Synopsis

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

Type/Severity

Security Advisory: Moderate

Topic

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

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

• A flaw was found in the way the Linux kernel's VFS subsystem handled file
  system locks. A local, unprivileged user could use this flaw to trigger a
  deadlock in the kernel, causing a denial of service on the system.
  (CVE-2014-8559, Moderate)
  
• A buffer overflow flaw was found in the way the Linux kernel's virtio-net
  subsystem handled certain fraglists when the GRO (Generic Receive Offload)
  functionality was enabled in a bridged network configuration. An attacker
  on the local network could potentially use this flaw to crash the system,
  or, although unlikely, elevate their privileges on the system.
  (CVE-2015-5156, Moderate)
  

The CVE-2015-5156 issue was discovered by Jason Wang of Red Hat.

The kernel-rt packages have been upgraded to version 3.10.0-229.20.1, which
provides a number of bug fixes and enhancements over the previous version,
including:

• Unexpected completion is detected on Intel Ethernet x540
  
• Divide by zero error in intel_pstate_timer_func() [ inline s64
  div_s64_rem() ]
  
• NFS Recover from stateid-type error on SETATTR
  
• pNFS RHEL 7.1 Data Server connection remains after umount due to lseg
  refcount leak
  
• Race during NFS v4.0 recovery and standard IO.
  
• Fix ip6t_SYNPROXY for namespaces and connection delay
  
• synproxy window size and sequence number behaviour causes long connection
  delay
  
• Crash in kmem_cache_alloc() during disk stress testing (using ipr)
  
• xfs: sync/backport to upstream v4.1
  
• iscsi_session recovery_tmo revert back to default when a path becomes
  active
  
• read from MD raid1 can fail if read from resync target fails
  
• backport scsi-mq
  
• unable to handle kernel paging request at 0000000000237037 [zswap]
  

(BZ#1266915)

All kernel-rt users are advised to upgrade to these updated packages, which
correct these issues and add this enhancement. 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 for Real Time 7 x86_64

Fixes

• BZ - 1159313 - CVE-2014-8559 kernel: fs: deadlock due to incorrect usage of rename_lock
• BZ - 1243852 - CVE-2015-5156 kernel: buffer overflow with fraglist larger than MAX_SKB_FRAGS + 2 in virtio-net
• BZ - 1266915 - kernel-rt: update to the RHEL7.1.z batch 6 source tree

CVEs

• CVE-2014-8559
• CVE-2015-5156

References

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

Red Hat Enterprise Linux for Real Time 7

SRPM
kernel-rt-3.10.0-229.20.1.rt56.141.14.el7_1.src.rpm	SHA-256: fed2776c7c41787a60e9aa0532df5f48f30866598b5c2f448877d3ff72d5a02a
x86_64
kernel-rt-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm	SHA-256: c23e1bdd8580357900ca93c7dbc52882e32ccd4aa336f080dc90b79de2f542f1
kernel-rt-debug-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm	SHA-256: ea0e893a1acde4a88f5202a69b5e1cdb5dad3ce52f54cca34bf29afb6e0fdeff
kernel-rt-debug-debuginfo-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm	SHA-256: 563064a853c4eecce96d28d3d2b0ec884f71ed6e14f2ebaac4a86a7ceaf0501e
kernel-rt-debug-devel-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm	SHA-256: 8c3ad65d5b1b07e3f114af89d112bf7dc9e8080a9621083d65391f2442695aa7
kernel-rt-debuginfo-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm	SHA-256: 1e4db1bb89d2cf3f1e20098e8902149e66aad4cc12121e4a462b64a5e1589286
kernel-rt-debuginfo-common-x86_64-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm	SHA-256: c04358d96834450fd76484e72be40b3ecb50c69f82d2d0bae2e413d4f9ba427f
kernel-rt-devel-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm	SHA-256: cc2a9d85f58c08073b64166383658b1a4f7c33bdf653090ecebbce0539e8e734
kernel-rt-doc-3.10.0-229.20.1.rt56.141.14.el7_1.noarch.rpm	SHA-256: c7f7e122af8a51ffbe7d1907497e65ce446ae1ab00c804cc14bf8a40ca2a3618
kernel-rt-trace-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm	SHA-256: dbfec0b09353c7f68743d5573368d16217ba2e7d67b6a8ef6d6691d1200fd57d
kernel-rt-trace-debuginfo-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm	SHA-256: ec8bfb869c6b4c016611a9099e32ffb3668347e3aaab760ec99460d86b472b8d
kernel-rt-trace-devel-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm	SHA-256: 94f51005410d4223c41bab0e3871faf99b0a7733c46d8148e01870910e1f2518