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Red Hat Security Advisory

Synopsis: Important: kernel-alt security, bug fix, and enhancement update
Advisory ID: RHSA-2018:0654-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:0654
Issue date: 2018-04-10
CVE Names: CVE-2017-11473 CVE-2017-12190 CVE-2017-15129
CVE-2017-15299 CVE-2017-17448 CVE-2017-17449
CVE-2017-1000255 CVE-2017-1000410 CVE-2018-6927
CVE-2018-1000004
=====================================================================

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, x86_64
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) – aarch64, noarch, ppc64le, x86_64

3. Description:

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

The following packages have been upgraded to a later upstream version:
kernel-alt (4.14.0). (BZ#1492717)

Security Fix(es):

* An industry-wide issue was found in the way many modern microprocessor
designs have implemented speculative execution of instructions (a commonly
used performance optimization). There are three primary variants of the
issue which differ in the way the speculative execution can be exploited.

Variant CVE-2017-5715 triggers the speculative execution by utilizing
branch target injection. It relies on the presence of a precisely-defined
instruction sequence in the privileged code as well as the fact that memory
accesses may cause allocation into the microprocessor’s data cache even for
speculatively executed instructions that never actually commit (retire). As
a result, an unprivileged attacker could use this flaw to cross the syscall
and guest/host boundaries and read privileged memory by conducting targeted
cache side-channel attacks. (CVE-2017-5715, Important, ARM)

Variant CVE-2017-5753 triggers the speculative execution by performing a
bounds-check bypass. It relies on the presence of a precisely-defined
instruction sequence in the privileged code as well as the fact that memory
accesses may cause allocation into the microprocessor’s data cache even for
speculatively executed instructions that never actually commit (retire). As
a result, an unprivileged attacker could use this flaw to cross the syscall
boundary and read privileged memory by conducting targeted cache
side-channel attacks. (CVE-2017-5753, Important, ARM)

Variant CVE-2017-5754 relies on the fact that, on impacted microprocessors,
during speculative execution of instruction permission faults, exception
generation triggered by a faulting access is suppressed until the
retirement of the whole instruction block. In a combination with the fact
that memory accesses may populate the cache even when the block is being
dropped and never committed (executed), an unprivileged local attacker
could use this flaw to read privileged (kernel space) memory by conducting
targeted cache side-channel attacks. (CVE-2017-5754, Important, ARM)

* kernel: memory leak when merging buffers in SCSI IO vectors
(CVE-2017-12190, Moderate)

* kernel: net: double-free and memory corruption in get_net_ns_by_id()
(CVE-2017-15129, Moderate)

* kernel: Incorrect updates of uninstantiated keys crash the kernel
(CVE-2017-15299, Moderate)

* kernel: Missing capabilities check in net/netfilter/nfnetlink_cthelper.c
allows for unprivileged access to systemwide nfnl_cthelper_list structure
(CVE-2017-17448, Moderate)

* kernel: Missing namespace check in net/netlink/af_netlink.c allows for
network monitors to observe systemwide activity (CVE-2017-17449, Moderate)

* kernel: Arbitrary stack overwrite causing oops via crafted signal frame
(CVE-2017-1000255, Moderate)

* kernel: Stack information leak in the EFS element (CVE-2017-1000410,
Moderate)

* kernel: Race condition in sound system can lead to denial of service
(CVE-2018-1000004, Moderate)

* kernel: Buffer overflow in mp_override_legacy_irq() (CVE-2017-11473, Low)

* kernel: Integer overflow in futex.c:futux_requeue can lead to denial of
service or unspecified impact (CVE-2018-6927, Low)

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.

Red Hat would like to thank Google Project Zero for reporting
CVE-2017-5715, CVE-2017-5753, and CVE-2017-5754; Vitaly Mayatskih for
reporting CVE-2017-12190; Kirill Tkhai for reporting CVE-2017-15129;
Michael Ellerman, Gustavo Romero, Breno Leitao, Paul Mackerras, and Cyril
Bur for reporting CVE-2017-1000255; and Armis Labs for reporting
CVE-2017-1000410.

Additional Changes:

See the Red Hat Enterprise Linux 7.5 Release Notes linked from References.

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/):

1473209 – CVE-2017-11473 kernel: Buffer overflow in mp_override_legacy_irq()
1495089 – CVE-2017-12190 kernel: memory leak when merging buffers in SCSI IO vectors
1498016 – CVE-2017-15299 kernel: Incorrect updates of uninstantiated keys crash the kernel
1498067 – CVE-2017-1000255 kernel: Arbitrary stack overwrite causing oops via crafted signal frame
1501794 – [7.4-ALT]: SEEK_HOLE/SEEK_DATA with a negative file offset test fails
1519160 – CVE-2017-1000410 kernel: Stack information leak in the EFS element
1519778 – CVE-2017-5753 hw: cpu: speculative execution bounds-check bypass
1519780 – CVE-2017-5715 hw: cpu: speculative execution branch target injection
1519781 – CVE-2017-5754 hw: cpu: speculative execution permission faults handling
1525762 – CVE-2017-17449 kernel: Missing namespace check in net/netlink/af_netlink.c allows for network monitors to observe systemwide activity
1525768 – CVE-2017-17448 kernel: Missing capabilities check in net/netfilter/nfnetlink_cthelper.c allows for unprivileged access to systemwide nfnl_cthelper_list structure
1531174 – CVE-2017-15129 kernel: net: double-free and memory corruption in get_net_ns_by_id()
1535315 – CVE-2018-1000004 kernel: Race condition in sound system can lead to denial of service
1544612 – CVE-2018-6927 kernel: Integer overflow in futex.c:futux_requeue can lead to denial of service or unspecified impact

6. Package List:

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

Source:
kernel-alt-4.14.0-49.el7a.src.rpm

aarch64:
kernel-4.14.0-49.el7a.aarch64.rpm
kernel-debug-4.14.0-49.el7a.aarch64.rpm
kernel-debug-debuginfo-4.14.0-49.el7a.aarch64.rpm
kernel-debug-devel-4.14.0-49.el7a.aarch64.rpm
kernel-debuginfo-4.14.0-49.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.14.0-49.el7a.aarch64.rpm
kernel-devel-4.14.0-49.el7a.aarch64.rpm
kernel-headers-4.14.0-49.el7a.aarch64.rpm
kernel-tools-4.14.0-49.el7a.aarch64.rpm
kernel-tools-debuginfo-4.14.0-49.el7a.aarch64.rpm
kernel-tools-libs-4.14.0-49.el7a.aarch64.rpm
perf-4.14.0-49.el7a.aarch64.rpm
perf-debuginfo-4.14.0-49.el7a.aarch64.rpm
python-perf-4.14.0-49.el7a.aarch64.rpm
python-perf-debuginfo-4.14.0-49.el7a.aarch64.rpm

noarch:
kernel-abi-whitelists-4.14.0-49.el7a.noarch.rpm
kernel-doc-4.14.0-49.el7a.noarch.rpm

ppc64le:
kernel-4.14.0-49.el7a.ppc64le.rpm
kernel-bootwrapper-4.14.0-49.el7a.ppc64le.rpm
kernel-debug-4.14.0-49.el7a.ppc64le.rpm
kernel-debug-debuginfo-4.14.0-49.el7a.ppc64le.rpm
kernel-debuginfo-4.14.0-49.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.14.0-49.el7a.ppc64le.rpm
kernel-devel-4.14.0-49.el7a.ppc64le.rpm
kernel-headers-4.14.0-49.el7a.ppc64le.rpm
kernel-tools-4.14.0-49.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.14.0-49.el7a.ppc64le.rpm
kernel-tools-libs-4.14.0-49.el7a.ppc64le.rpm
perf-4.14.0-49.el7a.ppc64le.rpm
perf-debuginfo-4.14.0-49.el7a.ppc64le.rpm
python-perf-4.14.0-49.el7a.ppc64le.rpm
python-perf-debuginfo-4.14.0-49.el7a.ppc64le.rpm

s390x:
kernel-4.14.0-49.el7a.s390x.rpm
kernel-debug-4.14.0-49.el7a.s390x.rpm
kernel-debug-debuginfo-4.14.0-49.el7a.s390x.rpm
kernel-debug-devel-4.14.0-49.el7a.s390x.rpm
kernel-debuginfo-4.14.0-49.el7a.s390x.rpm
kernel-debuginfo-common-s390x-4.14.0-49.el7a.s390x.rpm
kernel-devel-4.14.0-49.el7a.s390x.rpm
kernel-headers-4.14.0-49.el7a.s390x.rpm
kernel-kdump-4.14.0-49.el7a.s390x.rpm
kernel-kdump-debuginfo-4.14.0-49.el7a.s390x.rpm
kernel-kdump-devel-4.14.0-49.el7a.s390x.rpm
perf-4.14.0-49.el7a.s390x.rpm
perf-debuginfo-4.14.0-49.el7a.s390x.rpm
python-perf-4.14.0-49.el7a.s390x.rpm
python-perf-debuginfo-4.14.0-49.el7a.s390x.rpm

x86_64:
kernel-4.14.0-49.el7a.x86_64.rpm
kernel-debug-4.14.0-49.el7a.x86_64.rpm
kernel-debug-debuginfo-4.14.0-49.el7a.x86_64.rpm
kernel-debug-devel-4.14.0-49.el7a.x86_64.rpm
kernel-debuginfo-4.14.0-49.el7a.x86_64.rpm
kernel-debuginfo-common-x86_64-4.14.0-49.el7a.x86_64.rpm
kernel-devel-4.14.0-49.el7a.x86_64.rpm
kernel-headers-4.14.0-49.el7a.x86_64.rpm
kernel-tools-4.14.0-49.el7a.x86_64.rpm
kernel-tools-debuginfo-4.14.0-49.el7a.x86_64.rpm
kernel-tools-libs-4.14.0-49.el7a.x86_64.rpm
perf-4.14.0-49.el7a.x86_64.rpm
perf-debuginfo-4.14.0-49.el7a.x86_64.rpm
python-perf-4.14.0-49.el7a.x86_64.rpm
python-perf-debuginfo-4.14.0-49.el7a.x86_64.rpm

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

aarch64:
kernel-debug-debuginfo-4.14.0-49.el7a.aarch64.rpm
kernel-debuginfo-4.14.0-49.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.14.0-49.el7a.aarch64.rpm
kernel-tools-debuginfo-4.14.0-49.el7a.aarch64.rpm
kernel-tools-libs-devel-4.14.0-49.el7a.aarch64.rpm
perf-debuginfo-4.14.0-49.el7a.aarch64.rpm
python-perf-debuginfo-4.14.0-49.el7a.aarch64.rpm

noarch:
kernel-doc-4.14.0-49.el7a.noarch.rpm

ppc64le:
kernel-debug-debuginfo-4.14.0-49.el7a.ppc64le.rpm
kernel-debug-devel-4.14.0-49.el7a.ppc64le.rpm
kernel-debuginfo-4.14.0-49.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.14.0-49.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.14.0-49.el7a.ppc64le.rpm
kernel-tools-libs-devel-4.14.0-49.el7a.ppc64le.rpm
perf-debuginfo-4.14.0-49.el7a.ppc64le.rpm
python-perf-debuginfo-4.14.0-49.el7a.ppc64le.rpm

x86_64:
kernel-debug-debuginfo-4.14.0-49.el7a.x86_64.rpm
kernel-debuginfo-4.14.0-49.el7a.x86_64.rpm
kernel-debuginfo-common-x86_64-4.14.0-49.el7a.x86_64.rpm
kernel-tools-debuginfo-4.14.0-49.el7a.x86_64.rpm
kernel-tools-libs-devel-4.14.0-49.el7a.x86_64.rpm
perf-debuginfo-4.14.0-49.el7a.x86_64.rpm
python-perf-debuginfo-4.14.0-49.el7a.x86_64.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-2017-11473
https://access.redhat.com/security/cve/CVE-2017-12190
https://access.redhat.com/security/cve/CVE-2017-15129
https://access.redhat.com/security/cve/CVE-2017-15299
https://access.redhat.com/security/cve/CVE-2017-17448
https://access.redhat.com/security/cve/CVE-2017-17449
https://access.redhat.com/security/cve/CVE-2017-1000255
https://access.redhat.com/security/cve/CVE-2017-1000410
https://access.redhat.com/security/cve/CVE-2018-6927
https://access.redhat.com/security/cve/CVE-2018-1000004
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.5_Release_Notes/index.html

8. Contact:

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

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