Topic

Updated kernel packages that fix multiple security issues, address several
hundred bugs, and add numerous enhancements are now available as part of
the ongoing support and maintenance of Red Hat Enterprise Linux version 7.
This is the first regular update.

Red Hat Product Security has rated this update as having Important security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

Description

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

• A flaw was found in the way the Linux kernel's XFS file system handled

replacing of remote attributes under certain conditions. A local user with
access to XFS file system mount could potentially use this flaw to escalate
their privileges on the system. (CVE-2015-0274, Important)

• It was found that the Linux kernel's KVM implementation did not ensure

that the host CR4 control register value remained unchanged across VM
entries on the same virtual CPU. A local, unprivileged user could use this
flaw to cause denial of service on the system. (CVE-2014-3690, Moderate)

• A flaw was found in the way Linux kernel's Transparent Huge Pages (THP)

implementation handled non-huge page migration. A local, unprivileged user
could use this flaw to crash the kernel by migrating transparent hugepages.
(CVE-2014-3940, Moderate)

• An out-of-bounds memory access flaw was found in the syscall tracing

functionality of the Linux kernel's perf subsystem. A local, unprivileged
user could use this flaw to crash the system. (CVE-2014-7825, Moderate)

• An out-of-bounds memory access flaw was found in the syscall tracing

functionality of the Linux kernel's ftrace subsystem. On a system with
ftrace syscall tracing enabled, a local, unprivileged user could use this
flaw to crash the system, or escalate their privileges. (CVE-2014-7826,
Moderate)

• A race condition flaw was found in the Linux kernel's ext4 file system

implementation that allowed a local, unprivileged user to crash the system
by simultaneously writing to a file and toggling the O_DIRECT flag using
fcntl(F_SETFL) on that file. (CVE-2014-8086, Moderate)

• A flaw was found in the way the Linux kernel's netfilter subsystem

handled generic protocol tracking. As demonstrated in the Stream Control
Transmission Protocol (SCTP) case, a remote attacker could use this flaw to
bypass intended iptables rule restrictions when the associated connection
tracking module was not loaded on the system. (CVE-2014-8160, Moderate)

• It was found that due to excessive files_lock locking, a soft lockup

could be triggered in the Linux kernel when performing asynchronous I/O
operations. A local, unprivileged user could use this flaw to crash the
system. (CVE-2014-8172, Moderate)

• A NULL pointer dereference flaw was found in the way the Linux kernel's

madvise MADV_WILLNEED functionality handled page table locking. A local,
unprivileged user could use this flaw to crash the system. (CVE-2014-8173,
Moderate)

• An information leak flaw was found in the Linux kernel's IEEE 802.11

wireless networking implementation. When software encryption was used, a
remote attacker could use this flaw to leak up to 8 bytes of plaintext.
(CVE-2014-8709, Low)

• A stack-based buffer overflow flaw was found in the TechnoTrend/Hauppauge

DEC USB device driver. A local user with write access to the corresponding
device could use this flaw to crash the kernel or, potentially, elevate
their privileges on the system. (CVE-2014-8884, Low)

Red Hat would like to thank Eric Windisch of the Docker project for
reporting CVE-2015-0274, Andy Lutomirski for reporting CVE-2014-3690, and
Robert Święcki for reporting CVE-2014-7825 and CVE-2014-7826.

This update also fixes several hundred bugs and adds numerous enhancements.
Refer to the Red Hat Enterprise Linux 7.1 Release Notes for information on
the most significant of these changes, and the following Knowledgebase
article for further information: https://access.redhat.com/articles/1352803

All Red Hat Enterprise Linux 7 users are advised to install these updated
packages, which correct these issues and add these enhancements. The system
must be rebooted for this update to take effect.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.3 x86_64
• Red Hat Enterprise Linux Server - AUS 7.7 x86_64
• Red Hat Enterprise Linux Server - AUS 7.4 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.7 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.6 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.5 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.4 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.3 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.7 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.5 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.4 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.3 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux Server from RHUI 7 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.7 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.6 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.5 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.4 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.3 x86_64
• Red Hat Enterprise Linux Server - AUS 7.6 x86_64
• Red Hat Enterprise Linux Server - AUS 7.3 x86_64
• Red Hat Enterprise Linux Server - TUS 7.7 x86_64
• Red Hat Enterprise Linux Server - TUS 7.6 x86_64
• Red Hat Enterprise Linux Server - TUS 7.3 x86_64
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.7 x86_64
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.6 x86_64
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.4 x86_64
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.3 x86_64

Fixes

• BZ - 839966 - Trigger RHEL7 crash in guest domU, host don't generate core file
• BZ - 915335 - RFE: Multiple virtio-rng devices support
• BZ - 968147 - enable online multiple hot-added CPUs cause RHEL7.0 guest hang(soft lockup)
• BZ - 1043379 - guest screen fail to return back to the originally screen after resume from S3(still black screen)
• BZ - 1050834 - lockdep warning in flush_work() when hotunplugging a virtio-scsi disk (scsi-block + iscsi://)
• BZ - 1058608 - [RFE] btrfs-progs: btrfs resize doesn't support T/P/E suffix
• BZ - 1065474 - Size of external origin needs to be aligned with thin pool chunk size
• BZ - 1067126 - Virt-manager doesn't configure bridge for VM
• BZ - 1068627 - implement lazy save/restore of debug registers
• BZ - 1071340 - FCoE target: kernel panic when initiator connects to target
• BZ - 1074747 - kvm unit test "realmode" fails
• BZ - 1078775 - During query cpuinfo during guest boot from ipxe repeatedly in AMD hosts, vm repeatedly reboot.
• BZ - 1079841 - kvm unit test "debug" fails
• BZ - 1080894 - dm-cache: crash on creating cache
• BZ - 1083860 - kernel panic when virtscsi_init fails
• BZ - 1083969 - libguestfs-test-tool hangs when the guest is boot with -cpu host
• BZ - 1086058 - fail to boot L2 guest on wildcatpass Haswell host
• BZ - 1088784 - qemu ' KVM internal error. Suberror: 1' when query cpu frequently during pxe boot in Intel "Q95xx" host
• BZ - 1091818 - Windows guest booting failed with apicv and hv_vapic
• BZ - 1095099 - RHEL7.0 guest hang during kdump with qxl shared irq
• BZ - 1098643 - sync with latest upstream dm-thin provisioning improvements and fixes (through 3.15)
• BZ - 1102641 - BUG: It is not possible to communicate between local program and local ipv6 address when at least one 'netlabelctl unlbl' rule is added
• BZ - 1104097 - CVE-2014-3940 Kernel: missing check during hugepage migration
• BZ - 1115201 - [xfs] can't create inodes in newly added space after xfs_growfs
• BZ - 1117542 - Support for movntdq
• BZ - 1119662 - BUG: NetLabel lead to kernel panic on some SELinux levels
• BZ - 1120850 - unable recover NFSv3 locks NLM_DENIED_NOLOCK
• BZ - 1124880 - [fuse] java.io.FileNotFoundException (FNF) during time period with unrecovered disk errors
• BZ - 1127218 - Include fix commit daba287b299ec7a ("ipv4: fix DO and PROBE pmtu mode regarding local fragmentation with UFO/CORK")
• BZ - 1131552 - Solarflare devices do not provide PCIe ACS support, limiting device assignment use case due to IOMMU grouping
• BZ - 1141399 - Device 'vfio-pci' could not be initialized when passing through Intel 82599
• BZ - 1151353 - CVE-2014-8086 Kernel: fs: ext4 race condition
• BZ - 1153322 - CVE-2014-3690 kernel: kvm: vmx: invalid host cr4 handling across vm entries
• BZ - 1161565 - CVE-2014-7825 CVE-2014-7826 kernel: insufficient syscall number validation in perf and ftrace subsystems
• BZ - 1164266 - CVE-2014-8884 kernel: usb: buffer overflow in ttusb-dec
• BZ - 1173580 - CVE-2014-8709 kernel: net: mac80211: plain text information leak
• BZ - 1182059 - CVE-2014-8160 kernel: iptables restriction bypass if a protocol handler kernel module not loaded
• BZ - 1195248 - CVE-2015-0274 kernel: xfs: replacing remote attributes memory corruption
• BZ - 1198457 - CVE-2014-8173 kernel: NULL pointer dereference in madvise(MADV_WILLNEED) support
• BZ - 1198503 - CVE-2014-8172 kernel: soft lockup on aio

CVEs

• CVE-2014-3940
• CVE-2014-7826
• CVE-2014-7825
• CVE-2014-8160
• CVE-2014-3690
• CVE-2014-8709
• CVE-2014-8086
• CVE-2014-8884
• CVE-2014-8172
• CVE-2015-0274
• CVE-2014-8173

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/articles/1352803