Red Hat: 2015:1564-01: kernel-rt: Moderate Advisory

    Date05 Aug 2015
    CategoryRed Hat
    Posted ByAnthony Pell
    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. [More...]
                       Red Hat Security Advisory
    Synopsis:          Moderate: kernel-rt security, bug fix, and enhancement update
    Advisory ID:       RHSA-2015:1564-01
    Product:           Red Hat Enterprise MRG for RHEL-6
    Advisory URL:
    Issue date:        2015-08-05
    CVE Names:         CVE-2014-9715 CVE-2015-2922 CVE-2015-3636 
    1. Summary:
    Updated kernel-rt packages that fix three security issues, several bugs,
    and add various enhancements are now available for Red Hat Enterprise MRG
    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.
    2. Relevant releases/architectures:
    MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64
    3. 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,
    * 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
    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
    * module: Call module notifier on failure after complete_formation()
    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.
    * 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.
    4. 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:
    5. Bugs fixed (
    1203712 - CVE-2015-2922 kernel: denial of service (DoS) attack against IPv6 network stacks due to improper handling of Router Advertisements.
    1208684 - CVE-2014-9715 kernel: netfilter connection tracking extensions denial of service
    1218074 - CVE-2015-3636 kernel: ping sockets: use-after-free leading to local privilege escalation
    1230403 - RFE: update the 3.10 kernel-rt sources
    6. Package List:
    MRG Realtime for RHEL 6 Server v.2:
    These packages are GPG signed by Red Hat for security.  Our key and
    details on how to verify the signature are available from
    7. References:
    8. Contact:
    The Red Hat security contact is . More contact
    details at
    Copyright 2015 Red Hat, Inc.
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