6.9 - RHSA-2014:1392

Problem Description:

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 6. This is the sixth 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64 Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

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

* A NULL pointer dereference flaw was found in the way the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation handled simultaneous connections between the same hosts. A remote attacker could use this flaw to crash the system. (CVE-2014-5077, Important)

* An integer overflow flaw was found in the way the Linux kernel's Frame Buffer device implementation mapped kernel memory to user space via the mmap syscall. A local user able to access a frame buffer device file (/dev/fb*) could possibly use this flaw to escalate their privileges on the system. (CVE-2013-2596, Important)

* A flaw was found in the way the ipc_rcu_putref() function in the Linux kernel's IPC implementation handled reference counter decrementing. A local, unprivileged user could use this flaw to trigger an Out of Memory (OOM) condition and, potentially, crash the system. (CVE-2013-4483, Moderate)

* It was found that the permission checks performed by the Linux kernel when a netlink message was received were not sufficient. A local, unprivileged user could potentially bypass these restrictions by passing a netlink socket as stdout or stderr to a more privileged process and altering the output of this process. (CVE-2014-0181, Moderate)

* It was found that the try_to_unmap_cluster() function in the Linux kernel's Memory Managment subsystem did not properly handle page locking in certain cases, which could potentially trigger the BUG_ON() macro in the mlock_vma_page() function. A local, unprivileged user could use this flaw to crash the system. (CVE-2014-3122, Moderate)

* A flaw was found in the way the Linux kernel's kvm_iommu_map_pages() function handled IOMMU mapping failures. A privileged user in a guest with an assigned host device could use this flaw to crash the host. (CVE-2014-3601, Moderate)

* Multiple use-after-free flaws were found in the way the Linux kernel's Advanced Linux Sound Architecture (ALSA) implementation handled user controls. A local, privileged user could use either of these flaws to crash the system. (CVE-2014-4653, CVE-2014-4654, CVE-2014-4655, Moderate)

* A flaw was found in the way the Linux kernel's VFS subsystem handled reference counting when performing unmount operations on symbolic links. A local, unprivileged user could use this flaw to exhaust all available memory on the system or, potentially, trigger a use-after-free error, resulting in a system crash or privilege escalation. (CVE-2014-5045, Moderate)

* An integer overflow flaw was found in the way the lzo1x_decompress_safe() function of the Linux kernel's LZO implementation processed Literal Runs. A local attacker could, in extremely rare cases, use this flaw to crash the system or, potentially, escalate their privileges on the system. (CVE-2014-4608, Low)

Red Hat would like to thank Vladimir Davydov of Parallels for reporting CVE-2013-4483, Jack Morgenstein of Mellanox for reporting CVE-2014-3601, Vasily Averin of Parallels for reporting CVE-2014-5045, and Don A. Bailey from Lab Mouse Security for reporting CVE-2014-4608. The security impact of the CVE-2014-3601 issue was discovered by Michael Tsirkin of Red Hat.

This update also fixes several hundred bugs and adds numerous enhancements. Refer to the Red Hat Enterprise Linux 6.6 Release Notes for information on the most significant of these changes, and the Technical Notes for further information, both linked to in the References.

All Red Hat Enterprise Linux 6 users are advised to install these updated packages, which correct these issues, and fix the bugs and add the enhancements noted in the Red Hat Enterprise Linux 6.6 Release Notes and Technical Notes. The system must be rebooted for this update to take effect.

4. Solution:

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

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/articles/11258

To install kernel packages manually, use "rpm -ivh [package]". Do not use "rpm -Uvh" as that will remove the running kernel binaries from your system. You may use "rpm -e" to remove old kernels after determining that the new kernel functions properly on your system.

5. Bugs fixed (https://bugzilla.redhat.com/):

739866 - checkpolicy cannot parse /selinux/policy on ppc64 and s390x 786463 - nfs mount hangs when kerberos ticket expires 889471 - [Btrfs] BUG: unable to handle kernel NULL pointer dereference at (null) btrfs_get_sb should return error when open_ctree failed 915862 - The sync mount option does not work for NFSv4 mounts in RHEL6 997651 - possible recursive locking detected 998024 - nfsd sometimes grants delegations too soon following conflicting open requests 1010882 - kvm: backport "Improve create VCPU parameter" 1024854 - CVE-2013-4483 kernel: ipc: ipc_rcu_putref refcount races 1027480 - alb_send_learning_packets using an obsolete EtherType 1030411 - resizing thin-snapshot with external origin should return zeros behind origin's end 1031488 - Restore the mask bit correctly in eoi_ioapic_irq() 1034490 - CVE-2013-2596 kernel: integer overflow in fb_mmap 1036972 - use after free in new nfsd DRC code 1044438 - cifs: Unable to append to an existing file in cache=none mode. 1059496 - KVM: x86 emulator: Implement jmp far opcode ff/5 1063836 - kvm: 23090: cpu0 unhandled wrmsr 0x391 data 2000000f 1065304 - kernel/sched: incorrect setup of sched_group->cpu_power for NUMA systems 1069028 - ixgbevf prematurely strips VLAN tags 1072373 - Along with the increase of vCPUs in guest, and guest OS will spend more time to boot up in specified machine. 1077463 - gfs2: quotas not refreshed in gfs2_adjust_quota 1090423 - Data integrity issue on rebuilding RAID 6 with 100MB resync speed 1093076 - CVE-2014-3122 Kernel: mm: try_to_unmap_cluster() should lock_page() before mlocking 1094265 - CVE-2014-0181 kernel: net: insufficient permision checks of netlink messages 1095627 - missing vhost schedule causing thread starvation 1100523 - ext4 filesystem option 'max_batch_time' actually displays 'min_batch_time' in /proc/mounts 1113409 - CVE-2014-4653 Kernel: ALSA: control: do not access controls outside of protected regions 1113445 - CVE-2014-4654 CVE-2014-4655 Kernel: ALSA: control: use-after-free in replacing user controls 1113899 - CVE-2014-4608 kernel: lzo1x_decompress_safe() integer overflow 1118123 - [Hyper-V][REHL 6.6] fcopy large file from host to guest failed 1122472 - CVE-2014-5045 kernel: vfs: refcount issues during unmount on symlink 1122982 - CVE-2014-5077 Kernel: net: SCTP: fix a NULL pointer dereference during INIT collisions 1124351 - raid1 Data corruption after recovery with bitmap 1127231 - dmeventd hanging while handling lost leg in RAID1 LV 1131951 - CVE-2014-3601 kernel: kvm: invalid parameter passing in kvm_iommu_map_pages()