Synopsis

Moderate: kernel-rt security, bug fix, and enhancement update

Type/Severity

Security Advisory: Moderate

Topic

Updated kernel-rt packages that fix three security issues, several bugs,
and add various enhancements are now available for Red Hat Enterprise MRG
2.5.

Red Hat Product Security has rated this update as having Moderate 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-rt packages contain the Linux kernel, the core of any Linux
operating system.

• An integer overflow flaw was found in the way the Linux kernel's
  netfilter connection tracking implementation loaded extensions. An attacker
  on a local network could potentially send a sequence of specially crafted
  packets that would initiate the loading of a large number of extensions,
  causing the targeted system in that network to crash. (CVE-2014-9715,
  Moderate)
  
• It was found that the Linux kernel's ping socket implementation did not
  properly handle socket unhashing during spurious disconnects, which could
  lead to a use-after-free flaw. On x86-64 architecture systems, a local user
  able to create ping sockets could use this flaw to crash the system.
  On non-x86-64 architecture systems, a local user able to create ping
  sockets could use this flaw to escalate their privileges on the system.
  (CVE-2015-3636, Moderate)
  
• It was found that the Linux kernel's TCP/IP protocol suite implementation
  for IPv6 allowed the Hop Limit value to be set to a smaller value than the
  default one. An attacker on a local network could use this flaw to prevent
  systems on that network from sending or receiving network packets.
  (CVE-2015-2922, Low)
  

Red Hat would like to thank Nathan Hoad for reporting the CVE-2014-9715
issue.

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 fixes
the following issues:

• drbg: Add stdrng alias and increase priority
  
• seqiv / eseqiv / chainiv: Move IV seeding into init function
  
• ipv4: kABI fix for 0bbf87d backport
  
• ipv4: Convert ipv4.ip_local_port_range to be per netns
  
• libceph: tcp_nodelay support
  
• ipr: Increase default adapter init stage change timeout
  
• fix use-after-free bug in usb_hcd_unlink_urb()
  
• libceph: fix double __remove_osd() problem
  
• ext4: fix data corruption caused by unwritten and delayed extents
  
• sunrpc: Add missing support for RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT
  
• nfs: Fixing lease renewal (Benjamin Coddington)
  
• control hard lockup detection default
  
• Fix print-once on enable
  
• watchdog: update watchdog_thresh properly and watchdog attributes
  atomically
  
• module: Call module notifier on failure after complete_formation()
  

(BZ#1230403)

This update also fixes the following bugs:

• Non-standard usage of the functions write_seqcount_{begin,end}() were
  used in NFSv4, which caused the realtime code to try to sleep while locks
  were held and produced the "scheduling while atomic" messages. The code was
  modified to use the functions __write_seqcount_{begin,end}() that do not
  hold any locks removing the message and allowing correct execution.
  (BZ#1225642)
  
• Dracut in Red Hat Enterprise Linux 6 has a dependency on a module called
  scsi_wait_scan that no longer exists on 3.x kernels. This caused the system
  to display misleading messages at start-up when the obsoleted
  scsi_wait_scan module was not found. To address this issue, MRG Realtime
  provides a dummy scsi_wait_scan module so that the requirements for the
  initramfs created by dracut are met and the boot messages are no longer
  displayed. (BZ#1230403)
  

All kernel-rt users are advised to upgrade to 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

• MRG Realtime 2 x86_64

Fixes

• BZ - 1203712 - CVE-2015-2922 kernel: denial of service (DoS) attack against IPv6 network stacks due to improper handling of Router Advertisements.
• BZ - 1208684 - CVE-2014-9715 kernel: netfilter connection tracking extensions denial of service
• BZ - 1218074 - CVE-2015-3636 kernel: ping sockets: use-after-free leading to local privilege escalation
• BZ - 1230403 - RFE: update the 3.10 kernel-rt sources

CVEs

• CVE-2015-2922
• CVE-2015-3636
• CVE-2014-9715

References

• https://access.redhat.com/security/updates/classification/#moderate

MRG Realtime 2

SRPM
kernel-rt-3.10.0-229.rt56.158.el6rt.src.rpm	SHA-256: 142d6b951b3812efd9f64d2ef6b65f16e5819d8dc4db1d6789f1b8e6a4250f86
x86_64
kernel-rt-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: 3021940207a1817fb4f80a5065a296c37b537d5974cb7c6f8652eaaab99b7dfd
kernel-rt-debug-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: a8a4c60aa0238dd007110b11c35f11a6435a6ee116a7b17f2537e7b99b4d2919
kernel-rt-debug-debuginfo-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: 4667bf5b2096d223fa19be4a4d73c3e3eabd151a4cb498d103a8c63b5a81017b
kernel-rt-debug-devel-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: 4deb3443a1ff0d6f1bb0322ccdf7698c1b392cdaf95aec3bf7be715d232f25aa
kernel-rt-debuginfo-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: 84bccee71c8c3aced6e602f5abf07b4f4cfb5076597a8d3fd0b3ff3f18d0c33d
kernel-rt-debuginfo-common-x86_64-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: 9d7d31d390417b827c78c789ea2f908df0d05ce281fad3d663bcf3aa68e0c988
kernel-rt-devel-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: 4065a2c24af305aede8dc7f445571cd9c4811ed5afc4bc57b8e2c43721760c65
kernel-rt-doc-3.10.0-229.rt56.158.el6rt.noarch.rpm	SHA-256: a301e38b3e1275583908580b9794ee032e3b2423d2307b5b24e6bbb1ef85e859
kernel-rt-firmware-3.10.0-229.rt56.158.el6rt.noarch.rpm	SHA-256: 1d6b5e1bfa9ba44c4a44e5390705c0851e2212621f4c9b8ed441f855b97d83f0
kernel-rt-trace-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: 7c5e1de1f0c73401fddd3c1e493639a417bfd0e8f65aeb0010709c63dbd3da7e
kernel-rt-trace-debuginfo-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: a886f195aaa595deb1c593f84c5019a83e3782d1453dad1a69fd7d635d9623a0
kernel-rt-trace-devel-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: 9c89228e7889ada96f1e217e51d8e04576e1a63c53a04cab20a6059e46231022
kernel-rt-vanilla-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: c98b8b709b43421d2a3fecabca2e7d64f604a6a919fd9ee4017a5a854050296f
kernel-rt-vanilla-debuginfo-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: 891dbf8574b394de906e1403b55c0f7ba96998bd43992e96ec295e9de5476a82
kernel-rt-vanilla-devel-3.10.0-229.rt56.158.el6rt.x86_64.rpm	SHA-256: 7113d571e71b4c2dd2ec89ad3a8d999d9e5698e660384476f1a796843572bfa6