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centosCentOS ProjectCESA-2016:1277
HistoryJun 23, 2016 - 11:41 p.m.

kernel, perf, python security update

2016-06-2323:41:38
CentOS Project
lists.centos.org
78

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.002

Percentile

54.9%

CentOS Errata and Security Advisory CESA-2016:1277

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

These updated kernel packages include several security issues and numerous
bug fixes, some of which you can see below. Space precludes documenting
all of these bug fixes in this advisory. To see the complete list of bug
fixes, users are directed to the related Knowledge Article:
https://access.redhat.com/articles/2361921.

Security Fixes:

  • A flaw was found in the way certain interfaces of the Linux kernel’s
    Infiniband subsystem used write() as bi-directional ioctl() replacement,
    which could lead to insufficient memory security checks when being invoked
    using the splice() system call. A local unprivileged user on a system
    with either Infiniband hardware present or RDMA Userspace Connection
    Manager Access module explicitly loaded, could use this flaw to escalate
    their privileges on the system. (CVE-2016-4565, Important)

  • A race condition flaw was found in the way the Linux kernel’s SCTP
    implementation handled sctp_accept() during the processing of heartbeat
    timeout events. A remote attacker could use this flaw to prevent further
    connections to be accepted by the SCTP server running on the system,
    resulting in a denial of service. (CVE-2015-8767, Moderate)

Red Hat would like to thank Jann Horn for reporting CVE-2016-4565.

Bug Fixes:

  • When Small Computer System Interface (SCSI) devices were removed or
    deleted, a system crash could occur due to a race condition between listing
    all SCSI devices and SCSI device removal. The provided patch ensures that
    the starting node for the klist_iter_init_node() function is actually a
    member of the list before using it. As a result, a system crash no longer
    occurs in the described scenario. (BZ#1333403)

  • This update offers a reworked series of patches for the resizable hash
    table (rhashtable) including a number of backported bug fixes and
    enhancements from upstream. (BZ#1328801)

  • Previously, the same value of the mperf Model-Specific Register (MSR)
    read twice in a row could lead to a kernel panic due to the divide-by-zero
    error. The provided patch fixes this bug, and the kernel now handles two
    identical values of mperf gracefully. (BZ#1334438)

  • When a transparent proxy application was running and the number of
    established connections on the computer exceeded one million, unrelated
    processes, such as curl or ssh, were unable to bind to a local IP on the
    box to initiate a connection. The provided patch fixes the cooperation of
    the REUSEADDR/NOREUSEADDR socket option, and thus prevents the local port
    from being exhausted. As a result, the aforementioned bug no longer occurs
    in the described scenario. (BZ#1323960)

  • Previously, the kernel support for non-local bind for the IPv6 protocol
    was incomplete. As a consequence, an attempt to bind a socket to an IPv6
    address that is not assigned to the host could fail. The provided patch
    includes changes in the ip_nonlocal_bind variable, which is now set to
    allow binding to an IPv6 address that is not assigned to the host. As a
    result, Linux servers are now able to bind to non-local IPv6 addresses as
    expected. (BZ#1324502)

  • On some servers with a faster CPU, USB initialization could previously
    lead to a kernel hang during boot. If this inconvenience occurred when
    booting the second kernel during the kdump operation, the kdump service
    failed and the vmcore was lost. The provided upstream patch fixes this bug,
    and the kernel no longer hangs after USB initialization. (BZ#1327581)

  • Previously, when running iperf servers using the mlx4_en module, a kernel
    panic occurred. The underlying source code has been fixed, and the kernel
    panic no longer occurs in the described scenario. (BZ#1327583)

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2016-June/084089.html

Affected packages:
kernel
kernel-abi-whitelists
kernel-debug
kernel-debug-devel
kernel-devel
kernel-doc
kernel-headers
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
perf
python-perf

Upstream details at:
https://access.redhat.com/errata/RHSA-2016:1277

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.002

Percentile

54.9%