Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.5.

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.

Description

The kernel-rt package contain the Linux kernel, the core of any Linux
operating system.

This update provides a build of the kernel-rt package for Red Hat
Enterprise MRG 2.5 that is layered on Red Hat Enterprise Linux 6, and
provides a number of bug fixes including:

• [netdrv] ixgbevf: fix spoofed packets with random MAC and use ether_addr_copy instead of memcpy
  
• [mm] mmu_notifier: fix memory corruption
  
• [mm] hugetlbfs: optimize when NUMA=n
  
• [mm] optimize put_mems_allowed() usage
  
• [x86] mm: suitable memory should go to ZONE_MOVABLE
  
• [fs] xfs: fix splice/direct-IO deadlock
  
• [acpi] tables: Add acpi_subtable_proc to ACPI table parsers
  
• [acpi] table: Add new function to get table entries
  
• [net] ipv6: Nonlocal bind
  
• [net] ipv4: bind ip_nonlocal_bind to current netns
  

(BZ#1332298)

Security Fix(es):

• A flaw was found in the way certain interfaces of the Linux kernel's
  Infiniband subsystem used write() as bi-directional ioctl() replacement,
  which could lead to insufficient memory security checks when being invoked
  using the splice() system call. A local unprivileged user on a system
  with either Infiniband hardware present or RDMA Userspace Connection
  Manager Access module explicitly loaded, could use this flaw to escalate
  their privileges on the system. (CVE-2016-4565, Important)
  
• A race condition flaw was found in the way the Linux kernel's SCTP
  implementation handled sctp_accept() during the processing of heartbeat
  timeout events. A remote attacker could use this flaw to prevent further
  connections to be accepted by the SCTP server running on the system,
  resulting in a denial of service. (CVE-2015-8767, Moderate)
  
• A flaw was found in the way the realtime kernel processed specially
  crafted ICMP echo requests. A remote attacker could use this flaw to
  trigger a sysrql function based on values in the ICMP packet, allowing them
  to remotely restart the system. Note that this feature is not enabled by
  default and requires elevated privileges to be configured. (CVE-2016-3707,
  Moderate)
  

Red Hat would like to thank Jann Horn for reporting CVE-2016-4565.

Bug Fix(es):

• An oops can occur in the hpsa driver while submitting ioaccel2 commands
  when the phys_disk pointer is NULL (in hpsa_scsi_ioaccel_raid_map).
  Configuration changes during I/O operations could set the phys_disk
  pointer to NULL. In this case, send the command down the RAID path for
  correct processing, avoiding the oops. (BZ#1334260)
  
• A faulty code merge left an extra spin_lock operation in the function
  fscache_invalidate_write(). The code has been correctly updated to remove
  this extra lock operation, which avoids a potential deadlock situation
  when looping through cache pages. (BZ#1327730)

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.

Affected Products

• MRG Realtime 2 x86_64

Fixes

• BZ - 1297389 - CVE-2015-8767 kernel: SCTP denial of service during timeout
• BZ - 1310570 - CVE-2016-4565 kernel: infiniband: Unprivileged process can overwrite kernel memory using rdma_ucm.ko
• BZ - 1327484 - CVE-2016-3707 kernel-rt: Sending SysRq command via ICMP echo request
• BZ - 1327730 - deadlock in fscache code (merge error) [mrg]
• BZ - 1332298 - update the MRG 2.5.z 3.10 kernel-rt sources

CVEs

• CVE-2015-8767
• CVE-2016-3707
• CVE-2016-4565

References

• http://www.redhat.com/security/updates/classification/#normal

MRG Realtime 2

SRPM
kernel-rt-3.10.0-327.rt56.190.el6rt.src.rpm	SHA-256: 7e4d2b276dd758c4500e966c9832c55dc44bb0776047acf97240e143e122b22e
x86_64
kernel-rt-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: 6463ca3b1e0c455d079d93023d64c54b94aa02cedb297bcee6cc47c1179604d2
kernel-rt-debug-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: 54b1eadb10193af400d05e550d3473d035f2cf3c04bd44f3057ba3ad766ae528
kernel-rt-debug-debuginfo-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: 0334006a711d926fd07a54473fc8f442f20123599510722e07efa319a1df9f80
kernel-rt-debug-devel-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: 411deedcc8ed7228812bc7a4f4e1ec86a637533b72122cb7d24888a31057b68b
kernel-rt-debuginfo-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: 50dd8a3d877078a3013fcd6dffe8de5441cdd8e4f0eee49bdc0fd3fb46178811
kernel-rt-debuginfo-common-x86_64-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: f03f266cc8d7fb43635e81093773290cbcf822cb975bc2f82b0c82f02ec25c44
kernel-rt-devel-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: 39f7a70ae2246f12933bc8b44ee5c05a00edf66cb2f214ed9c7b73722a1543ab
kernel-rt-doc-3.10.0-327.rt56.190.el6rt.noarch.rpm	SHA-256: d11eb2071756bb313adcb4de9b99c918fb8f5acd700b4eff81627bbd65a1fc4c
kernel-rt-firmware-3.10.0-327.rt56.190.el6rt.noarch.rpm	SHA-256: 58483d09b2d52f3936bd0e46cd0ab595d645369d65aaf90fc37b25fe0d43ce9e
kernel-rt-trace-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: 573691624a1150dab71786556d4001d90a9b8e04f1bee40730040420d7bb783c
kernel-rt-trace-debuginfo-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: 61ed93bace3117a06a892e05c387c79d8d28650ea3530f5063bfed18022457fa
kernel-rt-trace-devel-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: cf54fcb23d83a1d2186aa31d73c1a380598679b24952436c2e89bf5d9499637c
kernel-rt-vanilla-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: 7171adac2b65fb1dba8f99c9342c284265399481acb035505de1fc19801eea55
kernel-rt-vanilla-debuginfo-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: e908cbef5acabdf09ec174040ae6f8b7053650e8cafc0156bf89f7c64d2bf9cb
kernel-rt-vanilla-devel-3.10.0-327.rt56.190.el6rt.x86_64.rpm	SHA-256: 4af000b47e285b18e592189af9c8fe888d99359c372fd7f044a3000853477644