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

Synopsis:          Important: kernel-alt security and bug fix update
Advisory ID:       RHSA-2019:0831-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2019:0831
Issue date:        2019-04-23
CVE Names:         CVE-2018-13053 CVE-2018-13094 CVE-2018-14734
                   CVE-2018-17972 CVE-2018-18281 CVE-2018-18386
                   CVE-2018-18397 CVE-2019-9213
====================================================================
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: 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: use-after-free in ucma_leave_multicast in
drivers/infiniband/core/ucma.c (CVE-2018-14734)

* kernel: Unprivileged users able to inspect kernel stacks of arbitrary
tasks (CVE-2018-17972)

* kernel: TLB flush happens too late on mremap (CVE-2018-18281)

* kernel: Type confusion in drivers/tty/n_tty.c allows for a denial of
service (CVE-2018-18386)

* kernel: userfaultfd bypasses tmpfs file permissions (CVE-2018-18397)

* kernel: Integer overflow in the alarm_timer_nsleep function
(CVE-2018-13053)

* kernel: NULL pointer dereference in xfs_da_shrink_inode function
(CVE-2018-13094)

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):

* Failed to boot with ftrace=function in kvm with 2vcpu (BZ#1501024)

* [ALT-7.5][x86_64] perf test 63 - inet_pton fails on x86_64 (BZ#1518836)

* BUG: potential out-of-bounds string access when forcing a SELinux label
on a file (BZ#1595706)

* stack out-of-bounds in smb{2,3}_create_lease_buf() on SMB2/SMB3 mounts
(BZ#1598757)

* [ALT-7.6][KVM][PANIC] ltp/lite proc01 - Unable to handle kernel paging
request at virtual address ffff7fe000200018 (BZ#1623193)

* Kernel lock up due to read/write lock (BZ#1636261)

* [RHEL-ALT] Fix potential Spectre v1 in tty code (BZ#1639679)

* [Huawei AArch64 7.6 Bug] HNS3: Vlan on HNS3 NIC cannot communicate
(BZ#1639713)

* [RHEL7.6-ALT][AWS] backport "nvme: update timeout module parameter type"
(BZ#1654958)

* ignore STABLE_FLAG of rmap_item->address in rmap_walk_ksm (BZ#1663565)

* RHEL-Alt-7.6 - kernel: zcrypt: fix specification exception on z196 at ap
probe (BZ#1670018)

* [Huawei AArch64 7.6 Bug] Flock over NFSv3 failed (BZ#1670650)

* [Huawei AArch64 7.6/7.6-z Bug] HNS3: if a single transmit packet(skb) has
more than 8 frags, will cause the NIC to be unavailable (BZ#1677643)

* krb5{,i,p} doesn't work with older enctypes on aarch64 (BZ#1678922)

Users of kernel are advised to upgrade to these updated packages, which fix
these bugs.

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/):

1597747 - CVE-2018-13053 kernel: Integer overflow in the alarm_timer_nsleep function
1597771 - CVE-2018-13094 kernel: NULL pointer dereference in xfs_da_shrink_inode function
1611005 - CVE-2018-14734 kernel: use-after-free in ucma_leave_multicast in drivers/infiniband/core/ucma.c
1636349 - CVE-2018-17972 kernel: Unprivileged users able to inspect kernel stacks of arbitrary tasks
1640598 - CVE-2018-18386 kernel: Type confusion in drivers/tty/n_tty.c allows for a denial of service
1641548 - CVE-2018-18397 kernel: userfaultfd bypasses tmpfs file permissions
1645121 - CVE-2018-18281 kernel: TLB flush happens too late on mremap
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

6. Package List:

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

Source:
kernel-alt-4.14.0-115.7.1.el7a.src.rpm

aarch64:
kernel-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-debug-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-debug-debuginfo-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-debug-devel-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-debuginfo-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-devel-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-headers-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-tools-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-tools-debuginfo-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-tools-libs-4.14.0-115.7.1.el7a.aarch64.rpm
perf-4.14.0-115.7.1.el7a.aarch64.rpm
perf-debuginfo-4.14.0-115.7.1.el7a.aarch64.rpm
python-perf-4.14.0-115.7.1.el7a.aarch64.rpm
python-perf-debuginfo-4.14.0-115.7.1.el7a.aarch64.rpm

noarch:
kernel-abi-whitelists-4.14.0-115.7.1.el7a.noarch.rpm
kernel-doc-4.14.0-115.7.1.el7a.noarch.rpm

ppc64le:
kernel-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-bootwrapper-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-debug-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-debug-debuginfo-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-debuginfo-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-devel-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-headers-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-tools-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-tools-libs-4.14.0-115.7.1.el7a.ppc64le.rpm
perf-4.14.0-115.7.1.el7a.ppc64le.rpm
perf-debuginfo-4.14.0-115.7.1.el7a.ppc64le.rpm
python-perf-4.14.0-115.7.1.el7a.ppc64le.rpm
python-perf-debuginfo-4.14.0-115.7.1.el7a.ppc64le.rpm

s390x:
kernel-4.14.0-115.7.1.el7a.s390x.rpm
kernel-debug-4.14.0-115.7.1.el7a.s390x.rpm
kernel-debug-debuginfo-4.14.0-115.7.1.el7a.s390x.rpm
kernel-debug-devel-4.14.0-115.7.1.el7a.s390x.rpm
kernel-debuginfo-4.14.0-115.7.1.el7a.s390x.rpm
kernel-debuginfo-common-s390x-4.14.0-115.7.1.el7a.s390x.rpm
kernel-devel-4.14.0-115.7.1.el7a.s390x.rpm
kernel-headers-4.14.0-115.7.1.el7a.s390x.rpm
kernel-kdump-4.14.0-115.7.1.el7a.s390x.rpm
kernel-kdump-debuginfo-4.14.0-115.7.1.el7a.s390x.rpm
kernel-kdump-devel-4.14.0-115.7.1.el7a.s390x.rpm
perf-4.14.0-115.7.1.el7a.s390x.rpm
perf-debuginfo-4.14.0-115.7.1.el7a.s390x.rpm
python-perf-4.14.0-115.7.1.el7a.s390x.rpm
python-perf-debuginfo-4.14.0-115.7.1.el7a.s390x.rpm

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

aarch64:
kernel-debug-debuginfo-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-debuginfo-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-tools-debuginfo-4.14.0-115.7.1.el7a.aarch64.rpm
kernel-tools-libs-devel-4.14.0-115.7.1.el7a.aarch64.rpm
perf-debuginfo-4.14.0-115.7.1.el7a.aarch64.rpm
python-perf-debuginfo-4.14.0-115.7.1.el7a.aarch64.rpm

noarch:
kernel-doc-4.14.0-115.7.1.el7a.noarch.rpm

ppc64le:
kernel-debug-debuginfo-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-debug-devel-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-debuginfo-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.14.0-115.7.1.el7a.ppc64le.rpm
kernel-tools-libs-devel-4.14.0-115.7.1.el7a.ppc64le.rpm
perf-debuginfo-4.14.0-115.7.1.el7a.ppc64le.rpm
python-perf-debuginfo-4.14.0-115.7.1.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-2018-13053
https://access.redhat.com/security/cve/CVE-2018-13094
https://access.redhat.com/security/cve/CVE-2018-14734
https://access.redhat.com/security/cve/CVE-2018-17972
https://access.redhat.com/security/cve/CVE-2018-18281
https://access.redhat.com/security/cve/CVE-2018-18386
https://access.redhat.com/security/cve/CVE-2018-18397
https://access.redhat.com/security/cve/CVE-2019-9213
https://access.redhat.com/security/updates/classification/#important

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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