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

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2019:1479-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2019:1479
Issue date:        2019-06-17
CVE Names:         CVE-2019-9213 CVE-2019-11477 CVE-2019-11478
                   CVE-2019-11479
====================================================================
1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 8.

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 CodeReady Linux Builder (v. 8) - aarch64, ppc64le, x86_64
Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, noarch, ppc64le, s390x, x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security Fix(es):

* An integer overflow flaw was found in the way the Linux kernel's
networking subsystem processed TCP Selective Acknowledgment (SACK)
segments. While processing SACK segments, the Linux kernel's socket buffer
(SKB) data structure becomes fragmented. Each fragment is about TCP maximum
segment size (MSS) bytes. To efficiently process SACK blocks, the Linux
kernel merges multiple fragmented SKBs into one, potentially overflowing
the variable holding the number of segments. A remote attacker could use
this flaw to crash the Linux kernel by sending a crafted sequence of SACK
segments on a TCP connection with small value of TCP MSS, resulting in a
denial of service (DoS). (CVE-2019-11477)

* kernel: lack of check for mmap minimum address in expand_downwards in
mm/mmap.c leads to NULL pointer dereferences exploit on non-SMAP platforms
(CVE-2019-9213)

* Kernel: tcp: excessive resource consumption while processing SACK blocks
allows remote denial of service (CVE-2019-11478)

* Kernel: tcp: excessive resource consumption for TCP connections with low
MSS allows remote denial of service (CVE-2019-11479)

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

Bug Fix(es):

* [HPE 8.0 Bug] nvme drive power button does not turn off drive
(BZ#1700288)

* RHEL8.0 - hw csum failure seen in dmesg and console (using
mlx5/mlx4/Mellanox) (BZ#1700289)

* RHEL8.0 - vfio-ap: add subsystem to matrix device to avoid libudev
failures (kvm) (BZ#1700290)

* [FJ8.1 Bug]: Make Fujitsu Erratum 010001 patch work on A64FX v1r0
(BZ#1700901)

* [FJ8.0 Bug]: Fujitsu A64FX processor errata - panic by unknown fault
(BZ#1700902)

* RHEL 8.0 Snapshot 4 - nvme create-ns command hangs after creating 20
namespaces on Bolt (NVMe) (BZ#1701140)

* [Cavium/Marvell 8.0 qed] Fix qed_mcp_halt() and qed_mcp_resume()
(backporting bug) (BZ#1704184)

* [Intel 8.1 Bug] PBF: Base frequency display fix (BZ#1706739)

* [RHEL8]read/write operation not permitted to /sys/kernel/debug/gcov/reset
(BZ#1708100)

* RHEL8.0 - ISST-LTE:pVM:fleetwood:LPM:raylp85:After lpm seeing the
console logs on the the lpar at  target side (BZ#1708102)

* RHEL8.0 - Backport support for software count cache flush Spectre v2
mitigation (BZ#1708112)

* [Regression] RHEL8.0 - System crashed with one stress-ng-mremap stressor
on Boston (kvm host) (BZ#1708617)

* [intel ice Rhel 8 RC1] ethtool -A ethx causes interfaces to go down
(BZ#1709433)

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/):

1686136 - CVE-2019-9213 kernel: lack of check for mmap minimum address in expand_downwards in mm/mmap.c leads to NULL pointer dereferences exploit on non-SMAP platforms
1719123 - CVE-2019-11477 Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service
1719128 - CVE-2019-11478 Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service
1719129 - CVE-2019-11479 Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service

6. Package List:

Red Hat Enterprise Linux BaseOS (v. 8):

Source:
kernel-4.18.0-80.4.2.el8_0.src.rpm

aarch64:
bpftool-4.18.0-80.4.2.el8_0.aarch64.rpm
bpftool-debuginfo-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-core-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-cross-headers-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-debug-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-debug-core-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-debug-debuginfo-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-debug-devel-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-debug-modules-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-debug-modules-extra-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-debuginfo-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-debuginfo-common-aarch64-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-devel-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-headers-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-modules-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-modules-extra-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-tools-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-tools-debuginfo-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-tools-libs-4.18.0-80.4.2.el8_0.aarch64.rpm
perf-4.18.0-80.4.2.el8_0.aarch64.rpm
perf-debuginfo-4.18.0-80.4.2.el8_0.aarch64.rpm
python3-perf-4.18.0-80.4.2.el8_0.aarch64.rpm
python3-perf-debuginfo-4.18.0-80.4.2.el8_0.aarch64.rpm

noarch:
kernel-abi-whitelists-4.18.0-80.4.2.el8_0.noarch.rpm
kernel-doc-4.18.0-80.4.2.el8_0.noarch.rpm

ppc64le:
bpftool-4.18.0-80.4.2.el8_0.ppc64le.rpm
bpftool-debuginfo-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-core-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-cross-headers-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-debug-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-debug-core-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-debug-debuginfo-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-debug-devel-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-debug-modules-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-debug-modules-extra-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-debuginfo-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-devel-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-headers-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-modules-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-modules-extra-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-tools-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-tools-debuginfo-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-tools-libs-4.18.0-80.4.2.el8_0.ppc64le.rpm
perf-4.18.0-80.4.2.el8_0.ppc64le.rpm
perf-debuginfo-4.18.0-80.4.2.el8_0.ppc64le.rpm
python3-perf-4.18.0-80.4.2.el8_0.ppc64le.rpm
python3-perf-debuginfo-4.18.0-80.4.2.el8_0.ppc64le.rpm

s390x:
bpftool-4.18.0-80.4.2.el8_0.s390x.rpm
bpftool-debuginfo-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-core-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-cross-headers-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-debug-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-debug-core-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-debug-debuginfo-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-debug-devel-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-debug-modules-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-debug-modules-extra-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-debuginfo-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-debuginfo-common-s390x-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-devel-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-headers-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-modules-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-modules-extra-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-tools-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-tools-debuginfo-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-zfcpdump-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-zfcpdump-core-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-zfcpdump-debuginfo-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-zfcpdump-devel-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-zfcpdump-modules-4.18.0-80.4.2.el8_0.s390x.rpm
kernel-zfcpdump-modules-extra-4.18.0-80.4.2.el8_0.s390x.rpm
perf-4.18.0-80.4.2.el8_0.s390x.rpm
perf-debuginfo-4.18.0-80.4.2.el8_0.s390x.rpm
python3-perf-4.18.0-80.4.2.el8_0.s390x.rpm
python3-perf-debuginfo-4.18.0-80.4.2.el8_0.s390x.rpm

x86_64:
bpftool-4.18.0-80.4.2.el8_0.x86_64.rpm
bpftool-debuginfo-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-core-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-cross-headers-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-debug-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-debug-core-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-debug-debuginfo-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-debug-devel-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-debug-modules-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-debug-modules-extra-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-debuginfo-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-debuginfo-common-x86_64-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-devel-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-headers-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-modules-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-modules-extra-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-tools-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-tools-debuginfo-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-tools-libs-4.18.0-80.4.2.el8_0.x86_64.rpm
perf-4.18.0-80.4.2.el8_0.x86_64.rpm
perf-debuginfo-4.18.0-80.4.2.el8_0.x86_64.rpm
python3-perf-4.18.0-80.4.2.el8_0.x86_64.rpm
python3-perf-debuginfo-4.18.0-80.4.2.el8_0.x86_64.rpm

Red Hat CodeReady Linux Builder (v. 8):

aarch64:
bpftool-debuginfo-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-debug-debuginfo-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-debuginfo-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-debuginfo-common-aarch64-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-tools-debuginfo-4.18.0-80.4.2.el8_0.aarch64.rpm
kernel-tools-libs-devel-4.18.0-80.4.2.el8_0.aarch64.rpm
perf-debuginfo-4.18.0-80.4.2.el8_0.aarch64.rpm
python3-perf-debuginfo-4.18.0-80.4.2.el8_0.aarch64.rpm

ppc64le:
bpftool-debuginfo-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-debug-debuginfo-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-debuginfo-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-tools-debuginfo-4.18.0-80.4.2.el8_0.ppc64le.rpm
kernel-tools-libs-devel-4.18.0-80.4.2.el8_0.ppc64le.rpm
perf-debuginfo-4.18.0-80.4.2.el8_0.ppc64le.rpm
python3-perf-debuginfo-4.18.0-80.4.2.el8_0.ppc64le.rpm

x86_64:
bpftool-debuginfo-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-debug-debuginfo-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-debuginfo-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-debuginfo-common-x86_64-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-tools-debuginfo-4.18.0-80.4.2.el8_0.x86_64.rpm
kernel-tools-libs-devel-4.18.0-80.4.2.el8_0.x86_64.rpm
perf-debuginfo-4.18.0-80.4.2.el8_0.x86_64.rpm
python3-perf-debuginfo-4.18.0-80.4.2.el8_0.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-2019-9213
https://access.redhat.com/security/cve/CVE-2019-11477
https://access.redhat.com/security/cve/CVE-2019-11478
https://access.redhat.com/security/cve/CVE-2019-11479
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/tcpsack

8. Contact:

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

Copyright 2019 Red Hat, Inc.
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