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

Synopsis:          Important: kernel-rt security, bug fix, and enhancement update
Advisory ID:       RHSA-2018:0676-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:0676
Issue date:        2018-04-10
CVE Names:         CVE-2016-3672 CVE-2016-7913 CVE-2016-8633 
                   CVE-2017-7294 CVE-2017-8824 CVE-2017-9725 
                   CVE-2017-12154 CVE-2017-12190 CVE-2017-13166 
                   CVE-2017-14140 CVE-2017-15116 CVE-2017-15121 
                   CVE-2017-15126 CVE-2017-15127 CVE-2017-15129 
                   CVE-2017-15265 CVE-2017-17053 CVE-2017-17448 
                   CVE-2017-17449 CVE-2017-17558 CVE-2017-18017 
                   CVE-2017-18203 CVE-2017-1000252 CVE-2017-1000407 
                   CVE-2017-1000410 CVE-2018-5750 CVE-2018-6927 
                   CVE-2018-1000004 
====================================================================
1. Summary:

An update for kernel-rt 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 Real Time (v. 7) - noarch, x86_64
Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64

3. Description:

The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* kernel: Buffer overflow in firewire driver via crafted incoming packets
(CVE-2016-8633, Important)

* kernel: Use-after-free vulnerability in DCCP socket (CVE-2017-8824,
Important)

* Kernel: kvm: nVMX: L2 guest could access hardware(L0) CR8 register
(CVE-2017-12154, Important)

* kernel: v4l2: disabled memory access protection mechanism allowing
privilege escalation (CVE-2017-13166, Important)

* kernel: media: use-after-free in [tuner-xc2028] media driver
(CVE-2016-7913, Moderate)

* kernel: drm/vmwgfx: fix integer overflow in vmw_surface_define_ioctl()
(CVE-2017-7294, Moderate)

* kernel: Incorrect type conversion for size during dma allocation
(CVE-2017-9725, Moderate)

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

* kernel: vfs: BUG in truncate_inode_pages_range() and fuse client
(CVE-2017-15121, Moderate)

* kernel: Use-after-free in userfaultfd_event_wait_completion function in
userfaultfd.c (CVE-2017-15126, Moderate)

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

* kernel: Use-after-free in snd_seq_ioctl_create_port() (CVE-2017-15265,
Moderate)

* kernel: Incorrect handling in
arch/x86/include/asm/mmu_context.h:init_new_context function allowing
use-after-free (CVE-2017-17053, 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: Unallocated memory access by malicious USB device via
bNumInterfaces overflow (CVE-2017-17558, Moderate)

* kernel: netfilter: use-after-free in tcpmss_mangle_packet function in
net/netfilter/xt_TCPMSS.c (CVE-2017-18017, Moderate)

* kernel: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows
local users to cause a denial of service (CVE-2017-18203, Moderate)

* kernel: kvm: Reachable BUG() on out-of-bounds guest IRQ
(CVE-2017-1000252, Moderate)

* Kernel: KVM: DoS via write flood to I/O port 0x80 (CVE-2017-1000407,
Moderate)

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

* kernel: Kernel address information leak in
drivers/acpi/sbshc.c:acpi_smbus_hc_add() function potentially allowing
KASLR bypass (CVE-2018-5750, Moderate)

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

* kernel: unlimiting the stack disables ASLR (CVE-2016-3672, Low)

* kernel: Missing permission check in move_pages system call
(CVE-2017-14140, Low)

* kernel: Null pointer dereference in rngapi_reset function
(CVE-2017-15116, Low)

* kernel: Improper error handling of VM_SHARED hugetlbfs mapping in
mm/hugetlb.c (CVE-2017-15127, 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 Eyal Itkin for reporting CVE-2016-8633; Mohamed
Ghannam for reporting CVE-2017-8824; Jim Mattson (Google.com) for reporting
CVE-2017-12154; Vitaly Mayatskih for reporting CVE-2017-12190; Andrea
Arcangeli (Engineering) for reporting CVE-2017-15126; Kirill Tkhai for
reporting CVE-2017-15129; Jan H. Schönherr (Amazon) for reporting
CVE-2017-1000252; and Armis Labs for reporting CVE-2017-1000410. The
CVE-2017-15121 issue was discovered by Miklos Szeredi (Red Hat) and the
CVE-2017-15116 issue was discovered by ChunYu Wang (Red Hat).

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/):

1292927 - rcuc starvation leads to rcu stall
1324749 - CVE-2016-3672 kernel: unlimiting the stack disables ASLR
1391490 - CVE-2016-8633 kernel: Buffer overflow in firewire driver via crafted incoming packets
1401061 - RFE: Improve RT throttling mechanism
1402885 - CVE-2016-7913 kernel: media: use-after-free in [tuner-xc2028] media driver
1430418 - Backport "net/Qdisc: use a seqlock instead seqcount" upstream RT patch
1436798 - CVE-2017-7294 kernel: drm/vmwgfx: fix integer overflow in vmw_surface_define_ioctl()
1448770 - INFO: task xfsaild/dm-2:1175 blocked for more than 600 seconds
1452589 - Review our frequency scaling setup/tuning
1462329 - RT: update source tree to match RHEL 7.5 tree
1488329 - CVE-2017-14140 kernel: Missing permission check in move_pages system call
1489088 - CVE-2017-9725 kernel: Incorrect type conversion for size during dma allocation
1490781 - CVE-2017-1000252 kernel: kvm: Reachable BUG() on out-of-bounds guest IRQ
1491224 - CVE-2017-12154 Kernel: kvm: nVMX: L2 guest could access hardware(L0) CR8 register
1495089 - CVE-2017-12190 kernel: memory leak when merging buffers in SCSI IO vectors1500894 - sched/rt: Simplify the IPI rt  balancing  logic
1501878 - CVE-2017-15265 kernel: Use-after-free in snd_seq_ioctl_create_port()
1503749 - RT + Omnipath panic
1506255 - mm: print warning when ksmd thread runs with CONFIG_PREEMPT_RT enabled
1507270 - BUG: scheduling while atomic: irq/41-megasas/562/0x00000002
1509264 - [RHEL-RT] Possible regression with NOHZ_FULL & rt_mutexes in IRQ (BZ1250649)
1514609 - CVE-2017-15116 kernel: Null pointer dereference in rngapi_reset function
1518274 - backport: c4ccd6b1ce locking/rtmutex: Prevent dequeue vs. unlock race
1518638 - CVE-2017-17053 kernel: Incorrect handling in arch/x86/include/asm/mmu_context.h:init_new_context function allowing use-after-free
1519160 - CVE-2017-1000410 kernel: Stack information leak in the EFS element
1519591 - CVE-2017-8824 kernel: Use-after-free vulnerability in DCCP socket
1520328 - CVE-2017-1000407 Kernel: KVM: DoS via write flood to I/O port 0x80
1520893 - CVE-2017-15121 kernel: vfs: BUG in truncate_inode_pages_range() and fuse client
1523481 - CVE-2017-15126 kernel: Use-after-free in userfaultfd_event_wait_completion function in userfaultfd.c
1525218 - CVE-2017-15127 kernel: Improper error handling of VM_SHARED hugetlbfs mapping in mm/hugetlb.c
1525474 - CVE-2017-17558 kernel: Unallocated memory access by malicious USB device via bNumInterfaces overflow
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
1531135 - CVE-2017-18017 kernel: netfilter: use-after-free in tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c
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
1539706 - CVE-2018-5750 kernel: Kernel address information leak in drivers/acpi/sbshc.c:acpi_smbus_hc_add() function potentially allowing KASLR bypass
1544612 - CVE-2018-6927 kernel: Integer overflow in futex.c:futux_requeue can lead to denial of service or unspecified impact
1548412 - CVE-2017-13166 kernel: v4l2: disabled memory access protection mechanism allowing privilege escalation
1550811 - CVE-2017-18203 kernel: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows local users to cause a denial of service

6. Package List:

Red Hat Enterprise Linux for Real Time for NFV (v. 7):

Source:
kernel-rt-3.10.0-862.rt56.804.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-862.rt56.804.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-debug-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-devel-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-trace-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-862.rt56.804.el7.x86_64.rpm

Red Hat Enterprise Linux for Real Time (v. 7):

Source:
kernel-rt-3.10.0-862.rt56.804.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-862.rt56.804.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-debug-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-devel-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-trace-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-862.rt56.804.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-862.rt56.804.el7.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-2016-3672
https://access.redhat.com/security/cve/CVE-2016-7913
https://access.redhat.com/security/cve/CVE-2016-8633
https://access.redhat.com/security/cve/CVE-2017-7294
https://access.redhat.com/security/cve/CVE-2017-8824
https://access.redhat.com/security/cve/CVE-2017-9725
https://access.redhat.com/security/cve/CVE-2017-12154
https://access.redhat.com/security/cve/CVE-2017-12190
https://access.redhat.com/security/cve/CVE-2017-13166
https://access.redhat.com/security/cve/CVE-2017-14140
https://access.redhat.com/security/cve/CVE-2017-15116
https://access.redhat.com/security/cve/CVE-2017-15121
https://access.redhat.com/security/cve/CVE-2017-15126
https://access.redhat.com/security/cve/CVE-2017-15127
https://access.redhat.com/security/cve/CVE-2017-15129
https://access.redhat.com/security/cve/CVE-2017-15265
https://access.redhat.com/security/cve/CVE-2017-17053
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-2017-17558
https://access.redhat.com/security/cve/CVE-2017-18017
https://access.redhat.com/security/cve/CVE-2017-18203
https://access.redhat.com/security/cve/CVE-2017-1000252
https://access.redhat.com/security/cve/CVE-2017-1000407
https://access.redhat.com/security/cve/CVE-2017-1000410
https://access.redhat.com/security/cve/CVE-2018-5750
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 . More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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