Issued:
2015-08-12
Updated:
2015-09-15

RHSA-2015:1788 - Security Advisory

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.

  • A flaw was found in the kernel's implementation of the Berkeley Packet
    Filter (BPF). A local attacker could craft BPF code to crash the system by
    creating a situation in which the JIT compiler would fail to correctly
    optimize the JIT image on the last pass. This would lead to the CPU
    executing instructions that were not part of the JIT code. (CVE-2015-4700,
    Important)
  • 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 Daniel Borkmann for reporting CVE-2015-4700,
and 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.

The kernel-rt packages have been upgraded to version 3.10.0-229.13.1, which
provides a number of bug fixes and enhancements over the previous version,
including:

  • Fix regression in scsi_send_eh_cmnd()
  • boot hangs at "Console: switching to colour dummy device 80x25"
  • Update tcp stack to 3.17 kernel
  • Missing some code from patch "(...) Fix VGA switcheroo problem related to
    hotplug"
  • ksoftirqd high CPU usage due to stray tasklet from ioatdma driver
  • During Live Partition Mobility (LPM) testing, RHEL 7.1 LPARs will crash
    in kmem_cache_alloc

(BZ#1253809)

This update also fixes the following bug:

  • The hwlat_detector.ko module samples the clock and records any intervals
    between reads that exceed a specified threshold. However, the module
    previously tracked the maximum interval seen for the "inner" interval but
    did not record when the "outer" interval was greater. A patch has been
    applied to fix this bug, and hwlat_detector.ko now correctly records if the
    outer interval is the maximal interval encountered during the run.
    (BZ#1252365)

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

  • Red Hat Enterprise Linux for Real Time 7 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 - 1233615 - CVE-2015-4700 kernel: Crafted BPF filters may crash kernel during JIT optimisation
  • BZ - 1239029 - CVE-2015-5366 CVE-2015-5364 kernel: net: incorrect processing of checksums in UDP implementation
  • BZ - 1245658 - CVE-2015-1333 kernel: denial of service due to memory leak in add_key()
  • BZ - 1253809 - kernel-rt: update to the RHEL7.1.z batch 5 source tree

CVEs

References

Red Hat Enterprise Linux for Real Time 7

SRPM
kernel-rt-3.10.0-229.14.1.rt56.141.13.el7_1.src.rpm SHA-256: 499701a66d21dcf886522618f31c22843260d47cea73b072081b70436df39680
x86_64
kernel-rt-3.10.0-229.14.1.rt56.141.13.el7_1.x86_64.rpm SHA-256: 11002b0f30a9df9bc906687a1fafd96aa2693b3d103f47f002e9448abfcad394
kernel-rt-debug-3.10.0-229.14.1.rt56.141.13.el7_1.x86_64.rpm SHA-256: 9d8e0a2a98b48b7724a12cd22e69d3cd07cbcdde0541bc2356acfc623a47b98b
kernel-rt-debug-debuginfo-3.10.0-229.14.1.rt56.141.13.el7_1.x86_64.rpm SHA-256: e5ff2a28a3c8899de17b8eabffc8f9f723726f2ff06d15af6e30ba7a8ace3631
kernel-rt-debug-devel-3.10.0-229.14.1.rt56.141.13.el7_1.x86_64.rpm SHA-256: 5cd24ee486f3331339a7506aebae264902369cb72b177a446db91ea4c35f0a90
kernel-rt-debuginfo-3.10.0-229.14.1.rt56.141.13.el7_1.x86_64.rpm SHA-256: fd5486122a8d1c55b69d8a9db9e434de822da2d42700a52fb273a4dadf6ed7fd
kernel-rt-debuginfo-common-x86_64-3.10.0-229.14.1.rt56.141.13.el7_1.x86_64.rpm SHA-256: b383ea068c89b77ea20dc6d531b38bc53c1d04b2ee148f46e00e02cc4fd41915
kernel-rt-devel-3.10.0-229.14.1.rt56.141.13.el7_1.x86_64.rpm SHA-256: 0b99fdf69cf3883d1b26683293995c359a7df9822399414087ca365f6002586d
kernel-rt-doc-3.10.0-229.14.1.rt56.141.13.el7_1.noarch.rpm SHA-256: 42e13ae69e168c185c020481e5fb8582aa942df12512b616ca8db7f07ee7dfc2
kernel-rt-trace-3.10.0-229.14.1.rt56.141.13.el7_1.x86_64.rpm SHA-256: fafe95b5710709fb4a6251e107121785c0795ed9a75cee2546656a037e62d26b
kernel-rt-trace-debuginfo-3.10.0-229.14.1.rt56.141.13.el7_1.x86_64.rpm SHA-256: e762cf5044c373b3ef5a7b417778a93493be9e7719caa637521bc9ee61516bae
kernel-rt-trace-devel-3.10.0-229.14.1.rt56.141.13.el7_1.x86_64.rpm SHA-256: e3f337cff476e6d918ebfce51386264c8194c804f87e1316065ce0a0c3a91a05

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.