginfo-4.14.0-115.2.2.el7a.ppc64le.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2018-17182
https://access.redhat.com/security/cve/CVE-2018-18021
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/articles/3714391

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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