Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2017.1890
Important: kernel-rt security, bug fix, and enhancement update
2 August 2017
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel-rt
Publisher: Red Hat
Operating System: Red Hat
Impact/Access: Root Compromise -- Existing Account
Access Privileged Data -- Existing Account
Denial of Service -- Existing Account
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-9242 CVE-2017-9077 CVE-2017-9076
CVE-2017-9075 CVE-2017-9074 CVE-2017-8890
CVE-2017-8797 CVE-2017-7889 CVE-2017-7616
CVE-2017-7187 CVE-2017-6951 CVE-2017-6001
CVE-2017-5970 CVE-2017-2671 CVE-2017-2647
CVE-2017-2596 CVE-2016-10200 CVE-2016-10147
CVE-2016-10088 CVE-2016-9806 CVE-2016-9685
CVE-2016-9604 CVE-2016-9588 CVE-2016-9576
CVE-2016-8645 CVE-2016-7097 CVE-2016-7042
CVE-2016-6213 CVE-2015-8970 CVE-2015-8839
CVE-2014-7975 CVE-2014-7970
Reference: ASB-2017.0032
ASB-2017.0020
ASB-2017.0002
ASB-2016.0089
ESB-2016.2856
ESB-2016.2447
ESB-2016.2159
ESB-2015.0137
Original Bulletin:
https://access.redhat.com/errata/RHSA-2017:2077
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Red Hat Security Advisory
Synopsis: Important: kernel-rt security, bug fix, and enhancement update
Advisory ID: RHSA-2017:2077-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:2077
Issue date: 2017-08-01
CVE Names: CVE-2014-7970 CVE-2014-7975 CVE-2015-8839
CVE-2015-8970 CVE-2016-10088 CVE-2016-10147
CVE-2016-10200 CVE-2016-6213 CVE-2016-7042
CVE-2016-7097 CVE-2016-8645 CVE-2016-9576
CVE-2016-9588 CVE-2016-9604 CVE-2016-9685
CVE-2016-9806 CVE-2017-2596 CVE-2017-2647
CVE-2017-2671 CVE-2017-5970 CVE-2017-6001
CVE-2017-6951 CVE-2017-7187 CVE-2017-7616
CVE-2017-7889 CVE-2017-8797 CVE-2017-8890
CVE-2017-9074 CVE-2017-9075 CVE-2017-9076
CVE-2017-9077 CVE-2017-9242
=====================================================================
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):
* An use-after-free flaw was found in the Linux kernel which enables a race
condition in the L2TPv3 IP Encapsulation feature. A local user could use
this flaw to escalate their privileges or crash the system.
(CVE-2016-10200, Important)
* A flaw was found that can be triggered in keyring_search_iterator in
keyring.c if type->match is NULL. A local user could use this flaw to crash
the system or, potentially, escalate their privileges. (CVE-2017-2647,
Important)
* It was found that the NFSv4 server in the Linux kernel did not properly
validate layout type when processing NFSv4 pNFS LAYOUTGET and GETDEVICEINFO
operands. A remote attacker could use this flaw to soft-lockup the system
and thus cause denial of service. (CVE-2017-8797, Important)
This update also fixes multiple Moderate and Low impact security issues:
* CVE-2015-8839, CVE-2015-8970, CVE-2016-9576, CVE-2016-7042,
CVE-2016-7097, CVE-2016-8645, CVE-2016-9576, CVE-2016-9588, CVE-2016-9806,
CVE-2016-10088, CVE-2016-10147, CVE-2017-2596, CVE-2017-2671,
CVE-2017-5970, CVE-2017-6001, CVE-2017-6951, CVE-2017-7187, CVE-2017-7616,
CVE-2017-7889, CVE-2017-8890, CVE-2017-9074, CVE-2017-8890, CVE-2017-9075,
CVE-2017-8890, CVE-2017-9076, CVE-2017-8890, CVE-2017-9077, CVE-2017-9242,
CVE-2014-7970, CVE-2014-7975, CVE-2016-6213, CVE-2016-9604, CVE-2016-9685
Documentation for these issues is available from the Release Notes document
linked from the References section.
Red Hat would like to thank Igor Redko (Virtuozzo) and Andrey Ryabinin
(Virtuozzo) for reporting CVE-2017-2647; Igor Redko (Virtuozzo) and Vasily
Averin (Virtuozzo) for reporting CVE-2015-8970; Marco Grassi for reporting
CVE-2016-8645; and Dmitry Vyukov (Google Inc.) for reporting CVE-2017-2596.
The CVE-2016-7042 issue was discovered by Ondrej Kozina (Red Hat); the
CVE-2016-7097 issue was discovered by Andreas Gruenbacher (Red Hat) and Jan
Kara (SUSE); the CVE-2016-6213 and CVE-2016-9685 issues were discovered by
Qian Cai (Red Hat); and the CVE-2016-9604 issue was discovered by David
Howells (Red Hat).
Additional Changes:
For detailed information on other changes in this release, see the Red Hat
Enterprise Linux 7.4 Release Notes linked from the References section.
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/):
1151095 - CVE-2014-7970 Kernel: fs: VFS denial of service
1151108 - CVE-2014-7975 Kernel: fs: umount denial of service
1323577 - CVE-2015-8839 kernel: ext4 filesystem page fault race condition with fallocate call.
1356471 - CVE-2016-6213 kernel: Overflowing kernel mount table using shared bind mount
1368938 - CVE-2016-7097 kernel: Setting a POSIX ACL via setxattr doesn't clear the setgid bit
1373966 - CVE-2016-7042 kernel: Stack corruption while reading /proc/keys when gcc stack protector is enabled
1377840 - kernel-rt: update to the RHEL7.3.z batch#1 source tree
1378172 - KVM-RT: halting and starting guests cause latency spikes
1386286 - CVE-2015-8970 kernel: crypto: GPF in lrw_crypt caused by null-deref
1389215 - RT kernel panics with dm-multipath enabled
1389433 - CVE-2016-9604 kernel: security: The built-in keyrings for security tokens can be joined as a session and then modified by the root user
1393904 - CVE-2016-8645 kernel: a BUG() statement can be hit in net/ipv4/tcp_input.c
1396941 - CVE-2016-9685 kernel: Memory leaks in xfs_attr_list.c error paths
1400188 - kernel-rt: update to the RHEL7.3.z batch#2 source tree
1401502 - CVE-2016-9806 kernel: netlink: double-free in netlink_dump
1403145 - CVE-2016-9576 kernel: Use after free in SCSI generic device interface
1404200 - CVE-2016-10147 kernel: Kernel crash by spawning mcrypt(alg) with incompatible algorithm
1404924 - CVE-2016-9588 Kernel: kvm: nVMX: uncaught software exceptions in L1 guest leads to DoS
1412210 - CVE-2016-10088 kernel: Use after free in SCSI generic device interface (CVE-2016-9576 regression)
1414052 - kernel-rt: update to the RHEL7.3.z batch#3 source tree
1417812 - CVE-2017-2596 Kernel: kvm: page reference leakage in handle_vmon
1421638 - CVE-2017-5970 kernel: ipv4: Invalid IP options could cause skb->dst drop
1421801 - [rt] update driver modifications from upstream PREEMPT_RT patchset
1421810 - [rt] implement the simple work queue from upstream PREEMPT_RT series
1422825 - CVE-2017-6001 kernel: Race condition between multiple sys_perf_event_open() calls
1425780 - latencyhist: disable jump-labels
1426661 - BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:915
1427626 - [rt] x86_64 specific updates from upstream PREEMPT_RT patchset
1427647 - [rt] dump stack: don't disable preemption during trace
1427991 - lockdep: selftest: fix warnings due to missing PREEMPT_RT conditionals
1428353 - CVE-2017-2647 kernel: Null pointer dereference in search_keyring
1428890 - update softirq: Check preemption after reenabling interrupts
1428943 - Consider backport "ftrace: Fix trace header alignment"
1429610 - kernel-rt: update to the RHEL7.3.z batch#4 source tree
1429640 - [rt] ipc/msg: Implement lockless pipelined wakeups
1429951 - [rt] fs: dcache: Use cpu_chill() in trylock loops
1429977 - workqueue: use rcu_readlock() in put_pwq_unlocked()
1430023 - snd/pcm: fix snd_pcm_stream_lock*() irqs_disabled() splats
1430038 - Add missing hunk for upstream skbufhead-raw-lock RT patches
1430074 - Backport "net: dev: always take qdisc's busylock in __dev_xmit_skb" upstream RT patch
1430347 - CVE-2016-10200 kernel: l2tp: Race condition in the L2TPv3 IP encapsulation feature
1430353 - net: add back the missing serialization in ip_send_unicast_reply()
1430926 - percpu_ida: Use local locks
1430946 - sas-ata/isci: dont't disable interrupts in qc_issue handler
1431104 - cpu hotplug: Document why PREEMPT_RT uses a spinlock
1432118 - hotplug: Use set_cpus_allowed_ptr() in sync_unplug_thread()
1433252 - CVE-2017-6951 kernel: NULL pointer dereference in keyring_search_aux function
1434327 - CVE-2017-7187 kernel: scsi: Stack-based buffer overflow in sg_ioctl function
1434616 - CPU hotplug causes lglock to be taken from atomic context
1436649 - CVE-2017-2671 kernel: ping socket / AF_LLC connect() sin_family race
1438512 - [rt] pull patchset that lifts single reader restriction on rwsems
1441088 - CVE-2017-7616 kernel: Incorrect error handling in the set_mempolicy and mbind compat syscalls in mm/mempolicy.c
1441552 - kernel BUG at kernel/sched/rt.c:2021!
1444493 - CVE-2017-7889 kernel: mm subsystem does not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism
1450972 - CVE-2017-8890 kernel: Double free in the inet_csk_clone_lock function in net/ipv4/inet_connection_sock.c
1452240 - kvmgt.ko needs unknown symbol
1452679 - CVE-2017-9074 kernel: net: IPv6 fragmentation implementation of nexthdr field may be associated with an invalid option
1452688 - CVE-2017-9076 kernel: net: IPv6 DCCP implementation mishandles inheritance
1452691 - CVE-2017-9075 kernel: net: sctp_v6_create_accept_sk function mishandles inheritance
1452744 - CVE-2017-9077 kernel: net: tcp_v6_syn_recv_sock function mishandles inheritance
1456388 - CVE-2017-9242 kernel: Incorrect overwrite check in __ip6_append_data()
1459056 - Boot/Shutdown RT guest with kernel-rt-debug will cause "BUG: sleeping function called from invalid context at kernel/rtmutex.c:818"
1466329 - CVE-2017-8797 kernel: NFSv4 server does not properly validate layout type when processing NFSv4 pNFS LAYOUTGET operand
6. Package List:
Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source:
kernel-rt-3.10.0-693.rt56.617.el7.src.rpm
noarch:
kernel-rt-doc-3.10.0-693.rt56.617.el7.noarch.rpm
x86_64:
kernel-rt-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-debug-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-devel-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-trace-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-693.rt56.617.el7.x86_64.rpm
Red Hat Enterprise Linux for Real Time (v. 7):
Source:
kernel-rt-3.10.0-693.rt56.617.el7.src.rpm
noarch:
kernel-rt-doc-3.10.0-693.rt56.617.el7.noarch.rpm
x86_64:
kernel-rt-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-debug-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-devel-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-trace-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-693.rt56.617.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-693.rt56.617.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-2014-7970
https://access.redhat.com/security/cve/CVE-2014-7975
https://access.redhat.com/security/cve/CVE-2015-8839
https://access.redhat.com/security/cve/CVE-2015-8970
https://access.redhat.com/security/cve/CVE-2016-10088
https://access.redhat.com/security/cve/CVE-2016-10147
https://access.redhat.com/security/cve/CVE-2016-10200
https://access.redhat.com/security/cve/CVE-2016-6213
https://access.redhat.com/security/cve/CVE-2016-7042
https://access.redhat.com/security/cve/CVE-2016-7097
https://access.redhat.com/security/cve/CVE-2016-8645
https://access.redhat.com/security/cve/CVE-2016-9576
https://access.redhat.com/security/cve/CVE-2016-9588
https://access.redhat.com/security/cve/CVE-2016-9604
https://access.redhat.com/security/cve/CVE-2016-9685
https://access.redhat.com/security/cve/CVE-2016-9806
https://access.redhat.com/security/cve/CVE-2017-2596
https://access.redhat.com/security/cve/CVE-2017-2647
https://access.redhat.com/security/cve/CVE-2017-2671
https://access.redhat.com/security/cve/CVE-2017-5970
https://access.redhat.com/security/cve/CVE-2017-6001
https://access.redhat.com/security/cve/CVE-2017-6951
https://access.redhat.com/security/cve/CVE-2017-7187
https://access.redhat.com/security/cve/CVE-2017-7616
https://access.redhat.com/security/cve/CVE-2017-7889
https://access.redhat.com/security/cve/CVE-2017-8797
https://access.redhat.com/security/cve/CVE-2017-8890
https://access.redhat.com/security/cve/CVE-2017-9074
https://access.redhat.com/security/cve/CVE-2017-9075
https://access.redhat.com/security/cve/CVE-2017-9076
https://access.redhat.com/security/cve/CVE-2017-9077
https://access.redhat.com/security/cve/CVE-2017-9242
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.4_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/
Copyright 2017 Red Hat, Inc.
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