Synopsis

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

Type/Severity

Security Advisory: Important

Topic

Updated kernel-rt packages that fix multiple security issues, several bugs,
and add various enhancements are now available for Red Hat Enterprise
Linux 7.

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

• Two flaws were found in the way the Linux kernel's networking
  implementation handled UDP packets with incorrect checksum values. A remote
  attacker could potentially use these flaws to trigger an infinite loop in
  the kernel, resulting in a denial of service on the system, or cause a
  denial of service in applications using the edge triggered epoll
  functionality. (CVE-2015-5364, CVE-2015-5366, Important)
  
• A flaw was found in the way the Linux kernel's ext4 file system handled
  the "page size > block size" condition when the fallocate zero range
  functionality was used. A local attacker could use this flaw to crash the
  system. (CVE-2015-0275, Moderate)
  
• It was found that the Linux kernel's keyring implementation would leak
  memory when adding a key to a keyring via the add_key() function. A local
  attacker could use this flaw to exhaust all available memory on the system.
  (CVE-2015-1333, Moderate)
  
• A race condition flaw was found in the way the Linux kernel's SCTP
  implementation handled Address Configuration lists when performing Address
  Configuration Change (ASCONF). A local attacker could use this flaw to
  crash the system via a race condition triggered by setting certain ASCONF
  options on a socket. (CVE-2015-3212, Moderate)
  
• An information leak flaw was found in the way the Linux kernel's Virtual
  Dynamic Shared Object (vDSO) implementation performed address
  randomization. A local, unprivileged user could use this flaw to leak
  kernel memory addresses to user-space. (CVE-2014-9585, Low)
  

Red Hat would like to thank Canonical for reporting the CVE-2015-1333
issue. The CVE-2015-0275 issue was discovered by Xiong Zhou of Red Hat, and
the CVE-2015-3212 issue was discovered by Ji Jianwen of Red Hat
Engineering.

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:

• Fix regression in scsi_send_eh_cmnd()
  
• boot hangs at "Console: switching to colour dummy device 80x25"
  
• Update tcp stack to 3.17 kernel
  
• ksoftirqd high CPU usage due to stray tasklet from ioatdma driver
  

(BZ#1245345)

This update also fixes the following bugs:

• The configuration option CONFIG_RTC_HCTOSYS was disabled on the realtime
  kernel causing the RTC clock to be adjusted with the UTC time even if the
  system is configured to set the RTC to the local time. By enabling the
  CONFIG_RTC_HCTOSYS configuration option, when the system is configured to
  use local time, RTC will correctly update with the local time and not try
  to use another timezone. (BZ#1248047)
  
• In the realtime kernel, if a rt_mutex was taken while in interrupt
  context the normal priority inheritance protocol would falsely identify a
  deadlock and trigger a kernel crash. The patch that added the rt_mutex in
  this interrupt context was reverted. (BZ#1250649)
  

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 - 1181054 - CVE-2014-9585 kernel: ASLR bruteforce possible for vdso library
• BZ - 1193907 - CVE-2015-0275 kernel: fs: ext4: fallocate zero range page size > block size BUG()
• BZ - 1226442 - CVE-2015-3212 kernel: SCTP race condition allows list corruption and panic from userlevel
• BZ - 1239029 - CVE-2015-5366 CVE-2015-5364 kernel: net: incorrect processing of checksums in UDP implementation
• BZ - 1245345 - RFE: update the MRG 2.5 3.10 kernel-rt sources
• BZ - 1245658 - CVE-2015-1333 kernel: denial of service due to memory leak in add_key()

CVEs

• CVE-2014-9585
• CVE-2015-5364
• CVE-2015-5366
• CVE-2015-3212
• CVE-2015-1333
• CVE-2015-0275

References

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

MRG Realtime 2

SRPM
kernel-rt-3.10.0-229.rt56.161.el6rt.src.rpm	SHA-256: 4385d70c00c597d4f1a864cbb291a6dc06e1f85c6112ac814b8ee629365cfbec
x86_64
kernel-rt-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: 5b2249a48816aeacf94ce887642922db910f5b354051b3b0d6acc7103247ce54
kernel-rt-debug-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: 2e603185ac8a1554abd825502c68591c5b3512ac79a76c466a47c2a27e24f535
kernel-rt-debug-debuginfo-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: ca9b075ab65e42d081c5be525ad7ef966aa793f829a9b0cabe6b62156e5243ed
kernel-rt-debug-devel-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: 4e9280903325e3a23eccd6370b07130af79558402a7833579417f90580a94cf4
kernel-rt-debuginfo-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: 3483141922d2ed0d91c9751532a73205442566b2952eb642ef0c3f6848d68e1f
kernel-rt-debuginfo-common-x86_64-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: d7e1c92d9dcc33b1ab45a02694cf19ec698f73806c68758260c25c504faa7ce8
kernel-rt-devel-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: 4bc3d7f0fbdc4ce5d04248b5494149a5fb28e6955f014763eceb9300632c7407
kernel-rt-doc-3.10.0-229.rt56.161.el6rt.noarch.rpm	SHA-256: bdb0492c6069a2b2e975cc4b7e9e5163c486fb28af3b477c3270e5029bcfb0b5
kernel-rt-firmware-3.10.0-229.rt56.161.el6rt.noarch.rpm	SHA-256: eac4f2cf26a00aca7dbfa5d0ffda9ed75ba196d0b0153edeb814f51a17550ad5
kernel-rt-trace-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: d8e6a7e9667e2496b25add567197214ecd465795fc2a0115ed40e45fb32644af
kernel-rt-trace-debuginfo-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: cfaa94decc60b32ab4c7f3cd68019cd2c85c5c8b3e79efda4742d8ba03478da3
kernel-rt-trace-devel-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: 02660e6bf5ea2bb031331123cca2866f6a9bdb64e14d939b73b0b8128284efb8
kernel-rt-vanilla-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: fdf89e466d06b6b8be3ebc526f79faff5e5721fc6caf9b2384515cefeb660c46
kernel-rt-vanilla-debuginfo-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: 8b3b0816129056a84c386de6f616c530db06e8776968081ed28f8848aed1d6ec
kernel-rt-vanilla-devel-3.10.0-229.rt56.161.el6rt.x86_64.rpm	SHA-256: 0920886ed649c43ebd3db3846e402c7c7719dfa33239c0b5e3c778b495e290c0